Journal of Threatened Taxa | www.threatenedtaxa.org | 26 February 2026 | 18(2): 28343–28349

 

ISSN 0974-7907 (Online) | ISSN 0974-7893 (Print) 

https://doi.org/10.11609/jott.9679.18.2.28343-28349

#9679 | Received 12 February 2025 | Final received 10 December 2025 | Finally accepted 06 January 2026

 

 

Analysis revealed minuscule DNA sequence data availability for Indian marine macroalgal diversity

 

Digvijay Singh Yadav 1 , Aswin Alichen 2  & Vaibhav A. Mantri 3        

 

1,2,3 Applied Phycology and Biotechnology Division, CSIR- Central Salt and Marine Chemicals Research Institute, Gijubhai Badheka Marg, Bhavnagar, Gujarat 364002, India.

3 Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, Uttar Pradesh 201002, India.

1 digvijaysingh.yadav@gmail.com, 2 aswinalichan12@gmail.com, 3 vaibhav.csmcri@csir.res.in (corresponding author)

 

 

Editor: Ram Chandra Poudel, Nepal Academy of Science and Technology (NAST), Lalitpur, Nepal. Date of publication: 26 February 2026 (online & print)

 

Citation: Yadav, D.S., A. Alichen & V.A. Mantri (2026). Analysis revealed minuscule DNA sequence data availability for sIndian marine macroalgal diversity. Journal of Threatened Taxa 18(2): 28343–28349. https://doi.org/10.11609/jott.9679.18.2.28343-28349

  

Copyright: © Yadav et al. 2026. Creative Commons Attribution 4.0 International License. JoTT allows unrestricted use, reproduction, and distribution of this article in any medium by providing adequate credit to the author(s) and the source of publication.

 

Funding: Funding from Council of Scientific and Industrial Research, New Delhi is gratefully acknowledged.

 

Competing interests: The authors declare no competing interests.

 

Author details: Digvijay Singh Yadav has PhD in Biosciences with expertise in molecular taxonomy and pharmaceutical application of seaweeds. Currently working as a postdoctoral researcher at the CSIR-Central Salt and Marine Chemicals Research Institute (CSMCRI) in India, his work focuses on seaweed-propagule transport, biostimulant application, and large-scale seaweed cultivation along the Indian coast. Aswin Alichen has completed his post graduation and is a young and motivated researcher with strong interest in seaweed biology and seaweed-based climate changes studies. The research work in the current publication was carried out during his dissertation work at CSMCRI, India. Vaibhav A. Mantri is the chief principal scientist at CSMCRI, Dr. Mantri advances year-round Indian seaweed farming through improved cultivation techniques. His research focuses on strain enhancement, artificial seedling protocols to minimize epiphytic infestation, and developing viable farming methods by analyzing environmental determinants.

 

Author contributions: DSY-—investigation, formal analysis, methodology, validation, visualization, data curation, manuscript preparation. AA—investigation, formal analysis, methodology, validation, visualization, data curation. VAM—conceptualization, methodology, project administration, supervision, writing – review & editing, funding acquisition. All authors provided critical feedback and helped shape the research analysis and manuscript.

 

Acknowledgements:  We thank the director, CSIR Central Salt and Marine Chemicals Research Institute, Bhavnagar, for the support and facilities. This manuscript has PRIS registration number 96/2024.

 

 

Abstract: Seaweeds hold immense economic potential due to multifarious applications in pharmaceuticals and everyday products. India’s 11,099 km coastline harbours a rich diversity of seaweeds in the Indian Ocean. Identifying seaweeds based on morphology is challenging due to high phenotypic and reproductive plasticity, so DNA barcoding is often used. This initiative marks the first national effort to compile relevant scientific information on DNA barcoding of Indian marine macroalgae, the current-status of knowledge and the scope for study. Despite decades of molecular research on Indian macroalgae, the resulting sequence data remain scattered across online repositories without systematic integration or quality assessment. The study is a comprehensive analysis of current barcode coverage of Indian seaweeds available on GenBank. With 207 unique sequences, only 11% of total Indian macroalgal diversity has been studied yet. The priority gaps that demonstrate direct benefits such as accurate taxonomic identification, cultivation strain authentication, and assessment of invasive species and surveillance of algal blooms, and indirect benefits like policy support, conservation planning, reference libraries for eDNA, training, and capacity building were identified. We consider that DNA barcoding at the national level would not only help in the sustainable commercial utilisation of economically important species but also in the conservation of endemic taxa. This is identified as a major research gap. It needs to be addressed through concentrated efforts by national research organisations and universities, ascertaining the availability of adequate infrastructure, and focused efforts on capacity building. A comprehensive and collaborative research program is urgently needed at the Pan-India level.

 

Keywords: AlgaeBase, aquaculture, bioprospecting, conservation, DNA barcoding, GenBank, genetic resources, molecular systematics, species identification, taxonomy.

 

 

 

Introduction

 

Marine macroalgae are gaining importance globally due to their multifarious applications in commodity products being used in day-to-day life. They are the only source of polysaccharides such as, ulvan, agar, alginates, mannitol, and carrageen having niche applications in biomedical, and pharmaceutical domains (Pereira & Cotas 2024). Studying the marine macro-algal biodiversity is pivotal for understanding the health of marine ecosystems, searching for potent bioactive compounds, and finding latent alternatives for food, feed, and fuels (Rajauria et al. 2015). Conventional morphology-based identification often yields inaccuracies due to phenotypic plasticity coupled with lack of specialized taxonomic expertise. Therefore, DNA barcoding offers a universal and standardized approach including for seaweeds (Hebert et al. 2003; Kowalska et al. 2019). This technique is less susceptible to errors caused by phenotypic variation, life stage, reproductive age, and does not require specialized traditional taxonomy knowledge. Further, it is also important to learn evolutionary lineages, discover novel species, and identify commercially valuable species (Saunders 2005; Chac & Thinh 2023). DNA barcoding provides legally defensible scientific evidence-based lab-to-market species identification, ensuring traceability and linking product authenticity to performance outcomes. For example, use of DNA barcoding for identifying novel seaweed species (Lagourgue et al. 2022), uncover genetic groups and morphospecies of Saccharina sp. (Saunders and McDevit 2014), or correctly identify Bulung sangu (Gracilaria sp.) to decide specific and correct cultivation methods to meet falling supply to high demands (Wirawan et al. 2021). For seaweeds such as Gracilaria dura known for high gel strength (> 1,900 g cm−2 at 1%) if misidentified with other Gracilaria spp. may lead to performance failure and economic loss (Mantri et al. 2022a). Further DNA barcode information may be used to track and stop illegal trade of endangered species (Mishra et al. 2017).

India is globally recognized as a megadiverse country, with 7–8% of the world’s recognized flora and fauna and ranks fourth among the 34 biodiversity hotspots across the 17 megadiverse countries of the world (Mantri et al. 2020). Indian coastline stretches over 11,099 km and the highest number of marine macro-algal taxa have been reported from India compared to countries neighbouring the Indian Ocean (Sahoo 2001). Despite decades of research involving molecular identification of species, the online sequence data for Indian seaweeds is scarce, for example DBIndalgae, first centralized database effort in India to systematically compile information on native marine algae (Bhushan et al. 2016). However, repositories like DIDI (Diatoms image database of India), and Algal Database exist to address the challenges and discrepancies in identifying diatoms and freshwater microalgae respectively (Sharma et al. 2013; Pandey et al. 2016). The studies encompassing systematic integration or quality assessment are highly desired to ensure accuracy and reliability. To our knowledge, this is the first attempt to comprehensively analyse the online available sequence data for Indian seaweeds based on the sequences available in GenBank. The current study aims to provide a comprehensive, scientific inventory of publicly available DNA sequence database of Indian seaweeds. Such analyses would establish an integrated, quality-assured national baseline by consolidating decades of fragmented DNA sequence records. Standardized markers and metadata would enhance comparability across national laboratories, strengthening research and policy synthesis practices. Molecular identification would enhance value-chain growth and product traceability, along with accurate detection of potential invasive, harmful bloom-forming taxa thereby reinforcing biosecurity. Further this effort would be also crucial in identification of rare and threatened taxa, those need immediate conservation attention. Thus, we emphasize the urgent need for continued research, including marker-based sequencing efforts and standardized methodologies to enhance our knowledge base and unlock the full potential of Indian macroalgal biodiversity.

 

 

Methods

 

DNA-barcode sequences for Indian macroalgal species reported in the checklist of Indian marine algae by Rao & Gupta (2015) were obtained from the GenBank database (GenBank 2025). The search terms used were: “India” + “Chlorophyta”, “India” + “Rhodophyta”, “India” + “Phaeophyta”, and “India” + “Ochrophyta” for all the data available throughout the database, irrespective of submission date range. All records for Phaeophyta were combinedly presented under Ochrophyta throughout the manuscript. For each record, accession, organism name, marker/gene, publication, and collection location were extracted. The results were then verified against Web of Science, Scopus, and PubMed databases to confirm species name, marker usage, and sampling locations. Entries without peer-reviewed published record, geographical locations, and the duplicate entries were removed and not considered for the analysis. The accepted taxonomic nomenclature was confirmed from AlgaeBase (Guiry & Guiry 2024). The cleaned data of collected sequences were then categorized based on phylum, class, and primer used to generate the DNA barcodes. The dataset thus obtained was used for the analysis against the latest checklist by Rao & Gupta (2015). The checklist represents 865 macro-algal species from India, including 212 green algae from 46 genera, 211 brown algae from 50 genera, and 442 red algae in 138 genera.

 

 

Results and Discussion

 

A total of 207 unique sequences were obtained for Indian macro-algal species (Table 1) across chloroplast (rbcL, tufA, UPA, atpB, psbA), mitochondria (COI-5P, cox), nucleus (ITS), and ribosome (LSU rDNA, 23S rRNA,18S rRNA) (Figure 1) loci from GenBank establishing a unified baseline for national-scale assessment and reuse. The study found that only 11% of the India marine macro algae were documented from India. The data revealed that in Chlorophyta, only nine genera containing 33 species from six unique orders have been amplified based on chloroplast (39), mitochondrial (5), nuclear (22), and ribosomal (16) gene markers. Ulva sapora and U. paschima are now recognized as synonyms of Ulva tepida and Caulerpa peltata is synonymised with Caulerpa chemnitzia (Guiry & Guiry 2024). For Ochrophyta, 13 species of six genera were identified from three unique orders, with 55% of the generated sequences from chloroplast, 25% from mitochondria, and 10% each from nuclear and ribosomal genes. Moreover, 49 species of 22 genera from 10 unique orders and four varieties have been studied for Rhodophyta. Gracilaria verrucosa has now been renamed Gracilariopsis longissima (Guiry & Guiry 2024). Results revealed an uneven focus on molecular studies, with only 19% of green, 12% of brown, and 16% of red algae species globally. This depends largely on availability and due to more focused attention towards economically important seaweeds that are given priority. The observed seaweeds species of genus Kappaphycus, Gracilaria, Porphyra, Sargassum, Turbinaria, Padina are cultivated at scale for high value compound extraction (carrageenan, agar, alginates, pigments) and to be used as food (Ulva and Caulerpa species). Further, Laurencia, Acanthophora, Caulerpa, Bryopsis were studied for their bioactive properties due to presence of halogenated and terpenoid metabolites. At the genus level, it is only nine of the 46 reported green algal genera (20%), six out of 50 brown algal genera (12%), and 22 of the 138 reported red algal genera (16%) were reported from India. Further, among the 11 molecular markers that were investigated rbcL is the most studied marker (81 sequences), while atpB is the least (only one sequence) investigated marker for Indian marine macro algae (Figure 1). An effective DNA barcode couples sufficient interspecific sequence variation and ease of amplification across diverse taxa (Hollingsworth et al. 2009). Based on assessments of recoverability, sequence quality, and levels of species discrimination, a 2-loci combination of rbcL+matK as the plant barcode is recommended to provide a universal framework for the routine use of DNA sequence data to identify specimens and contribute toward the discovery of overlooked species of land plants (Leliaert et al. 2012). Because land plants evolved from green algal ancestors, the use of rbcL succeeded for seaweed DNA barcoding, as its conserved priming sites and informative variation support dependable amplification and species discrimination. The species delineation in marine macro-algal taxa poses a considerable challenge due to high morphological, anatomical, and reproductive plasticity. Nevertheless, taxonomic concepts in this group are fast evolving globally with the advent of DNA barcoding techniques. This is the first national effort to compile relevant scientific information on DNA barcoding pertaining to Indian marine macro-algae, which was scattered and difficult to access. The analysis revealed minuscule DNA sequence data availability.

Seaweeds offer socio-economic benefits to coastal communities through aquaculture and represent a valuable, yet underexplored resource (Mantri et al. 2020). The seaweed aquaculture industry is valued at USD 14 billion globally, producing 34.7 million tonnes of wet weight annually (FAO 2022) encompassing 51.3% of the global aquaculture industry with 6.2% annual growth (Duarte et al. 2022), but India contributes only 0.01% of the cultivated seaweeds, indicating a colossal gap (Mantri et al. 2022b). The lack of DNA sequence data significantly hinders our ability to understand the full spectrum of seaweed biodiversity range (endemic, exotic, and migratory species), abundance (dominant, rare, vulnerable, and endangered species), ecological roles, and correct taxonomic placement of Indian macro-algal species. We consider, DNA barcoding data at the national level would not only help us in the sustainable commercial utilisation of economically important species (Rao & Mantri 2006) but also in the conservation of endemic taxa (Rathod et al. 2023). This is identified as a major research gap. It needs to be addressed through concentrated efforts by national research organizations and universities, ascertaining the availability of adequate infrastructure, and focused efforts on capacity building (Mantri et al. 2020). However, the reliance on public-domain with heterogenous quality, incomplete metadata, and marker bias may limit resolution for certain clades and addressing these gaps would require coordinated national sampling, sequencing efforts, and capacity building.

The results provide first national current coverage of barcodes for Indian seaweed species, marker bias, and the availability of miniscule molecular data compared to the huge biodiversity. This calls for a comprehensive and collaborative research program urgently needed at the Pan-India level.  India is investing large amounts of money in seaweed farming and value-chain development, and dependable species authentication underpins quality, traceability of high value products (Mantri et al. 2022a). Early detection of invasive species, surveillance of harmful algae, and identifying species at risk would aid in strengthening coastal biosecurity, select germplasm banking, risk management, and conservation and policy formation (Armstrong & Ball 2005; Hofmann et al. 2025). Multi-gene and method-integrated barcoding frameworks further improve resolution for difficult groups, enhancing surveillance sensitivity and reliability. This efficiency compounds benefits across ecology, systematics, and bioprospecting, where barcoding underpins access to novel bioactives and authentic species-level insights.

 

Data availability

The datasets generated during and/or analysed during the current study are available from the corresponding author upon reasonable request.

 

 

Table 1. Marker-wise distribution of publicly available DNA barcode sequences from GenBank for Indian marine macroalgae by phylum, class, order and taxonomically accepted scientific names of seaweeds from India.

Phylum

Class

Order

Scientific Name

Primers

Chlorophyta

Ulvophyceae

Bryopsidales

Bryopsis sp.

rbcL

Caulerpa racemosa var. lamourouxii

ITS

Caulerpa agardhii

rbcL, 18S rRNA

Caulerpa fergusonii

ITS

Caulerpa mexicana var. pluriseriata

tufA

Caulerpa mexicana.

rbcL, 18S rRNA, tufA, ITS

Caulerpa microphysa

rbcL, 18S rRNA, tufA, ITS

Caulerpa peltata (C. chemnitzia)

rbcL, 18S rRNA, tufA, ITS

Caulerpa racemosa

rbcL, 18S rRNA, tufA, ITS

Caulerpa scalpelliformis

rbcL, 18S rRNA, tufA, ITS

Caulerpa serrulata

rbcL, 18S rRNA, tufA, ITS

Caulerpa sertularioides

rbcL, 18S rRNA, tufA, ITS

Caulerpa taxifolia

rbcL, 18S rRNA, tufA, ITS

Caulerpa veravalensis

rbcL, 18S rRNA, tufA, LSU rDNA

Caulerpa verticillata

rbcL, 18S rRNA, tufA, ITS

Cladophorales

Chaetomorpha antennina

rbcL

Cladophora goaensis

ITS

Dasycladales

Acetabularia jalakanyakae

18S rRNA

Ulvales

Ulva chaugulei

rbcL, ITS

Ulva compressa

rbcL, COI-5P, UPA

Caulerpa chemnitzia

rbcL

Ulva flexuosa

rbcL, COI-5P, UPA

Ulva intestinalis

rbcL, ITS, cox

Ulva lactuca

rbcL, 18S rRNA, ITS

Ulva ohnoi

rbcL, ITS

Ulva paschima (U. tepida)

rbcL, COI-5P, UPA

Ulva reticulata

rbcL, ITS

Ulva sapora (U. tepida)

ITS, atpB, 23S rRNA

Ulva uniseriata

ITS

Ulvella leptochaete

rbcL, ITS, COI-5P

Ulvella sp.

rbcL, ITS

 

Ulvophyceae

Ulotrichales

Gayralia brasiliensis

ITS

Chlorodendrophyceae

Chlorodendrales

Tetraselmis indica

18S rRNA

Ochrophyta

Phaeophyceae

Ectocarpales

Chnoospora implexa

rbcL, cox

Chnoospora sp.

rbcL, cox

Dictyotales

Dictyota bartayresiana

rbcL

Dictyota dichotoma

rbcL

Padina tetrastromatica

rbcL

Fucales

Sargassum aquifolium

23S rRNA

Sargassum linearifolium

rbcL

Sargassum plagiophyllum

23S rRNA

Sargassum polycystum

rbcL

Sargassum swartzii

rbcL

Sargassum tenerrimum

rbcL

Sargassum zhangii

ITS, cox

Turbinaria ornata

ITS, cox

Anthophycus longifolius

rbcL

Anthophycus sp.

rbcL, cox

Rhodophyta

Bangiophyceae

Bangiales

Phycocalidia acanthophora var. robusta

rbcL, COI-5P

Phycocalidia sukshma

rbcL, COI-5P

Phycocalidia vietnamensis

rbcL, COI-5P

Porphyra kanyakumariensis

rbcL, COI-5P

Porphyra tenera

rbcL

Porphyra yamadae

rbcL, cox

Porphyra yezoensis

rbcL

Pyropia acanthophora var. robusta

rbcL, cox

Pyropia vietnamensis

cox

Florideophyceae

Batrachospermales

Lemanea manipurensis

rbcL

Sirodotia assamica

rbcL, COI-5P

Sheathia assamica

rbcL

Ceramiales

Caloglossa fluviatilis

rbcL

Palisada perforata

rbcL

Caloglossa beccarii

rbcL, LSU rDNA

Acanthophora spicifera

rbcL

Laurencia thyrsifera

rbcL, ITS, COI-5P

Rhodophyta

Florideophyceae

Ceramiales

Herposiphonia akidoglossa

rbcL, COI-5P, psbA

Spyridia hypnoides

rbcL, UPA, cox, LSU rDNA

Corallinales

Jania rubens

rbcL

Gelidiales

Gelidiella acerosa

rbcL, COI-5P

Gelidiella indica

rbcL, COI-5P, cox

Gigartinales

Hypnea bullata

rbcL, COI-5P, UPA

Hypnea indica

rbcL, COI-5P, UPA

Hypnea musciformis

rbcL

Hypnea nidifica

rbcL, COI-5P, UPA, cox

Hypnea nigrescens

rbcL, COI-5P, UPA

Hypnea spinella

rbcL, COI-5P, UPA

Hypnea valentiae

rbcL, ITS

Kappaphycus alvarezii

rbcL, ITS, COI-5P, UPA, cox

Sarconema filiforme

rbcL, COI-5P, cox

Gracilariales

Gracilaria corticata

rbcL, ITS, COI-5P, cox

Gracilaria corticata var. corticata

rbcL,18s RNA, cox

Gracilaria dura

rbcL, 18s RNA, cox

Gracilaria corticata var. cylindrica

rbcL, 18s RNA, cox

Gracilaria debilis

rbcL, 18s RNA, cox

Gracilaria edulis

23S rRNA

Gracilaria fergusonii

23S rRNA

Gracilaria foliifera

rbcL, 18s RNA, cox

Gracilaria gracilis 

rbcL, 18s RNA, cox

Gracilaria salicornia

rbcL

Gracilaria textorii

rbcL, 18s RNA, cox

Gracilaria verrucosa (Gracilariopsis longissima)

rbcL, 23S rRNA

Gracilariopsis lemaneiformis

rbcL, 18s RNA, cox

Hydropuntia edulis

rbcL

Halymeniales

Grateloupia catenata

rbcL

Grateloupia orientalis

rbcL

Grateloupia sp.

rbcL

Nemaliales

Liagora albicans

rbcL

 

For figure - - click here for full PDF

 

 

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