Phenology and seed germination of the Indian Screw Tree Helicteres isora L. (Malvales: Malvaceae)

Main Article Content

Mariappan Muthukumar
http://orcid.org/0000-0002-8071-6492
Thiruppathi Senthil Kumar
http://orcid.org/0000-0003-4967-0569
Mandali Venkateswara Rao
http://orcid.org/0000-0001-9271-9861

Abstract

Helicteres isora L. (Malvaceae), a medicinally important tree species used in Ayurveda as well as by folklore practitioners, is studied for its phenology, associated problems with the environment and anthropogenic effects.  In Helicteres isora, flower buds are initiated by the end of July and flowering occurs during the middle of August to late October.  Fruits mature during late January to early April.  In between various factors like blister beetles, unidentified worms, deficit rainfall, early summer affect the flowering and seed setting, which cause 35–45 % loss.  Seed viability of mature seeds were recorded 88.2% at fresh collection and decreases over period of time. In vitro, among the various treatments, acid treated seeds (H2SO4, 98.0%; 1 min) resulted in the best germination response of 84.5%.  Sterile wet cotton soaked with sterile distilled water was found suitable for germination compared to other substratum, while half-strength MS medium with 2.0% sucrose was suitable for seedling development.

Article Details

How to Cite
[1]
Muthukumar, M., Kumar, T.S. and Rao, M.V. 2017. Phenology and seed germination of the Indian Screw Tree Helicteres isora L. (Malvales: Malvaceae). Journal of Threatened Taxa. 9, 12 (Dec. 2017), 11040–11044. DOI:https://doi.org/10.11609/jott.3058.9.12.11040-11044.
Section
Short Communications

References

Anonymous (1999). Meteorological report, 1970–1999, Horticulture Department, Padasolai, Kolli hill, Tamil Nadu.

Atluri, J.B., S.P. Rao & C.S. Reddi (2000). Pollination ecology of Helicteres isora Linn (Sterculiaceae). Current Science 78: 713–718.

Badave, G.N. & S.C. Jadhav (1998). Germination studies in local plants from Koyana Valley, I: Murudsheng- Helicteres isora L. Ayurveda Update 1: 10.

Ferdousi, A., O. Rahman & A. Hassan (2014). Seed germination behaviour of six medicinal plants from Bangladesh. Bangladesh Journal of Plant Taxonomy 21: 71–76.

Geological Survey of India (1976). Report on the investigation for Bauxite in Kolli Malai, Salem District, Tamil Nadu. Progress report for the field season 1975–76. Geological Survey of India, Tamil Nadu Circle, Madras.

Kumar, N. & A.K. Singh (2014). Plant profile, phytochemistry and pharmacology of Avartani (Helicteres isora Linn.): A review. Asian Pacific Journal of Tropical Biomedicine 4: S22–S26.

Murashige, T. & F. Skoog (1962). A revised medium for rapid growth and bioassays with tobacco tissue cultures. Physiologia Plantarum 15: 473–497.

Nadkarni, K.M. & A.K. Nadkarni (1976). Indian Materia Medica, Vol. 1. Popular Prakashan, Bombay, India, 615–616pp.

Santharam, V. (1996). Visiting patterns of birds and butterflies at a Helicteres isora Linn. (Sterculiaceae) clump. Current Science 70: 316–319.

Sebastine, K.M. (1954). Kaivun fibre. Economic Botany 8: 114–117; http://doi.org/10.1007/BF02984726

Shriram, V., V. Kumar & M.G. Shitole (2008). Indirect organogenesis and plant regeneration in Helicteres isora L., an important medicinal plant. In: Vitro Cell & Developmental Biology. Plant 44: 186–193.

Ved, D.K. & G.S. Goraya (2007). Demand and Supply of Medicinal Plants in India. NMPB, New Delhi & FRLHT, Bangalore, India.