Reproductive biology of Ophiorrhiza caudata C.E.C.Fisch. (Rubiaceae), an endemic and endangered creeping perennial herb of the Western Ghats, India

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Maria Theresa
Appukuttan Kamalabai Sreekala
Jayalakshmi Mohanlal

Abstract

Ophiorrhiza caudata is a creeping, perennial herb distributed along wet and shady areas. The species is distylous with two distinct floral morphs: pin and thrum. Flowering usually occurs during the monsoon season. No particular difference was noticed in the flowering phenology of the two morphs. Presently the species is self-incompatible, however, it shows a tendency towards intramorph compatibility. Fruit set is above 60% in open pollination and intermorph pollination. Bees and butterflies are the major pollinators. The pollen flow between the two floral morphs varies depending upon floral morphology and pollinators. Fruit is a bi-valved capsule which dehisces by a splashing drop mechanism. The seeds are very minute. The rate of seed germination and seedling establishment in the wild condition is very poor due to adverse climatic factors. Ophiorrhiza caudata is struggling for survival in its natural habitat, where habitat fragmentation, climatic factors and poor seedling establishment could account for its narrow distribution.

Article Details

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Communications

References

Almeida, E.M. & M.A.S. Alves (2000). Phenology of Psychotria nuda and P. brasiliensis (Rubiaceae) in an area of the Atlantic forest, Southeast of Brazil. Acta Botanica Brasilica 14: 335–346.

Baker, H.G. (1966). The evolution, functioning and breakdown of heteromorphic incompatibility systems. Evolution 20: 349–368

Barrett, S.C.H., Lloyd, D.G. & J. Arroyo (1995). Stylar polymorphism and the evolution of heterostyly in Narcissus (Amaryllidaceae), pp. 336–376. In: Lloyd D.G. & S.C.H. Barrett (eds.). Floral Biology: Studies on Floral Evolution in Animal Pollinated Plants. Chapman and Hall, New York.

Barrett, S.C.H. (1985). Floral trimorphism and monomorphism in continental and island populations of Eichornia paniculata (Spreng.) Solms. (Pontederiaceae). Botanical Journal of the Linnean Society 25: 41–60.

Castro, C.C. & A.C. Araujo (2004). Distyly and sequential pollinators of Psychotria nuda (Rubiaceae) in the Atlantic rain forest, Brazil. Plant Systematics and Evolution 244: 131–139.

Consolaro, H., E.B. Silva & P.E. Oliveira (2005). Floral variation and reproductive biology of Manettia cordifolia Mart. (Rubiaceae). Brazilian Journal of Botany 28: 85–94.

Consolaro, H., S.C.S. Silva & P.E. Oliveira (2011). Breakdown of distyly and pin-monomorphism in Psychotria carthagenensis Jacq. (Rubiaceae). Plant Species Biology 26: 24–32.

Cruden, R.W. (1977). Pollen-ovule ratios: a conservative indicator of breeding system in flowering plants. Evolution 31: 32–46.

Dafni, A. (2007). Pollination Ecology. Field manual. Ashoka Trust of Research in Ecology and the Environment, Bangalore, 17 pp.

Darwin, C. (1877). The Different Forms of Flowers on Plants of the Same Species. John Murray, London, UK.

Deb, D.B. & D.C. Mondal (1997). Taxonomic revision of the genus Ophiorrhiza L. (Rubiaceae) in Indian subcontinent. Bulletin of Botanical Survey of India 39: 99–100.

Dulberger, R. (1970). Floral dimorphism in Anchusa hybrida Ten. Israel Journal of Botany 19: 37–41.

Eckert, C.G. & S.C.H. Barrett (1994). Tristyly, self-compatibility and floral variation in Decodon verticillatus (Lythraceae). Biological Journal of the Linnean Society 53: 1–30.

Fonseca, N.G., Kumagai, A.F. & O.H.H. Mielke (2006). Lepidopterans visiting the flowers of Stachytarpheta cayennensis (Rich.) Vahl (Verbenaceae) in Atlantic Forest remnants, Minas Gerais, Brasil. Revista Brasileira de Entomologia 50: 399–405.

Ganders, F.R. (1979). The biology of heterostyly. New Zealand Journal of Botany 17: 607–635.

Gross, K.L. & P.A. Werner (1982). Colonizing abilities of “biennial” plant species in relation to ground cover: implications for their distributions in a successional sere. Ecology 63: 921–931.

Joseph, G. & J.P. Joseph, (2009). Rediscovery of Ophiorrhiza caudata (Rubiaceae) from the Western Ghats of Kerala. Rheedea 19: 45–46.

Koptur, S., Haber, W.A., Frankie, G.W. & H.G. Baker (1988). Phenological studies of shrub and treelet species in tropical cloud forest of Costa Rica. Journal of Tropical Ecology 4: 323–346.

Li , A., X. Wu, D. Zhang & S.C.H. Barrett (2010). Cryptic dioecy in Mussaenda pubescens (Rubiaceae): a species with stigma-height dimorphism. Annals of Botany 106: 521–531.

Lloyd, D.G. & C.J. Webb (1992). The selection of heterostyly, pp. 179–207. In: Barrett, S.C.H. (ed.). Evolution and Function of Heterostyly. Monographs on Theoretical and Applied Genetics. Springer-Verlag, Berlin.

Mabberley, D.J. (2008). The Plant-Book: A portable dictionary of plants, their classification and uses. 3rd Edition. Cambridge University Press, Cambridge, UK, 603 pp.

Marks, P.L. (1974). The role of pin cherry (Prunus pennsylvanica L.) in the maintenance of stability in northern hardwood ecosystems. Ecological Monographs 44: 73–88.

Martin-Gajardo, I.S. & L.P.C. Morellato (2003). Phenology of understorey Rubiaceae in the Atlantic forest, southeastern Brasil. Brazilian Journal of Botany 26: 299–309.

Naiki, A. & M. Kato (1999). Pollination system and evolution of dioecy from distyly in Mussaenda parviflora (Rubiaceae). Plant Species Biology 14: 217–227.

Nakanishi, H. (2002). Splash seed dispersal by raindrops. Ecological Research 17: 663–671.

Ornduff, R. (1976). The reproductive system of Amsinckia grandiflora, a distylous species. Systematic Botany 1: 57–66.

Pailler, T. & J.D. Thompson (1997). Distyly and variation in heteromorphic incompatibility in Gaertnera vaginata (Rubiaceae) endemic to La Reunion Island. American Journal of Botany 84: 315–327.

Philipp, M. & O. Schou (1981). An unusual heteromorphic incompatibility system: distyly, self-incompatibility, pollen load and fecundity in Anchusa officinalis. New Phytologist 89: 693–703.

Platt, W.J. (1975). The colonization and formation of equilibrium plant communities on badger disturbances in a tall-grass prairie. Ecological Monographs 45: 285–305.

Rabinowitz, D. (1978). Early growth of mangrove seedlings in Panama and an hypothesis concerning the relationship of dispersal and zonation. Journal of Biogeography 5: 113–133.

Silva, N.A.P., Frizzas, M.R. & C.M. Oliveira (2011). Seasonality in insect abundance in the “Cerrado” of Goias State, Brazil. Revista Brasileira de Entomologia 55: 79–87.

Stone, J.L. & J.D. Thomson (1995). Pollen donation patterns in a tropical distylous shrub (Psychotria suerrensis; Rubiaceae). American Journal of Botany 82: 1390–1398.

Toler, T.R., Evans, E.W. & V.J. Tepedino (2005). Pan-trapping for bees (Hymenoptera: Apiformes) in Utah’s West Desert: the importance of color diversity. The pan –pacific entomologist 81(3/4): 103–113.

Uday, M.B. & A.K. Kondapi (2010). Neurotoxic activity of a Topoisomerase-1 inhibitor, camptothecin, in cultured cerebellar granule neurons. Neuro Toxicology 31: 730–737.

Valois-Cuesta, H., Y.L. Diana & Q. Zulay (2009). Reproductive ecology of Psychotria Poeppigiana (Rubiaceae): A comparative analysis between long-styled and short-styled plants. Ecotropicos 22: 1–12.

Watanabe, K., H. Kato & S. Takashi (2014). Distyly and incompatibility in Psychotria homalosperma (Rubiaceae), an endemic plant of the oceanic Bonin (Ogasawara) Islands. Flora – Morphology, Distribution, Functional Ecology of Plants 209: 641–648.

Werner, P.A. (1977). Colonization success of a ‘biennial’ plant species: experimental field studies of species colonization and replacement. Ecology 58: 840–849.

Wolda, H. (1988). Insect seasonality: Why? Annual Review of Ecology and Systematics 19: 1–18.

Wolff, D. & S. Liede-Schumann (2007). Evolution of flower morphology, pollen dimorphism, and nectar composition in Arcytophyllum, a distylous genus of Rubiaceae. Organisms Diversity and Evolution 7: 106–123.

Yamazaki, Y., H. Sudo, M. Yamazaki, N. Aimi & K. Saito (2003). Camptothecin biosynthetic genes in hairy roots of Ophiorrhiza pumila: Cloning, characterization and differential expression in tissues and by stress compounds. Plant Cell Physiology 44: 395–403.