Abstract
Drimia (Urgineoideae: Hyacinthaceae) is a group of geophytes that bear tunicated bulbs. It is represented by more than 100 species distributed in Southern Europe, Africa and Asia. In India, Drimia has nine species (Drimia indica, D. coromandeliana, D. govindappae, D. nagarjunae, D. polyantha, D. polyphylla, D. raogibikei, D. razii and D. wightii). Species of the genus fall in two groups, namely, synanthous and hysteranthous. In the former, the leaves and flower appear simultaneously, while the latter group shows two distinct phases wherein the vegetative (leaf-bearing) and reproductive (flowering-bearing) periods are separated in time. Similarly, based on anthesis, species can be segregated into two groups, viz. night-blooming and day-blooming species. This is actually a temporal isolation that prevents gene flow amongst species. Of the nine species in India, Drimia polyphylla which is known to occur in the Deccan Peninsula has never been collected since its type collection. Drimia nagarjunae, the most robust Indian species, is probably closely related to the African D. maritima. Drimia species are well known for their large-sized chromosomes with usually subterminal constrictions. Seven species have been cytogenetically examined so far. Cytogenetical studies reveal the presence of many cytotypes at the population level. The most common diploid chromosome number for Indian Drimia is 2n = 20. The species exhibiting 2n = 20 are Drimia indica, D. govindappae, D. nagarjunae, D. polyantha, D. razii and D. wightii. In addition, diploid numbers (2n) of 30 (Drimia indica), 40 (D. coromandeliana, D. indica and D. species) and 60 (D. indica) are also on record. Geographical distribution of Drimia species and their cytotypes is well correlated. For instance, populations of Drimia species on higher altitudes where edapho-climatic conditions are harsh show presence of B chromosomes. Crossability studies in Indian Drimia show that D. nagarjunae and D. wightii are reproductively isolated from the rest of the species, while other species show varying degree of crossability indicating their genetic proximity.
In the present communication, we discuss morphology, cytogenetics, crossability behaviour and flowering phenology of Indian Drimia species.
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Lekhak, M.M., Yadav, P.B., Yadav, S.R. (2017). Cytogenetic Studies in Indian Drimia Jacq. (Urgineoideae: Hyacinthaceae). In: Bhat, T., Wani, A. (eds) Chromosome Structure and Aberrations. Springer, New Delhi. https://doi.org/10.1007/978-81-322-3673-3_7
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