Cytological Studies in Some Central and Eastern Himalayan Grasses

Cytological studies in the north Indian grasses.

“…The present taxon would be diploid on the base number x=9. We had earlier reported this number from a locality near Chandigarh (Mehra and Sharma 1975f). Previously, the tetraploid and hexaploid of this species are reported in the literature (see Mehra and Sharma 1975a) in addition to a cytotype with n=10 investigated by Mehra et al (1968).…”

“…10), which on the base number x=10 for the genus Dactyloctenium, would be diploid and tetraploid respectively. The diploid with n=10 was earlier reported, for the first time, by us (Mehra and Sharma 1975f) from the same locality whereas the tetraploid with n=20 has been presently investigated for the first time. The tetraploid was more robust in vegetative and inflorescence parts than the diploid, an effect usually associated with polyploidy.…”

“…We had earlier reported a new cytotype of this species with n=15 and normal meiosis from the hills of Nainital (Mehra andSharma 1973, 1975a). The cytotype with n=15 has been presently rediscovered from Nainital hills (Figs.…”

Some considerations on the phylogeny and chromosomal evolution in grasses.

“…Of the living grass tribes, the members of the tribe Bambuseae still retain some of these characters which as already pointed out by Mehra and Sharma (1975), is probably due to the fact that the bamboos are long lived perennials with efficient methods of vegetative multiplication and due to their infrequnet flower ing, they had fewer generations and hence lesser opportunities in recombinational and structural chromosomal alterations. The bamboo genera Bambusa, Gigan tochloa and Cephalostachyum possess ovaries with six vascular traces whereas in others these have been reduced to five and four.…”

A revision of <I>Garnotia</I> (<I>Gramineae</I>) in Malesia and Thailand

“…Anatomy -Kranz MS. Karyology -2n = usually 20 (Gould 1972: 519;Rice et al 2014), but for 'G. stricta' from India there are reports of 20+0-2B, 30 (Rice et al 2014), 38 (Muniyama & Narayan 1975), 40 (Sindhe & Narayan 1976), n = 20+1B (Mehra & Sood 1974), 30 (Mehra & Sharma 1975). 2n = 32 was counted for G. tenella (Arn.…”