Studies on the Cytology and Phylogeny of South Indian Grasses

Cytology of genus Sporobolus R. Br. from North India (Punjab plain).

“…Tateoka (1965) reported n=6 in S. molleri from Uganda and another base number x=6. Later on, Christopher (1985) on the basis of record of n=6 for S. maderapatonous from South India supported the presence of x= 6. Now with the recording of n=12 (4x) and n=18 (6x) for S. diander from North India, the existence of x=6 for Sporobolus is confirmed.…”

Cyto-taxonomic studies of Rottboellia exaltata Linn. Complex.

“…The earlier cytological reports indicate several chromosome numbers in this species such as 2n=20 (Moffett and Hurcombe 1949, Celarier 1957, Rama Rao 1962, 2n=36 (Krishnaswamy et al 1954), 2n=40 (Christopher 1978) and 2n=50 (Chen and Hsu 1962). But it is not known whether these reports pertain to the "short" or "tall robust" morphotype.…”

“…But it is not known whether these reports pertain to the "short" or "tall robust" morphotype. Christopher (1984) has reported that the "short" morphotype is a diploid with 2n=20 and the "tall robust" mor photype is tetraploid with 2n=40 chromosomes. In the present paper detailed cytological as well as morphological studies of the spiklet characters have been made to find out if there is any correlation between the cytological differences and morphological characters of the spikelets in these two morphotypes.…”

Studies on the Cytology and Phylogeny of South Indian Grasses

“…49,27). Microsporogenesis has been studied in detail in these two species (Christopher 1971). According to Smith and Raleigh (1948), polyploidy, meiotic irregularities and apomixis are of frequent occurrence in Paspalum.…”

“…In the first two reports in this series, cytological observations on 53 species of South Indian grasses belonging to the subfamilies Bambusoideae, Oryzoideae, Arundinoideae, Festucoideae and Eragrostoideae have been described (Christopher andAbraham 1971, 1974). Results of cytological observations on 57 species representing 21 genera, of the tribe Paniceae (subfamily Panicoideae) are presented in this report.…”