Abstract
Cytogenetical studies of Pisum arvense, Lathyrus aphaca, L. sativus, Cyamopsis psoralioides, Glycine hispida, Vigna catjang and Dolichos biflorus was made. Morphology of somatic chromosomes was studied and idiograms were presented for all the species. Satellited pair of chromosomes were recorded in the first four species. Chromosomes with median, sub-median and sub-terminal primary constrictions were reported. The longest chromosome was observed in Lathyrus sativus (7.4μ) and the shortest in Glycine hispida (1.3μ). Meiotic studies in most of the species revealed regular chiasma formation. Chiasma frequency per bivalent was highest in Lathyrus aphaca (1.7) and lowest in Pisum arvense (1.3). Various meiotic anomalies were encountered. These included precocious separation of bivalents, stray bivalents, multivalents, delayed separation of bivalents, laggards and chromatin bridges. Multivalent formation was reported for the first time in Pisum arvense, Lathyrus aphaca, L. sativus, Cyamopsis psoralioides and Vigna catjang. Chromosome numbers already noted in different species were confirmed except in case of Dolichos biflorus. Pollen sterility was determined in all the cases, highest being 40% in Lathyrus sativus and lowest being 2% in Dolichos biflorus.
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