Cytogenetic Analysis of a Desynaptic Mutant in Barley (<i>Hordeum vulgare</i> L.)

Cytogenetics of Tephrosia I. On the differential chromosome pairing in colchiploid stock of Tephrosia wallichii.

“…Tradescantia (Celarier 1955), Datura (Bergner et al 1934), Nicotiana (Clausen 1931), Triticum (Li et al (1945), Hordeum vulgare (Enns andLarter 1960, Sharma andReinbergs 1974), Allium cepa (Koul 1962, Kaul 1975, A. amplectens (Levan 1940), Pennisetum typhoides (Dhesi et al 1973, Singh et al 1977, P. ramosum (Jauhar et al 1971), Godetia (HA kensson 1943, Coleus (Vasudevan et al 1967), Rye grass (Ahloowalia 1969a, b), Solanum vendlandii (Cheenaveeraiah and Krishnappa 1968), Colocasia antiquorum (Krishnan et al 1970), Amorphophallus companulatus (Magoon and Sadasivaiah 1967), Sorghum (Sadasivaiah and Magoon 1965), Avena (Thomas and Rajhathy 1966), Pisum sativum (Gottschalk 1978). Contrary to the long list of desynaptic plants, asynapsis has been reported in only few viz.…”

Induced desynaptic variation in poppy (Papaver somniferum L.)

“…Additional factors, located either at the chiasmata or between sister chromatids are required to maintain chiasmata. Earlier workers, like Sharma and Reinbergs (1974), proposed that recessive homozygous condition of ds genes might cause chiasma to dissociate early. Simchen and Stamberg (1969) concluded from their study that a mutation in highly conserved rec genes system might lead to failure of chiasma formation and recombination.…”

Asynaptic and desynaptic mutants in barley.

“…Various causes have been suggested for the occurrence of asynapsis and de synapsis, such as structural changes in chromosomes, failure of chromosome pairing in interspecific hybrids, and gene action (Beadle 1933, Beasley and Brown 1942, Prakken 1943, Li et al 1945, Celarier 1955, Gottschalk and Villalobos-Pietrini 1965, Jauhar and Singh 1969, Sharma and Reinbergs 1974, Sjodin 1970. Environ mental factors also influence chromosome pairing and chiasma formation (Li et al 1945, Soost 1951.…”

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Both spontaneous and induced types of asynapsis and desynapsis have been reported in a number of plant species (Beadle 1933, Prakken 1943, Li et al 1945, Soost 1951, Ross et al 1960, Chao et al 1960, Dyck and Rajhathy 1965, Riley and Law 1965, Chennaveeraiah and Krishnappa 1968, Jauhar and Singh 1969, Sjodin 1970, Sharma and Reinbergs 1974, Srivastava 1974, Palmer 1974, Sahu et al 1981. In most of the cases they have been governed by genes.

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