Fusion of centromeres and star formatons at pachytene of Cajanus × Atylosia hybrids

Reddy, L. J.

doi:10.1038/hdy.1984.100

Cited by 1 publication

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“…The higher frequency of quadrivalents observed in the present material could be due to reasons other than gross chromosomal abnormalities. It is noteworthy, that Reddy (1984) reported in interspecific hybrids of pigeonpea and three wild Cajanus species, a phenomenon known as 'star formations' at pachytene due to fusion of two to four bivalents at centromeric region and subsequent formation of secondary associations at diakinesis. These associations may mimic quadrivalent formations.…”

Section: Cytologymentioning

confidence: 93%

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2001

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Cajanus reticulatus var. grandifolius, endemic to Australia and a wild relative of the cultivated species, C. cajan, was successfully crossed with the latter as the female parent. The major wild species characters such as persistent stipules, long pod hairs, pod shattering, brown seeds with grey speckles, and presence of seed strophiole were dominant in the hybrid. For growth and branching habit, and leaflet, flower, pod, and seed size, the hybrid was intermediate between the parents. The meiotic cells of the hybrid were found to have quadrivalents, trivalents, univalents, and showed reduced chromosome pairing as revealed by the increased number of rod bivalents per cell at metaphase-I, and stickiness and precocious movement of chromosomes to poles in the second division. In comparison to the parents, the hybrid had fewer pods and seeds. However, these anomalies in the interspecific hybrid are not significant enough to preclude the gene transfer from C. reticulatus to the cultivated species through a sexual route.

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Section: Cytologymentioning

confidence: 93%