Certain aneu ploids in di ploid and induced auto tetra ploid pea pisum sativum

Mercykutty, V.C.; Kumar, H.

Genetica Agraria 38(1): 25-34


ISSN/ISBN: 0016-6685
Accession: 004902566

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The frequency of aneuploids in the progenies of induced autotetraploids (C2 generation) of 4 diverse cultivars of pea was .apprx. 6%; pentasomic tetraploid (4x + 1 = 29 chromosomes) was more frequent than trisomic tetraploid (4x-1 = 27 chromosomes). Indigenous cv. T 163 tetraploid gave maximum (9.86%) aneuploids. Both pentasomic and trisomic tetraploids were distinct from their respective euploid and among themselves. Both pentasomic and trisomic tetraploids showed high chromosome abnormalities (58-75% cells) and pollen sterility (27.43-54.71%) as compared to sister euploids which had chromosome abnormalities and pollen sterility ranging from 21.0-40.0% and 23.5-35.3%, respectively. Primary and double trisomics, 1 each, isolated from the normal diploid, differed from each other and from diploid. The chromosome abnormalities and pollen sterility were 73 and 47.6% in primary trisomics and 80 and 81.2%, respectively. Seed set in aneuploid tetraploid and double trisomic was nil.