Evidence of functional unreduced gametes in Trifolium repens L
The current research reports the first evidence of functional 2n gametes in megaspores of Trifolium repens L. Reciprocal backcrossing of a colchicine doubled hexaploid (2n = 6x = 48) T. repens × T. nigrescens (6x H-6909-5) F^sub 1^ hybrid to T. repens produced four seeds from 1700 pollinations. The...
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Published in | Euphytica Vol. 97; no. 1; pp. 21 - 24 |
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Main Authors | , |
Format | Journal Article |
Language | English |
Published |
Dordrecht
Springer
01.01.1997
Springer Nature B.V |
Subjects | |
Online Access | Get full text |
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Summary: | The current research reports the first evidence of functional 2n gametes in megaspores of Trifolium repens L. Reciprocal backcrossing of a colchicine doubled hexaploid (2n = 6x = 48) T. repens × T. nigrescens (6x H-6909-5) F^sub 1^ hybrid to T. repens produced four seeds from 1700 pollinations. The backcross involving 6x H-6909-5 as the female parent and T. repens as the male resulted in only one seed which was, as expected, a pentaploid (2n = 5x = 40) presumably carrying four genomes of T. repens and one genome of T. nigrescens. On the other hand, those backcrosses which utilised T. repens as the female parent and 6x H-6909-5 as the male parent, resulted in 3 viable seeds. These were unexpectedly all heptaploid (2n = 7x = 56) with presumably six genomes of T. repens and one genome of T. nigrescens. The occurrence of heptaploids from a T. repens × 6x H-6909-5 (4x-6x) cross can only be explained by the union of n (= 3x = 24) pollen from 6x H-6909-5 with 2n (= 4x = 32) eggs from T. repens.[PUBLICATION ABSTRACT] |
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ISSN: | 0014-2336 1573-5060 |
DOI: | 10.1023/A:1003002805922 |