caa a22 4500 477134300 CHVBK 20180405111713.0 cr unu---uuuuu 170330e19970901xx s 000 0 eng 10.1023/A:1003002805922 doi (NATIONALLICENCE)springer-10.1023/A:1003002805922 Evidence of functional unreduced gametes in Trifolium repens L [Elektronische Daten] [S.W. Hussain, W.M. Williams] 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) F1 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. Kluwer Academic Publishers, 1997 interspecific hybrids nationallicence Trifolium repens nationallicence Trifolium nigrescens nationallicence unreduced gametes nationallicence Hussain S.W. AgResearch Grasslands, Private Bag 11008, Palmerston North, New Zealand aut Williams W.M. AgResearch Grasslands, Private Bag 11008, Palmerston North, New Zealand aut Euphytica Kluwer Academic Publishers 97/1(1997-09-01), 21-24 0014-2336 97:1<21 1997 97 10681 https://doi.org/10.1023/A:1003002805922 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1023/A:1003002805922 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Hussain S.W. AgResearch Grasslands, Private Bag 11008, Palmerston North, New Zealand aut NATIONALLICENCE 700 1- Williams W.M. AgResearch Grasslands, Private Bag 11008, Palmerston North, New Zealand aut NATIONALLICENCE 773 0- Euphytica Kluwer Academic Publishers 97/1(1997-09-01), 21-24 0014-2336 97:1<21 1997 97 10681 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer