| Abstract Detail
Conference Wide Elbakyan, Araksya H. [1]. Pollen fertility in some interspecific hybrids of tomato. THE decrease of pollen fertility in interspecific hybrids F1 between self-compatible Lycopersicon esculentum (Krasnodarets variety) and wild L.hirsutum (self-incompatible), L. hirsutum var.glabratum (self-fertile), L. cheesmanii (self-compatible) species is studied. For determining the pollen fertility, fresh pollen grains were coloured by acetocarmine and observed with binocular microscope. Pollen fertility of cultural tomato and wild species was enough high (91.5-96.6%). Different degree of hybrid pollen fertility decrease in comparison with paternal forms is noticed. F1 L.esculentum x L.hirsutum was remarkable for the most high fertility level (77.8%). The plants of this hybrid in the beginning of their growth were larger than parental species, but later the necrotic phenomena are to be observed and the plants were lost, although producing pollen had sufficient high fertility. This form of hybrid’s unviability occupies the one of important places in system isolating mechanisms between these species. The fertility of F1 L.esculentum x L.hirsutum var.glabratum was lower (69.3%), but in contrast to previous combination plants of F1L.esculentum x L.hirsutum var.glabratum presented heterosis effect. The hybrid F1 L.esculentum x L.cheesmanii had the most low fertility (55.0%). Perhaps, that decrease serves as a barrier of reproductive isolation between two self-compatible species. Thus, the influence of mating systems of crossing species on hybrid pollen fertility is noticed.
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1 - Institute of Botany NAS Republic of Armenia, Department of Systematic and Geography of Higher Plants, Avan-63, Yerevan, 375063, Republic of Armenia
Keywords:
Lycopersicon
hybrids
pollen fertility.
Session: Poster-119
Location: Ballroom CD/Monona Terrace
Date: Tuesday, July 25th, 2006
Time: 8:00 AM
Abstract ID:218 |
