Inheritance and combining ability analysis of productivity in F1 cotton diallel crosses
Valentina Dimitrova • Minka Koleva • Ana Stoilova
Institute of field crops - Chirpan, 6200, Chirpan, Bulgaria
Резюме
The inheritance and combining ability of parental forms in two cotton diallel
crosses were studied. The first diallel cross included the varieties: „Beli Iskar”,
„Barut 2005”(Turkish); „Darmi”, „Mytra” (Greek), „Helius” and „Dorina” and the
second one - the varieties: „Chirpan-539”; „Helius”, „Rumi”, „Boyana”, „Natalia”
and „Nelina”. In the first diallel cross, crosses with positive over-dominant
inheritance of productivity have predominated. Over-dominance in these crosses
caused heterosis, which reached 22.0%, on average for two years. In the second
diallel cross, the inheritance of productivity in 40% of the crosses was positively
over-dominat, while another 40% demonstrated incomplete dominace of the more
productive parent. Heterosis manifestations were less pronounced (up to 17.7%).
The significant positive values of the GCA were found for the varieties „Beli Iskar”
(1st diallel cross) and „Natalia” (2nd diallel cross), have showed high yield/plant.
The presence of positive GCA in some of the parental forms depended on the year
conditions. Positive and significant SCA effects were found in both diallel crosses.
The analysis of the variance components of the GCA and SCA showed that non-additive
gene effects were important for inheritance of productivity.
