Pleiotropic Effects of Gibberellin Sensitive and Giberrellin Insensitive Dwarfing Genes in Bread Wheat of the Southern Step Region of the Black Sea
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Дата
2016
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Анотація
Investigation of the pleiotropic effects of GA sensitive (Rht8) and GA insensitive (Rht B1 and Rht D1)
winter bread wheat dwarfing genes and the gene that determines the response of plants to photoperiod—
Ppd D1—were carried out for 3 years in the southern step region of the Black Sea bank on five different genetic
backgrounds. It is shown that, in addition to direct effects on plant height, GA sensitive and GA insensitive dwarf
ing genes have pleiotropic effects on all studied traits except the number of fertile spikelets. Presence of the dwarfing
genes in the genotype of tall forms led to the decrease of stem and ear length, and, at the same time, to the increase
of ear density. The number of spikelets per spike decreased due to sterile spikelets, whereas the number of fertile
spikelets did not change. There was a significant increase in the number of grains per ear as a result of increasing
of spikelets in ears. The number and weight of grains did not decrease, even though the plants were charac
terized by a smaller number of productive tillers. The presence of Rht8x allele on genetic background of vari
ety Stepnyak resulted in a significant decrease of plants productivity. However, in combination with Ppd D1a
allele, plants with Rht8x increased the potential productivity and surpassed the parental form (Rht8x Ppd D1a).
The presence of Rht Ble allele resulted in reduction of weight of kernels from the main ear and 1000 kernels
weight, increase of l/h, and left the number of seeds per spikelet stable in comparison with Rht8x.
Опис
Ключові слова
winter bread wheat, dwarfing genes, photoperiod sensitivity genes, quantitative traits
Бібліографічний опис
Cytology and Genetics