Locus determining 1000 grains weight at high temperatures (Russian rice varieties)

Abstract

In Russia, increase in average air temperatures was noted in comparison with long-term data. Earlier it was shown that increase in average temperatures leads to a decrease in the productivity of plants for certain characteristics up to 90% and a yield of up to ten percent with an increase of 1 ° C. High temperatures above 30 ° C reduce the grain content, the total number and number of spikelets, weight grains from a plant, the mass of a thousand grains. A chromosomal region was established that reliably (at significance level 0.05) contributing to the formation trait mass of 1000 grains in domestic rice varieties in the region of localization of the RM 509 marker. A decrease significance level to 0.09 made it possible to identify another chromosome region with a possible localization of genes, determining the mass of 1000 grains at high temperatures. It is located in region of localization RM 13 marker. Four chromosomal regions have been identified that significantly contribute to the redistribution of plastic substances between grain and chaff under stress in domestic rice varieties on the first, fourth, ninth chromosomes (two loci) in the regions of localization of markers RM140, RM 261, RM 245, RM242 respectively.