2002•Unpublished venueRequires access
Response of Some Agronomic Traits to Cold Selection at Seedling Stage in Rice
Han Long
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Abstract
Three combinations (Milyang 23/Tong 88 7, Milyang 23/TR22183, Milyang 23/Gaochan 102) between indica and japonica rice cultivars were used to analyze responses of some agronomic traits to cold selection at seedling stage. Cold water responses of selected individuals or lines for higher seedling cold tolerance to some agronomic traits were compared with those of unselected individuals or selected lines for lower seedling cold tolerance in F 2 and F 3 generations. There was no significant difference in culm length, panicle length and panicles per plant between the selected and unselected F 2 individuals by leaf discoloration at seedling stage through cold treatment, but spikelet fertility under cold water irrigation in the selected population by seedling cold tolerance was significantly higher than that in the unselected. The selection by cold tolerance at seedling stage in F 3 lines generally led to increase both cold tolerance for leaf discoloration at tillering stage and seed setting rate under cold water irrigation. Grain yield of F 3 lines selected for high seedling cold tolerance was much higher than that of lines selected for low seedling cold tolerance under cold water irrigation.