Response of promising rice CSSL IAS66 and its parents under different nitrogen levels
2019
Hanh, N.H. | Cuong, P.V. | Hanh, T.T. | Hoan, N.V.
Pot experiments were conducted on rice to estimate the relationship among dry weight, translocation of non-structural carbohydrates (NSC), and grain yield in IAS66, a chromosome segment substitution line (CSSL) derived from a cross between the indica cultivar IR24 and the japonica cultivar Asominori, in comparison with its parental cultivars (IR24 and Asominori) under non-nitrogen (N0), normal nitrogen (N1), and high nitrogen (N2) conditions in the spring season 2017 in a greenhouse at the Faculty of Agronomy, Vietnam National University of Agriculture, Vietnam. Increasing the nitrogen level increased the photosynthetic rate in terms of the CO2 exchange rate (CER) and leaf area, which lead to both greater dry weight and NSC transportation from culms and leaves sheaths (stem) to panicles in all genotypes. However, the rate of increase in dry weight and NSC in the panicles at the maturing stage observed in IAS66 was higher than that in its parental cultivars. As nitrogen increased from the N1 to N2 levels, the grain yield significantly increased because the number of panicles per plant increased, but the other yield components including the number of spikelets per panicle, grain-filling, and 1000-grain weight were not significantly different. Grain yield of IAS66 was 11.4% higher than that of the recurrent parent IR24 at the same high nitrogen levels and the rate of grain yield increase in IAS66 was significant higher than that of its parental cultivars.
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