Meeting the demand for high-quality japonica rice is a major challenge facing China's grain security. In the present study, a two-year field experiment was conducted to investigate the yield, quality, and profitab...Meeting the demand for high-quality japonica rice is a major challenge facing China's grain security. In the present study, a two-year field experiment was conducted to investigate the yield, quality, and profitability of japonica rice varieties(including hybrids and inbreds) grown in the late season as compared with local elite indica hybrids in a double rice cropping system of China where indicas are traditionally planted. Indica hybrids had significantly longer vegetative(from sowing to heading) and total(from sowing to maturity) growth durations than japonicas in both2011 and 2012, while reproductive growth duration(from heading to maturity) was longer for indica hybrids than for japonicas in 2011 but not in 2012. Indica hybrids produced higher grain yield than japonicas in 2011, but with no significant differences in 2012. Japonicas had higher brown rice, milled rice, and head rice percentages than indicas, but had lower gelatinization temperature and amylose content,while with no significant differences in gel consistency and protein content. Indica hybrids tended to have lower chalky grain percentage and chalkiness degree than japonicas, though the differences were not statistically significant due to large genotypic variations. The net returns were 16.1% and 9.9% greater for indica hybrids than for japonica hybrids and japonica inbreds in 2011, with only 3.8% and 1.3% in2012, respectively. Thus, our results suggest that replacing indicas with japonica varieties as late rice may not be feasible at the present site unless locally adapted japonica varieties are developed.展开更多
A comprehensive appraisal is performed on the newly bred of 28 hybrid middle-season rice combinations, with Yangliangyou 6 as a control, a total of 29 combinations, in terms of high and stable yield, adaptability and ...A comprehensive appraisal is performed on the newly bred of 28 hybrid middle-season rice combinations, with Yangliangyou 6 as a control, a total of 29 combinations, in terms of high and stable yield, adaptability and disease resistance. Two-line hybrid combinations have a total of 24, accounting for 82.76% of the exhibition, but there were only 5 three-line hybrid combinations have accounting for 17.24% of the exhibition. There are 13 high-quality two-line cross combinations, representing 54.17% of the two-line hybrid combinations. In the 8 hybrid combinations, whose yield per unit area is more than that of the control, 7 are two-line hybrid combinations, and the last one is the three-line hybrid combination. There are 15 two-line hybrid combinations with whole growth period 10 d shorter than Yangliangyou 6.展开更多
基金Supported by grants from the China National Rice Research Institute and Jiangxi Province(GJJ12215 and 555 Talents Program)
文摘Meeting the demand for high-quality japonica rice is a major challenge facing China's grain security. In the present study, a two-year field experiment was conducted to investigate the yield, quality, and profitability of japonica rice varieties(including hybrids and inbreds) grown in the late season as compared with local elite indica hybrids in a double rice cropping system of China where indicas are traditionally planted. Indica hybrids had significantly longer vegetative(from sowing to heading) and total(from sowing to maturity) growth durations than japonicas in both2011 and 2012, while reproductive growth duration(from heading to maturity) was longer for indica hybrids than for japonicas in 2011 but not in 2012. Indica hybrids produced higher grain yield than japonicas in 2011, but with no significant differences in 2012. Japonicas had higher brown rice, milled rice, and head rice percentages than indicas, but had lower gelatinization temperature and amylose content,while with no significant differences in gel consistency and protein content. Indica hybrids tended to have lower chalky grain percentage and chalkiness degree than japonicas, though the differences were not statistically significant due to large genotypic variations. The net returns were 16.1% and 9.9% greater for indica hybrids than for japonica hybrids and japonica inbreds in 2011, with only 3.8% and 1.3% in2012, respectively. Thus, our results suggest that replacing indicas with japonica varieties as late rice may not be feasible at the present site unless locally adapted japonica varieties are developed.
基金Supported by Wuhan Experimental Station of National Rice Industry Technology System(CARS-01-63)Hubei Key Research and Development Technology Program(2014ABA021)National Agricultural Science Technology Achievement Transformation Fund(2014GB2D100579)~~
文摘A comprehensive appraisal is performed on the newly bred of 28 hybrid middle-season rice combinations, with Yangliangyou 6 as a control, a total of 29 combinations, in terms of high and stable yield, adaptability and disease resistance. Two-line hybrid combinations have a total of 24, accounting for 82.76% of the exhibition, but there were only 5 three-line hybrid combinations have accounting for 17.24% of the exhibition. There are 13 high-quality two-line cross combinations, representing 54.17% of the two-line hybrid combinations. In the 8 hybrid combinations, whose yield per unit area is more than that of the control, 7 are two-line hybrid combinations, and the last one is the three-line hybrid combination. There are 15 two-line hybrid combinations with whole growth period 10 d shorter than Yangliangyou 6.
