论文部分内容阅读
五十年代以来,本省中籼稻产量翻了一番多,历经两次飞跃。一是从早期地方品种过渡到中期矮杆品种,增产80.04％;二是由中期矮杆品种过渡到杂交水稻,增产15.54％。产量因素的变化主要表现为每穗总粒数的增加,每穗总粒数与产量有较高的遗传相关,是产量提高的主导因素。植株高度呈高杆—矮杆—中矮杆—中杆的趋势变化。叶片的直立性、光合作用强度、根系活力、抗倒力及收获指数,中、近期品种均较早期品种明显提高。生物量的变化与稻谷产量的变化趋势一致。净同化率。分蘖力等变化不大。故今后中籼稻高产品种的选育,应以中杆大穗类型为主。
Since the 1950s, the province’s mid-season indica rice output more than doubled, after two leaps. First, the transition from early local varieties to medium-term dwarf varieties, an increase of 80.04%; Second, the medium-term dwarf varieties of hybrid rice transition to an increase of 15.54%. The change of yield factors mainly showed that the total grain number per panicle increased, and the total grain number per panicle had a higher genetic correlation with grain yield, which was the dominant factor of yield increase. Plant height showed high rod - dwarf - dwarf - mid-pole trend changes. Leaf upright, photosynthetic intensity, root activity, anti-pound force and harvest index, medium and recent varieties were significantly higher than the early varieties. The change of biomass is in line with the trend of paddy production. Net assimilation rate. Tillers and other little change. Therefore, the future breeding of high-yielding varieties of indica hybrid rice should be the main type of large-spike pole.