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[目的]确定耐低氮和氮高效水稻筛选指标。[方法]采用田间试验的方法,设正常供氮和低氮胁迫2个处理,对106个水稻株系在成熟收获期的株高、穗长、有效穗数、生物产量、单株产量、千粒重和结实率7个性状进行研究。[结果]结果表明,相对有效穗数、相对生物产量和相对单株产量(低氮胁迫/正常供氮)对低氮胁迫敏感大,且在株系间变异大(CV分别为21.97%,21.29%和22.13%);相关分析表明,相对株高与相对有效穗数、相对生物产量呈显著或极显著正相关,相对结实率与相对单株产量呈极显著正相关。株高、有效穗数、生物产量、单株产量和结实率可作为耐低氮和氮高效水稻材料的筛选指标。[结论]该研究结果为氮高效和耐低氮水稻筛选及新品种培育提供理论基础。
[Objective] The research aimed to determine the screening index of high and low nitrogen and nitrogen efficient rice. [Method] With two treatments of normal nitrogen supply and low nitrogen stress, the plant height, ear length, effective panicle number, biological yield, single plant yield, grain weight per thousand of 106 rice cultivars And seed setting rate of 7 traits. [Result] The results showed that the relative biological yield and relative per plant yield (low nitrogen stress / normal nitrogen supply) were relatively sensitive to low nitrogen stress and varied greatly among the lines (CV 21.97%, 21.29 % And 22.13% respectively). Correlation analysis showed that there was a significant positive correlation between relative plant height and relative effective panicle number and relative biological yield, and the relative seed setting rate was significantly and positively correlated with relative yield per plant. Plant height, panicles per panicle, biomass yield, yield per plant and seed setting rate could be used as screening indicators for rice materials resistant to low nitrogen and nitrogen. [Conclusion] The results of this study provide theoretical basis for screening high nitrogen and low nitrogen tolerant rice and cultivating new varieties.