粳稻根系性状与植株产量及其构成因素的关系

Relation of Root Characters with Plant Yield and Its Components of Japonica Rice

通过盆栽试验,研究了粳稻根系性状与植株产量及其构成因素的关系。结果表明,粳稻根系总吸收面积、根体积、活性吸收面积、单株根系氧化力、伤流速度和根数与产量相关显著,并且显著时期集中在孕穗期至灌浆中期。其中,总吸收面积在孕穗之后一直对产量起作用,根体积、伤流速度与活性吸收面积在孕穗至灌浆前期、根数与单株根系氧化力在灌浆期对产量具有显著影响。而根干质量与总根长在水稻生长前期与单株产量的相关性较小。根系主要性状与结实率,一、二次枝梗数,一、二次枝梗粒数,一、二次枝梗粒重呈显著正相关,与穗长相关性较小,与有效穂数呈负相关。

The relation of root characters with grain yield and its components of Japonica rice was studied in a pot experiment.The results showed the root absorption area,root volume,root oxidizing ability per plant,root sap bleeding and root number had significant relation with grain yield,especially from booting stage to middle filling stage.The total root absorption area had the most significant effect on yield.The root volume,root sap bleeding and root active absorption area had significant effect on yield from booting stage to early filling stage.The root number and root oxidizing ability per plant had greatly effect on yield during grain-filling stage.But the root dry weight and total root length had little correlation with grain yield during early growing stage.The main root traits had significantly positive correlation with seed setting rate,number of primary and secondary branches,and grain weight,but had negative correlation with effective panicles.The correlations of root traits with grain weight and panicle length were not significant.