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在穗分化期和开花期采用切根方法 ,研究了土表 15 cm和 30 cm以下根系对杂交水稻组合 6 5 0 0 2和汕优 6 3的生长和产量及其构成因子的影响。与对照相比 ,在穗分化期切断土表 15 cm处根系 ,6 5 0 0 2和汕优 6 3穗长分别下降 2 .7和2 .4 cm,每穗总粒数下降 36 .0 %和 2 6 .6 % ,对结实率影响不大 ;切断土表 30 cm处根系 ,对穗长影响较小 ,每穗总粒数分别下降 17.2 %和 7.8% ,结实率下降 11.7%和 5 .8%。开花期切根使结实率显著降低 ,切断 15 cm处根系使 6 5 0 0 2和汕优 6 3的结实率分别下降 17.2 %和 11.8% ,切断 30 cm处根系使结实率下降 14 .4 %和 7.3%。切根对大穗型品种籽粒产量的影响大于对小穗型品种的影响 ;在穗分化期切根的影响大于开花期。穗分化期切根对叶绿素含量的影响以倒 3叶最显著。穗分化期和开花期切根还显著降低了倒 1叶的光合强度
The effects of root system with 15 cm and 30 cm soil depth on the growth and yield of hybrid rice lines 6 5002 and Shanyou 6 3 and its components were studied using the method of root cutting in the stages of spike differentiation and flowering. Compared with the control, the spikelet length at 15 cm cut off in soil table during spike differentiation was decreased by 2.7 and 2.0 cm, and the total grain number per panicle decreased by 36.0% And 26.6% had little effect on the seed setting rate. Cutting off the root at 30 cm showed less effect on the spike length. The total grain number per panicle decreased by 17.2% and 7.8% respectively, while the seed setting rate decreased by 11.7% and 5% respectively. 8%. The seed setting rate at the flowering stage was significantly reduced, the seed setting rate at 65 cm and the Shanyou 63 cuttings were reduced by 17.2% and 11.8% respectively at the 15cm, and the seed setting rate decreased by 14.4% And 7.3%. The effect of cutting root on the grain yield of big spike type was greater than that on spikelet type. The effect of cutting root in spike differentiation was greater than that in flowering stage. The effect of cutting root on the chlorophyll content in ear differentiation stage was the most significant in inverted leaf. The cuttage of flowering and spike differentiation also significantly reduced the photosynthetic rate of the next leaf