Optimal planting density is a core technology for ensuring rapeseed yield and production efficiency.However,exces-sive planting density can worsen lodging of rapeseed and make it challenging to achieve high yields.Leaves play a vital role in photosynthesis and dry matter accumulation in rapeseed,but the effects of different leaf types on yield and lodging resistance under high-density conditions remains unclear.In this study,we selected Zhongshuang 11 and implemented two planting densities(D3:4.5×105 plants hm-2,D5:7.5×105 plants hm-2)and four-leaf pruning treatments(CK:no leaf pruning,LP:pruning half of the long-petiole leaves,SP:pruning half of the short-petiole leaves,SL:pruning half of the sessile leaves).We aimed to investigate the effects of these three leaf types on the yield and lodging resistance of directly-sown rapeseed under high density,providing a theoretical basis for managing the source-sink relationship,high-density rapeseed cultivation,and the lodging challenge.The re-sults showed that,at the same density,the proportions of short-petiole leaf>long-petiole leaf>sessile leaf.When the density increased from D3 to D5,about 2 short-petiole leaves were reduced,resulted in a decrease in proportion from 50.6%to 46.7%.Leaf pruning at both densities lead to a reduction in siliques per plant,consequently decreasing the yield per plant and actual yield.Among the pruning treatments,SP had the greatest impact on yield.As density increased,the effect of SP on yield per plant in-creased from 19.61%to 37.67%,and the effect on actual yield increased from 13.65%to 22.03%.The lodging index increased under different leaf pruning treatments,with SP treatment significantly increasing the lodging index in both the upper and lower parts of the plant,indicating weaker lodging resistance.In addition,the root surface area and volume per plant decreased with increasing density,particularly under LP and SP treatments.Correlation analysis revealed that,under D3 density,pruning short-petiole leaves reduced the number of siliques per plant.Under D5 density,pruning short-petiole leaves and long-petiole leaves resulted in reduced siliques per plant and seed per silique,significantly decreasing both yield and lodging resistance.Prun-ing long-petiole leaves led to a significant decrease in root surface area and volume,which was unfavorable for yield formation.
关键词
高密度/长柄叶/短柄叶/根系/产量/抗倒性
Key words
high density/long-petiole leaf/short-petiole leaf/root system/yield/lodging resistance
维普
万方数据