Analysis on yield composition and breeding strategy of winter rape varieties in the Yangtze River Basin
To improve efficiency of Brassica napus breeding,analysis were carried out for differences in agro-nomic traits and yield components of rapeseed in the Yangtze River Basin according to the national winter rapeseed test from 2018 to 2020.Results showed that in the upper area of the Yangtze River,density,plant height,seed num-bers per silique,seedlings growth and lodging resistance were significantly positively correlated with yield.Disease index was significantly negatively correlated with yield,and the maximum direct path coefficient of effective silique numbers per plant to yield was 0.665.In the middle area of the Yangtze River,plant height,seed numbers per si-lique,1000-seed weight,lodging resistance and seedling growth were significantly positively correlated with yield,and the number of effective silique numbers per plant had the largest direct effect on yield of 0.529,but disease in-dex and whole growth period were significantly negatively correlated with yield.In the lower area of the Yangtze Riv-er,yield was positively correlated with plant height,effective branch number,effective pod number,1000-seed weight,growth period and seedling growth,and the density and disease index were negatively correlated with yield.The 1000-seed weight had the greatest impact on yield in the lower area of the Yangtze River,and the direct path coefficient was 0.694.In breeding strategies,population selection should be strengthened,varieties with strong lodg-ing resistance and more seeds per silique should be strengtheneded in the upper-and middle-areas of the Yangtze River.1000-seed weight of rape should be increased under the condition of sufficient effective silique numbers per plant in the lower area of the Yangtze River.
万方数据
维普
