高产优质两系杂交稻新品种Y两优919的综合评价

Comprehensive Evaluation of the Newly Two-line Hybrid Rice Variety Y-liangyou 919 with High-yield and Fine-quality

旨在评价长江中下游稻区新选育的中籼迟熟新品种Y两优919,满足市场对水稻新品种的需求。基于2018—2019年长江中下游稻区新选育的中籼迟熟新品种的区试与生产试验数据,利用相关性、主成分(PCA)与偏最小二乘判别分析方法(PLS-DA),综合评价Y两优919的农艺经济性状、主要病虫害抗性与品质。结果表明,与对照品种丰两优4号相比,Y两优919两年产量均显著提高,增幅分别达到8.03%和8.14%;同时2年各区试点产量变异系数较低,分别为1.61%和2.41%,表现出较好的丰产性与稳产性;Y两优919的病虫害抗性均优于各区试点对照品种,其米质更是达到部颁三等优质稻标准。此外,相关性、PCA与PLS-DA分析结果表明,产量为丰两优4号与Y两优919的关键差异性状。综上可知,Y两优919农艺经济性状、主要病虫害抗性与品质等综合表现优良,应进一步示范试验和推广应用。

The aim is to evaluate the newly selected new medium Indica late-maturing variety Y-liangyou 919 in the middle and lower reaches of Yangtze River rice region to meet the market demand for new rice varieties.Based on data from regional and production trials of newly selected new medium Indica late-maturing varieties in the middle and lower reaches of the Yangtze River rice region in 2018 and 2019,the correlation,principal component(PCA)and partial least squares discriminant analysis(PLS-DA)methods were applied to comprehensively evaluate the agronomic and economic traits,major pest and disease resistance and quality of Y-liangyou 919.The results showed that compared with the control variety Fengliangyou 4,the yields of Y-liangyou 919 were significantly higher in both years,with increment of 8.03%and 8.14%,respectively.Meanwhile,its yield coefficients of variation were low in both years,1.61%and 2.41%in each pilot zone,respectively,showing better yield and stability.Importantly,the pest and disease resistance of Y-liangyou 919 was better than that of the control variety in each district pilot,and its rice quality even reached the third grade quality rice standard of the Ministry.In addition,the results of correlation,PCA and PLS-DA analyses showed that yield was the key differential trait between Fengliangyou 4 and Y-liangyou 919.Above all,it could be concluded that Y-liangyou 919 had excellent agronomic and economic traits,major pest and disease resistance and quality,and should be further demonstrated and applied.