优质籼型水稻品种Y两优4299的综合评价OA

In this study,Y Liangyou 4299 was used as the test variety.A completely randomized block design was adopted,and regional trials were conducted at 17 experimental sites in the middle and lower reaches of the Yangtze River from 2021 to 2022.Indicators such as yield,agronomic traits,disease and pest resistance,and rice quality were measured.Comprehensive evaluation was performed using t-test,coefficient of variation,principal component analysis,partial least squares discriminant analysis,and correlation analysis.The results showed that Y Liangyou 4299 was superior to the control variety Fengliangyou No.4 in most agronomic traits,including average effective panicle number.The average yields of Y Liangyou 4299 in 2021 and 2022 were 655.39 and 674.91 kg/667 m²,respectively,representing yield increases of 5.58%and 8.18%compared with the control.The coefficients of variation for yield and agronomic traits ranged from 4.43%to 11.51%and from 3.85%to 12.87%,respectively.Disease and pest resistance identification indicated that the variety was resistant to rice blast,moderately susceptible to bacterial blight,and highly susceptible to brown planthopper.Rice quality analysis showed that the quality grades of Y Liangyou 4299 reached Grade 3 high-quality rice in 2021 and Grade 2 in 2022.Correlation analysis indicated that thousand-grain weight was negatively correlated with yield,and this trait was identified as a key factor causing the difference between Y Liangyou 4299 and Fengliangyou No.4.In summary,Y Liangyou 4299 exhibits excellent performance in high-yield potential,yield stability,and blast resistance,with strong adaptability and certain promotion potential.