水稻稻曲病不同病情指标间关系研究

Relationship among different disease indicators of rice false smut

以120个湖南省水稻区域试验新组合(品系)为材料,调查、统计稻曲病发生危害水平,分析不同病情指标之间的关系。直线相关分析发现,稻曲病病蔸率、病穗率、平均每穗病粒数及病情指数两两之间均呈极显著正相关关系。病穗率与病情指数之间的相关系数为0.986,田间调查以病穗率为评价指标,既简便准确,还能通过回归方程进行数据转换。病穗率(x)与病情指数(y)间回归方程为y=0.343x-0.441(1.29<x≤100),平均每穗病粒数(x)与病情指数(y)间回归方程为y=10.965x+0.691(x>0),病穗率(x)与平均每穗病粒数(y)间回归方程为y=0.029x-0.078(2.67<x≤100),可用于数据转换及资料比较。

In order to clarify the relationship among different disease indicators of rice false smut （RFS）, the oc- currence and damage of RFS on 120 new indica combinations （lines） from Hunan Rice Regional Trial were inves- tigated and analyzed. Linear correlation analysis showed that diseased hill rate （DHR）, diseased panicle rate （DPR）, the average diseased grains per panicle （ADGPP） and disease index （DI） were significantly positively cor- related with each other. The correlation coefficient between DPR and DI was up to 0. 986. The DPR was a con- venient and precise indicator for RFS evaluation. The regression equation between DPR （x） and DI （y）, ADGPP （x） and DI （y）, and DPR （x） and ADGPP（y） were y=0. 343x-0. 441 （1.29〈x≤100）, y=10. 965x＋0. 691 （x〉0） and y=0. 029x -0. 078 （2.67〈x≤100）, respectively, which can be used for data conversion and data comparison.