Morphosis of Lodging Resistance in Different Rice Cultivars

The lodging index and stem intension in rice were analyzed by correlation analysis method to confer the relationship between the rice culm traits and lodging resistance by using 103 rice varieties released in the past 50 years.The results showed that plant height,basal internodes cross-sectional area and Top 1,Top 5 internodes were the main factors concerning rice lodging resistance and the ratio of Top 1,Top 4 and Top 5 to plant height also significantly correlated with the lodging index and stem intension.Under the same plant height,a good rice variety with lodging resistance has shorter length of Top1,larger area of basal stem cross-section area and shorter length between Top 4 and Top 5 but more ratio of the length to plant height.