| Six high-yield wheat varieties widely applicated in production were selected, to investigate the lodging resistance of different varieties comprehensively,by combining field and laboratory methods.The results showed that the lodging index of Bainong AK 58 was smaller as 0.432, and which was significant difference with others.The research found that the stem mechanical strength of Bainong AK58 was larger, its second internode was shorter and thicker, and its culm wall was thicker, as the secondary root number was more, and its plant height and height of center of gravity were lower than others.Correlation analysis showed that lodging index had close relationship with the characteristics of second stem, the thickness of second section of the mechanical strength, the thickness of culm wall, the dry-matter weight of second stem and the root numbers, which were the main determinants of the lodging resistance.Therefore,reducing the plant height appropriately could reduce the gravity height of plant, and enhance the capability of plant lodging resistance.Stepwise regression analysis showed that the direct factors influencing lodging resistance were the mechanical strength of second stem, the dry-matter weight of second stem, the root numbers and the fresh plant weight of above ground, the most direct action on stem lodging index were the mechanical strength of the second stem with the direct path coefficient of -0.775.So, the stem lodging resistance strength of wheat varieties could be evaluated through the mechanical strength of second stem. |
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