Studies on variences of the lodging-resistant ability and the mechanism in different maize varieties.

In this study, the differences of morphology of stem and roots, dry weight and physiological property of corn varieties with different lodging-resistance capability were studied systematically to reveal the mechanism of corn lodging and provide theory basis for high yield with lodging-resistant corn cultivation and breeding. On 28th August,2012,there was a" Bolaven" typhoon attacked middle west part of Jilin Province, and lots of aces corn fell over. Research group went to survey the characters and rate of lodging in the 11 mian corn varieties( Liangyu99, Liangyu88, Liangyu66, Nonghua101, Dika516, Jidan50, Xianyu335, Zhengdan958, Limin33, Yinhe32 and Yinhe33) after the typhoon. The lodging of maize was investigated and the morphology, dry matter and physiological characteristics of stalk and root were measured, and the variances of different variety and effects of lodging on yield were analysed. The field investigation showed that most of corn varieties except 'Liangyu99' were in the lodging and the rate of lodging was almost 100%. The stalk below the ear in 'Liangyu99' had the following features the lower coefficient of ear-height, the shorter internode, the bigger diameter, the higher ratio of dry weight to the length, and the stalk strength from 1st to 3rd internode above base were the highest and the number of brace root was the most in all maize varieties. In the aspect of physiological characteristics, the content of soluble sugar, ligin, Si and Zn of all internodes below the ear in' Liangyu99' and' Zhengdan958' were higher significantly than others, and those of' Yinhe32' and' Yinhe33' were the lowest. There was significant difference in the Ca and Mg content of all varieties, and the content of cellulose, N, K of 'Yinhe32' and' Yinhe33' were lower than others. The yield of' Liangyu99, was far lower than yield of' Xianyu335' and' Zhengdan958'. The yield of' Zhengdan958' was not sensitive to lodging in the filling stage. 'Liangyu99' showed great characters of both over ground and under ground which make it show great capability of lodging resistance when facing the natural hazard, while the yield only lie in the middle level. When choosing the corn varieties with lodging resistance, both morphological and physiology indexes should be taken into consideration synthetically, and rational close planting and fertilization should be applied to decrease the risk of lodging and guarantee the yield potential. [ABSTRACT FROM AUTHOR]