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Acta Agron Sin ›› 2013, Vol. 39 ›› Issue (12): 2253-2261.doi: 10.3724/SP.J.1006.2013.02253

• RESEARCH NOTES • Previous Articles     Next Articles

Effects of Artificial Shaded-Humid Environment on Growth Characteristics in Different Maize Inbred Lines

YAN Qing-Jiu,HUO Shi-Ping*,ZHANG Fang-Kui,ZHANG Xing-Duan,ZHANG Jian,XIANG Zhen-Fan,YU Zhi-Jiang,FENG Yun-Chao   

  1. Chongqing Three Gorges Academy of Agricultural Science, Chongqing 404155, China
  • Received:2013-02-24 Revised:2013-07-25 Online:2013-12-12 Published:2013-10-01

Abstract:

Light deficiency and high humidity are important limiting factors resulting in stunted plant, lower production and poorer grain quality of maize (Zea mays L.) in southwest China. It could be an effective way for solving this problem to group with new maize hybrids by evaluating and selecting maize breeding materials with tolerance to shaded-humid environment. During 2011–2012, thirty maize inbred lines were tested and compared under the natural environment and the artificial by simulated shaded-humid environment at the same time. The results showed that the relative humidity of air increased significantly, theillumination intensity and photon decreased very significantly, but the air temperature changed little under the shaded-humid environmentresulting in that the effective functional leaves, tassel branches, plant height, ear height, 100-kernel weight, individual kernel weight, stem diameter, ear diameter, ear length and kernel number per row of inbred lines reduced; the interval from anthesis to silking (ASI) prolonged, the 7th leaf length, 7th leaf length-width ratio and sheath blight index became bigger, with highly significant differences  between two environments. The tested traits varied significantly among different inbred lines also, but not among different years. The results of principal component analysis indicated that the contribution ratio of accumulated variance of the seven main components reached 85.08%. According to the evaluating values (D), which computed by the comprehensive index values and subordinative function values, the thirty inbred lines could be divided into three groups with strong, middle and less tolerance to shaded-humid environment respectively.The stepwise regression analysis showed that the characters influencing the comprehensive values (D) significantly were the 7th leaf length, number of tassel branches and individual kernel weight. The correlation coefficient of linear regression equation was 0.896**, which suggested that we could identify and select maize breeding materials with tolerance to shaded-humid environment based on these character indices.

Key words: 玉米, 自交系, 荫湿, 指标

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