Study on Identification of Drought-Resistant and Physiological Mechanism of High-Yield Maize Germplasm

doi:10.3321/j.issn:1000-7091.2007.02.025

Abstract

Abstract: Fourteen maize cross lines were selected in order to study the index of droughtresisrance indentification and the mechanism in germinating, seedling and maturity period. The seed germination index (GSI), physiological traits and drought resistance index (DRI) and their ralationship were analyzed. The results showed that the cultivars had high DRI which the water potential and osmotic potential were high in normal condition, and the decreasing rate were high in water potential and low in osmotic potential under osmotic stress. To cultivars which had low POD activities and high proline content in normal condition, and increasing rate were high in POD activities and low in proline content, their DRI were high too. In generally, if some cultivars had lower MDA in normal condition, their DRI were higher. In conclusion, it's consistent among GSI, water potential, osmotic potential, POD activity and DRI. These explained the difference of drought-resistance of maize cultivars in machanism.

Key words: Maize, Drought-resistant, Identification, Physiological mechanism, High-yield

CLC Number:

S513.01

GUO Xiu-lin, LIU Zi-hui, LI Qiu-sheng, ZHANG Wen-ying, XIE Jun-liang, LI Yu-qin. Study on Identification of Drought-Resistant and Physiological Mechanism of High-Yield Maize Germplasm[J]. ACTA AGRICULTURAE BOREALI-SINICA, 2007, 22(2): 101-105. doi: 10.3321/j.issn:1000-7091.2007.02.025.

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