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Chinese Agricultural Science Bulletin ›› 2025, Vol. 41 ›› Issue (1): 13-18.doi: 10.11924/j.issn.1000-6850.casb2024-0015

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Drought Resistance Evaluation of Different Maize Varieties During Germination and Seedling Stage Under PEG Simulated Drought Stress

XU Yilin(), XU Dongdong, ZHANG Panpan, ZHANG Yikang, LI Xianhua()   

  1. College of Life Science, Yulin University, Yulin, Shaanxi 719000
  • Received:2024-01-11 Revised:2024-04-15 Online:2025-01-05 Published:2025-01-01

Abstract:

In order to study the changes of germination index and physiological index of maize under PEG simulated drought stress, 20% PEG-6000 was set up for drought treatment. The germination rate, germination potential, germination index, radicle length, chlorophyll value (SPAD), superoxide dismutase (SOD) activity and malondialdehyde (MDA) content of maize at germination stage were measured, and the drought resistance of different varieties was evaluated by membership function method. The results showed that compared with CK, the germination rate, germination potential, germination index and radicle length of each maize variety decreased under drought stress, the chlorophyll value and SOD activity decreased, and the MDA content increased. The average value of the membership function of ‘Xinnong 008’ was greater than 0.7, which was a strong drought-resistant variety. The average value of membership function of ‘Zhongyu No.9’, ‘Zhongyu No.1’ and ‘Woyu No.3’ was less than 0.4, which belonged to weak drought-resistant varieties.

Key words: PEG simulated drought stress, corn, embryonic stage, seedling stage, physiological index, drought resistance, membership function method