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Journal of Agriculture ›› 2023, Vol. 13 ›› Issue (4): 9-17.doi: 10.11923/j.issn.2095-4050.cjas2022-0016

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New Wheat Varieties (Lines) in Dry and Fertile Land in Huang-Huai Wheat Area: Preliminary Identification and Classification of Drought Resistance at Seedling Stage

SUN Xianyin(), MI Yong, MU Qiuhuan, LV Guangde, QI Xiaolei, SUN Yingying, YIN Xundong, WANG Ruixia, WU Ke, QIAN Zhaoguo()   

  1. Tai'an Academy of Agricultural Sciences, Tai'an 271000, Shandong, China
  • Received:2022-02-28 Revised:2022-08-15 Online:2023-04-20 Published:2023-04-18

Abstract:

Understanding the drought resistance of new water-saving wheat varieties in dry and fertile land of Huang-Huai wheat area is conducive to wheat variety popularization and breeding. Under the condition of simulated drought stress with 15% PEG-6000 (polyethylene glycol) solution, 50 wheat varieties (lines) of recent years were used as experimental materials to measure the changes of seed germination rate, seedling height and chlorophyll content, and to evaluate and classify the drought resistance. The results showed that wheat seed germination rate and seedling height were significantly correlated with drought resistance at seedling stage under the stress. The 50 materials were divided into 4 categories, including 4 highly drought resistant germplasms (D value of 0.8255-0.9980), 10 drought resistant germplasms (D value of 0.6516-0.7270), 28 drought sensitive germplasms (D value of 0.4941-0.6354), and 8 highly drought sensitive germplasms (D value of 0.3079-0.4676). Compared with using average membership function value to evaluate the drought resistance, the classification results could be reasonably and intuitively presented by using the D value evaluation combined with the longest distance system cluster analysis. Therefore, the experiment confirmed that under the stress of 15% PEG-6000, the germination rate and seedling height of wheat could be used as the main indicators to evaluate the drought-resistance ability at seedling stage. The drought resistance of the 50 varieties (lines) was distinguished, which could provide a basis for the selection and promotion of drought-resistant and water-saving varieties.

Key words: wheat, dry and fertile land, seedling stage, drought resistance, cluster analysis