| Selection and comprehensive evaluation of drought resistance identification indicators in millet germplasm resources |
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| DOI：10.7606/j.issn.1000-7601.2025.05.02 |
| Key Words: millet germplasm resources drought resistance indicators drought\|resistant variety selection |
| Author Name | Affiliation | | LI Zhe | State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Northwest A & F University, Yangling, Shaanxi 712100, China
College of Resources and Environment, Northwest A & F University, Yangling, Shaanxi 712100, China | | GUO Shuqing | State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Northwest A & F University, Yangling, Shaanxi 712100, China | | FAN Zihan | State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Northwest A & F University, Yangling, Shaanxi 712100, China
College of Resources and Environment, Northwest A & F University, Yangling, Shaanxi 712100, China | | LI Hongbing | State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Northwest A & F University, Yangling, Shaanxi 712100, China | | ZHANG Suiqi | State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Northwest A & F University, Yangling, Shaanxi 712100, China |
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| Abstract: |
| Based on 30 varieties of foxtail millet, drought resistance identification and evaluation were carried out. During the seedling stage, two treatments, drought stress (20% PEG+Hoagland’s nutrient solution) and control (Hoagland’s nutrient solution), were set up in a hydroponic experiment, while two treatments, normal irrigation (supplementary irrigation) and drought stress (natural precipitation), were set up in the field experiment. Morphological and physiological indicators at the seedling stage were measured to classify drought resistance levels and screen drought tolerance indices. These were integrated with yield and water use efficiency at the maturity stage to select high\|yield, drought\|resistant varieties suitable for major foxtail millet production regions.The results showed that the morphological and physiological indicators of foxtail millet seedlings show significant responses to drought stress. Under drought stress conditions, the decrease in morphological parameters was as follows: fresh underground mass (60.14%) > fresh aboveground mass (54.99%) > dry underground mass (42.82%) > dry aboveground mass (38.54%) > seedling length (26.97%) > root length (20.9%). Physiological indicators generally increased except for chlorophyll content, with the following trends: proline content (448.13%) > soluble sugar content (224.26%) > malondialdehyde content (114.8%). Principal component analysis (PCA) converted 10 indicators into 4 principal components. Based on D values, cluster analysis categorized the 30 varieties into 4 drought\|resistant groups, with Longgu 12, Longgu 32, Zhangzagu 19, and Longgu 10 classified as highly drought\|resistant. The results of stepwise regression analysis indicated that five indicators, including fresh aboveground mass, dry underground mass, chlorophyll content, proline content, and malondialdehyde content, can be used as key indicators for identifying drought resistance in foxtail millet at the seedling stage. By identifying drought resistance during the seedling stage and analyzing field yield and water use efficiency, two high\|yield and drought\|resistant varieties, Zhangzagu 19 and Longgu 32, were determined to be suitable for promotion and planting in the main production areas of foxtail millet. |
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