| Study on drought resistance of import alfalfa varieties under water stress in the semiarid areas and semiarid areas liable to drought of Ningxia |
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| DOI：10.7606/j.issn.1000-7601.2008.05.15 |
| Key Words: Southern Ningxia mountain region varieties of Medicago sativa water stress drought resistance selection of plant species |
| Author Name | Affiliation | | LI Yongping | Guyuan Institute of Agricultural Sciences, Guyuan, Ningxia 756000 | | LIU Shixin | Guyuan Institute of Agricultural Sciences, Guyuan, Ningxia 756000 | | JIA Zhikuan | Agricultural Research Center in Arid and Semiarid Areas, Northwest A & F University, Yangling, Shaanxi 712100 | | LIU Peisong | College of Resources and Environment, Northwest A & F University, Yangling, Shaanxi 712100, China | | LI Mingfang | Guyuan Institute of Agricultural Sciences, Guyuan, Ningxia 756000 | | CAO Xiuxia | Guyuan Institute of Agricultural Sciences, Guyuan, Ningxia 756000 |
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| Abstract: |
| The physiological indices of drought resistance in the seedling stage of 14 selected alfalfa (Medicago sativa) varieties were investigated for three years under three different kinds of site sections in the semi-arid prone to drought areas, including gently sloping farmland, arid plowland and arid plain land, and different water stresses of rainfall and supplementary irrigation. The results indicated that the rates of water loss in alfalfa leaves during water loss stages was the highest in treatment with supplementary irrigation, followed by treatment in dryland, and then treatment in gently sloping farmland. The correlation analysis of multi-physiological indices of drought resistance indicated that there were significantly negative correlations between the rates of water loss of alfalfa detached leaves (RWL) with water holding capacity (HAW) and drought resistance index (ID), and significantly positive correlations between water holding capacity (HAW) and drought resistance index (ID). The multivariate regress forecast and clustering analysis among the main drought resistance indices identified the drought resistance types and adaptability region of different alfalfa varieties, which were further validated in the production under different ecological regions. |
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