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《Acta Agrestia Sinica》 2003-02
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Study on the Moisture Physiology and Drought Resistance of Ceratoides Seeds

YI Jin 1,WANG Xue min 1,GU An lin 2,XU Jun 1 (1.Inner Mongolia Agricultural University, Huhhot 010019,China; 2.Grassland Research Institute; Chinese Academy of Agricultural Sciences, Huhhot, Inner Mongolia Autonomous Region 010010,China)  
A study on the moisture physiology and drought resistance of the seed and seedling of 7 Ceratoides samples, of 3 species, shows that the seeds are highly absorbent and need large amount of water for germinating, amounting to 4～7 times the net weight of a seed. The absorbability of different species and ecotypes varies. The absorbing capacity of the germinating seed is negatively correlated to the quantity of the local precipitation, but positively correlated to the weight of the seed bracts. A sample seed that germinates in adverse conditions is often densely puberulent and highly absorbent. Its speed of imbibition is negatively correlatd to the seed vigour the higher the speed of imbibition, the lower the seed vigour. Though Ceratoides plants are drought resistant, the seedlings lack drought tolerance, as they need large amount of water to grow, and contain little biomass,the genetic shortcomings that are developed from malnutrition and ephemerality. To sum up,water supply technology is key to the production and exploitation of Ceratoides .
【Key Words】： Ceratoides Seed Moisture physiology Drought resistance
【Fund】： 国家自然科学基金“驼绒藜属牧草种子生物学特性的研究”(项目编号 :C3 9960 0 10 )资助
【CateGory Index】： S54
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