Effects Of Water Stress On Physiological Biochemistry,Mineral Element And Leaf Apparatus's Ultrastructure Of Almond Rootstocks

The potted plants of A.persica ,Amygdalus communis L. were used for the experiments.Set 5water stress condition. Water supply was controlled and treated about10,20,30 days and rewatered by the weight method in potted mulberry under the rainproof awning, to study systemically the changes of the growth, the osmosis adjustment, the protection enzyme activity, ultrastructure of nutritional organs and. Fe,Ca,Mg,K contents. The results showed:1) With longer water stress, the growth and accumulation of dry matter of A.persica and Amygdalus communis L. was the fastest when the soil relative water content is 80%.The growth and accumulation of dry matter of A.persica and Amygdalus communis L. was restrained when the soil relative water content is 40% and 20%.But both of them still kept on growing the biomass weight. They resumed to growth after rewatering, moreover displayed the certain compensating growth effect. The growth and accumulation of dry matter of Amygdalus communis L. was obviously restrained than A.persica.2) Along with the increasing time and degree of water stress, the chla+b and chla content of A.persica and Amygdalus communis L. decreased. The content of Chlb had unregular pattern. The Chla was sensitiver than the Chlb. The chla+b and chla content of Amygdalus communis L. went down fastter than A.persica under water stress .3) Along with the increasing time and degree of water stress, the leaf relative water content decreased; the soluble sugar content and Proline content increased; the cell membrane penetrability increased. Soluble protein showed the variation tendency. A.persica of soluble protein decreased, Amygdalus communis L. of soluble protein increased. Protective enzyme activities showed the variation tendency; Superoxide dismutase activities increased, Peroxidase activities decreased.4) Along with the increasing time and degree of water stress, Fe,Ca,Mg,K contents of A.persica and Amygdalus communis L. had different change. Fe,Ca,Mg,K contents of root,stem and leaf had different change too.They illustrated that the different element had different change under water stress;that the same element had different change in different variety under water stress;the element in the different organ of Almond rootstock had fifferent change under water stress.5) When the soil relative water content is 80%, the chloroplast and mitochondria cristae were regular. When the soil relative water content is 100%and 60%, the chloroplasts became roud in shape.There were bigger giqantic starch grains and fat droplets in the chloroplasts. Mitochondria cristae became swollen. When the soil relative water content is 40%and 20%, thylakoids became swollen and disorder in leaf cell, mitochondria cristae became obscured .6) Rewatered, the leaf relative water content of A.persica and Amygdalus communis L.were increased. The suloble suger content was decreased.The Proline content and suloble protein of A.persica were increased than 30d of water stress's. The Proline content and suloble protein of Amygdalus communis L.were decreased.7) Through this study, we primary came to the conclusions that water stress-resistance ability of A.persica. is higher than Amygdalus communis L. A.persica and Amygdalus communis L had different change on Mineral Element under water stress. Ultrastructure of nutritional organs had gravely destroy under water stress...