Effects Of Calcium On The Drought Resistance Of Alfalfa

Calcium is not only one of the necessary nutrition element but also is second messenger which modulation the activeness of enzymes and functions of cells in plant with calcium-adjust material(CaM), calcium have important effect on the drought-resistance of plant. Alfalfa is a high quality of leguminous pasture, so enhance the drought-resistance of alfalfa has significance in practice.The objective of this study was to gain a better concentration of calcium which can enhance the power of alfalfa resist drought. Two different alfalfas were used to investigate the effects of calcium on the alfalfa drought resistance:AoHan and ZhaoDong. Some items were searched under the condition of 0 mmol/1,5 mmol/1, 10 mmol/1,20 mmol/1,30 mmol/1 of the concentration of calcium 12 hours respectively. These items are germination rate . radicle/plumule in PEG stress, conservation water capacity of leaf, relatively content water of leaf, relatively conductance rate . the content of chlorophyll, the content of proline. the vigor of root, the activity of peroxide enzyme, survival rate after repeatedly drought, the change of chloroplast after drought stress through transmission electron microscope(TEM). The results were as follows: the penetrability of membrane was fall, germination rate , radicle/plumule, relatively content water of leaf, relatively conductance rate ,the content of chlorophyll, the content of proline. the vigor of root, the activity of peroxide enzyme, survival rate after repeatedly drought pre-conditioning of alfalfa were enhance in concentration of 5-20 mmol/1 calcium compare with those without calcium. The results showed that the drought resistance of alfalfa was enhanced by calcium pre-conditioning of seed. Calcium pre-conditioning could also enhanced conservation water capacity of leaf and maintain physiological function, stabilize integrality of frame and membrane. Which provides scientific guidance for application calcium which has significance in theory and practice.Postgraduate: Jiang Yibao Supervisor: Cui Guowen Speciality: Grass Science...