| Promotion of drought tolerance in corn seedling by Paclobutrazol |
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| DOI：10.7606/j.issn.1000-7601.2009.02.28 |
| Key Words: pp333 corn drought resistance physiological mechanism |
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| Abstract: |
| An experiment was conducted to study the effect of pp333 on promotiing drought tolerance of corn seedlings.The results showed that under the water stress the change of the membrane permeability of leaf and root was decreased under sprinkling PP333 treatment, and the osmotic substances was increased when pp333 sprayed on the leaf beforehand, and the transpiration rate was decreased under the sprinkling pp333 treatment, and the chlorophyll content and the photosynthesis rate was higher than those without sprinkling pp333 treatment, and the stomata conductance was fall under treatment of spraying pp333;under the water stress the nitrate reductase activity had a higher level when the pp333 sprayed beforehand.Moreover, under the water stress, the width of leaf, the diameter of shoot and the ratio of root/shoot were all increased, the single biomass of corn seedlings was the same as the control under the treatment of spraying pp333 beforehand.The conclusion was drawn that pp333 could enhance drought tolerance of corn seedlings, and the 0.3% was the optimal concentration for corn seedlings under this experimental condition. |
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