Mechanism Of Methanol To Improve Photosynthesis Efficiency In Upland Cotton

Upland cotton (Gossypium hirsutum L.) is a very important economic crop in China’s national economy. The photosynthetic rate that biological and economic yield of cotton from the cotton leaf photosynthesis to measure the magnitude of the photosynthetic capacity, usually unit leaf area. The magnitude of the photosynthetic rate and yield components have an extremely close relationship, so increase crop photosynthetic efficiency, its meaning is self it being understood. Recent studies shown that the methanol solution to promote the growth of C3plants sprayed with different concentrations of methanol in different crops, the yield was large increase. In this study, after spraying exogenous methanol aqueous solution to cotton in the reproductive growth stage of cotton crop, the detection analysis of the photosynthetic rate of leaves, glycolic acid oxidase, seed cotton yield as well as the content of glutathione, chlorophyll and soluble sugar. The results showed that:(1) after spraying methanol of aqueous, in bright sunlight and high temperature conditions, the activity of GLO dropped significantly and long-term in foliar. And this inhibitory action show that in the full-bud stage is greater than in the full-bloom stage and the boll stage, the aqueous methanol of30%is better than the20%and10%;(2) the same period, there is a negative relation between photosynthetic rate and activity of GLO. The unginned yield was increased compared with the control subjects. When the treated leaf glycolate oxidase by varying degrees of inhibition, photosynthetic rate is correspondingly increased; and yield of cotton crop harvest-seed cotton yield also increased;(3) different concentrations of aqueous methanol treatment, the glutathione content compared with the control were improved;(4) concentration of30%aqueous methanol treatment after the chlorophyll content increased significantly;(5) the soluble sugar content changes significantly in the full-bud stage changes. The results also indicated that the methanol may involve in that metabolism of photorespiration and the mechanism of enhanced photosynthetic efficiency by spraying aqueous methanol on cotton in bright sunlight and high temperature conditions.