| Rice plays an important role in China’s grain industry,and the low temperature and cold damage in northeast China has occurred,which seriously affects the normal growth and development of rice.Rice is a sisi crop,and it has been found that silicon can effectively improve the resistance of rice to low temperature.In this paper,rice dongnong 427 was used as the test material,and in the tillering stage and during the stage of stage,the leaves were sprayed with Si-50(Aminopropyl triethoxysilane)、Si-60(3-glycidyl ether oxypropyl trimethoxysilane)、Si-50-G(The amino-containing nano-silicon was prepared by sol-gel method)、 Si-60-G(Epoxy-based nano-silicon was prepared by sol-gel method using 3-diglycidyl ether propyl trimethoxy silane)、Si-RH(Rice husk extraction of silicon)five foreign sources of silicon,and the control was set.After spraying the silicon at the tillering stage of rice,the treatment was done after 4 days of low temperature.Determination of tillering and booting stage of rice leaf photosynthetic pigment,mda,proline and soluble sugar content and activity of catalase,peroxidase(pod),and production and form factor,study the effect of exogenous silicon main physiological indicators of rice under low temperature stress and its effect on improve the resistance of rice.This research for the rational use of exogenous silicon ability,improve the rice resistance to low temperature stress and exogenous silicon impact on rice growth and development at different periods provided the scientific basis,to ensure the sustainable high yield and stable yield of rice in heilongjiang province as well as the silicon fertilizer research and development and so on all has the important theoretical and practical significance.The test results are as follows:(1)Spraying different exogenous silicon can improve the resistance of rice to low temperature and chilling damage and yieldUnder low temperature stress,the most significant increase in photosynthetic pigment content in rice leaves was Si-60-G,and the contents of chlorophyll a,chlorophyll b and carotenoids increased by 33.71%,17.84% and 55.91%,respectively.Si-50-G significantly reduced the content of malondialdehyde by 33.22%.Si-50-G significantly increased CAT activity in rice leaves by 22.04%.Si-50 significantly increased proline content by 169.12% and decreased POD activity by 48.80%.The soluble sugar content of si-60-g increased by 131.18% compared with that of the control group,which significantly increased the yield of rice by 27.50%.(2)Different exogenous silicon can be used to increase rice yield and regulate the physiological mechanism of rice leaves under normal temperature conditionsSi-60-G in tillering stage significantly increased rice yield by 30.42%.Si-RH can significantly improve the content of chlorophyll a in rice leaves by 14.49%,and the CAT activity of rice leaves increased by 49.13%.Si-60 significantly increased the soluble sugar content by 32.58%.Si-60 significantly increased the content of carotenoids in rice leaves by 19.8%,and the activity of POD decreased by 38.07%.Si-50 significantly increased the proline content of rice leaves by 80.06%,and Si-RH significantly reduced the content of malondialdehyde in rice leaves by 50.75%.To sum up,the application of exogenous silicon can effectively improve the resistance to low temperature of rice.Different kinds of exogenous silicon have different effects on the physiological indexes of rice,among which,Si-60-G has the best effect.Under the condition of normal temperature spraying exogenous silicon can increase rice yield,reasonable adjust various physiological processes in the body,is advantageous to the rice growth and development,the Si-60-G has the most significant effects on rice physiological indexes are. |
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