Effects Of Different Kinds Of Silica Sol On Rice Growth In Seedling Stage And The Main Physiological Indexes Under Low Temperature Stress

Rice is one of the most important cereal crops in China and a silicon plant.Chilling injury is one of the main meteorological disasters in agricultural production in China,which has occurr,ed in the northeast region,and seriously affected the growth and development of rice.Studies have shown that silicon can improve the ability of rice to resist low temperature.In this paper,rice Dongnong 427 as test material,the seedling stage of its spraying on the leaf of different types of silicon preparation Si-50(for ammonia propyl triethoxy silane),Si-60(for 3-propyl glycidyl ether oxygen radicals silane)three oxygen radicals,Si-50-G(with ammonia propyl triethoxy silane as raw material,through sol-gel method,the preparation of nanometer silicon containing amino),Si-60-G(3-propyl glycidyl ether oxygen radicals three oxygen radicals silane as raw material,by the sol-gel method nanometer silicon containing epoxy groups),and set up the control group in CK(amount of distilled water).The contents of photosythetic pigments,malondialdehyde(MDA),proline and soluble sugar in rice leaves were measured at low temperature of 12?,the night temperature is 10? for 3 days,5days and 7 days,and the contents of catalase and Oxygenase activity.To study the effects of different silicon preparations on the growth and physiological indexes of rice,and to reveal the mechanism of silicon preparation to improve the ability of rice resistance to low temperature stress.This study provides a scientific basis for the rational use of silicon preparation to improve rice chilling resistance of rice in Heilongjiang Province,to ensure the high and stable yield and fertilizer development both has important theoretical and practical significance.(1)Under low temperature stress conditions,rice in seedling stage after spraying on the leaf of silicon preparation increased,its growth potential of the plant height and dry weight were increased.When low temperature days no more than 5 days,Si-60,Si-50-G,Si-60-G processing after seedling stage of rice plant height increases with the increase of low temperature days,respectively,compared with CK increased to 24.32%(p>0.05),22.78%(p>0.05),17.37%(p>0.05).But when the low level enhancement,rice plant height tends to grow.Si-60-G after processing the dry weight of seedling rice along with the increase of temperature increase decline,compared with CK increased by 37.34%(p<0.05).Si-50-G after processing of seedling dry weight of rice will increase,compared with CK increased by 12.09%(p<0.05).(2)Under low temperature stress conditions,the amount of photosynthetic pigment in rice was increased after the spraying of silicon on rice leaf.Si-50?Si-60?Si-50-G?Si-60-G after processing of rice leaf chlorophyll a content with the increase of low temperature days first drop after toughening change trend and the CK increase;Si-60?Si-50-G?Si-60-G after processing of rice leaf chlorophyll b content increased with the increase of the number of days in low temperature,and compared with CK,respectively,increased by 28.83%(p>0.05),69.31%(p>0.05),40.76%(p>0.05);Si processing,Si-50?Si-50-G of rice leaf carotenoid content also increases with the increase of low temperature days,and compared with CK,respectively,increased by 69.72%(p>0.05),76.74%(p>0.05).It is shown that the silicon preparation has positive effect on the content of photosynthetic pigment of rice.(3)Under low temperature stress conditions,the Si-50?Si-60?Si-50-G?Si-60-G after processing in the seedling stage of rice leaf malondialdehyde content were lower,fell 22.60%(p>0.05)compared with CK respectively,232.62%(p<0.05),206.90%(p<0.05),248.62%(p<0.05).Low temperature process,the control group CK proline content in leaves of rice increases with the increase of low temperature days,seedling stage after spraying on the leaf of silicon preparation in rice leaf proline content.Si-50?Si-60?Si-50-G?Si-60-G after processing in the seedling stage of rice leaf proline content and decreased with the increase of the number of days in low temperature,the Si-50 than CK was reduced by 15.57%(p<0.05).Early low temperature stress,the Si-50,the Si-50?Si-60?Si-50-G?Si-60-G processed rice soluble sugar content were reduced by 70.99%(p<0.05),70.99%(p>0.05),61.27%(p<0.05)and 16.48%(p<0.05).In this paper,the contents of propylene dialdehyde,proline and soluble sugar in rice leaves can be reduced to a certain extent after seedling of rice leaf.(4)Under low temperature stress conditions,the activity of the POD increases.In this test,the activity of the rice leaf POD after the Si-50?Si-50-G treatment decreased,respectively,by 137.84%(p<0.05)and 135.28%(p<0.05)respectively.Under the stress of mild hypothermia Si-50-G?Si-60-G processing after seedling of rice plant CAT activity increased with the increase of number of days in low temperature increase,increased by 275.31%(p<0.05),respectively,136.96%(p<0.05).But when the temperature was too low,the activity of CAT showed a partial decline.In this paper,the activity of the rice spray silicon on the seedling stage was adjusted for the activity of POD and CAT.