Photosynthates Distribution And Translocation In The Middle And Later Growth Periods Of The Maize(Zea Mays L.) Of Yunnan Cultivated In The Lower Yangtze River Region

Food-fodder maize is an intermediate type between common maize and specific fodder corn,It can treat the grain,stem and leaf as raw material simultaneously,it also has the characteristics of grain and straw in common use,Not only the grain yield is high,but also can keep green when mature,It is good for silage and has rich nutrition,It also has high economic and biological yield.In today's vigorously develop animal husbandry,advocate"the straw animal husbandry"situation,Maize is the solution of China's food supply and demand,and it is also the better way to achieve the effectiveness of the supply of grain feed.Not only can guarantee the grain yield,but the occupation of cultivated land area at the same time,ensuring feed the supply of resources,so as to realize the close contact of farming and animal husbandry.It can improve the conversion rate to the supply of straw forage yields,avoiding wasting a lot of straw resources at the same time and achieve the purpose of environmental improvement.Photosynthesis is the basis of development and growth of maize production.At late growth stage of plant,photosynthesis capacity will have a direct impact on the yield of maize.Therefore study the accumulation and distribution of leaf photosynthetic product in the late growth of maize stem,is of great significance to the distribution regularity of Maize Photosynthetic products,and finally to improve the yield of maize.This study focuses on stems and leaves photosynthetic products accumulation and transportion of three different maize in the late growing.Not only from the space to explore the distribution of photosynthetic products,but also from the time to study the dynamics of its transport processes.In order to guide the type of corn grain and forage yield cultivation and efficient use provide the theoretical basis.In order to study the accumulation and distribution rule of grain and forage maize in the late growth,3 different varieties of maize are used in the experiments,from heading stage to mature stage,the dynamic changes of the whole plant dry matter content as well as the the center of the knot,and the lower three layers of different parts of the dynamic changes of dry matter content are studied.At the same time explore the whole plant dry matter content within a week after the removal of the dynamic changes in the ear ripe stage,and the the center of the knot,the lower three layers of different parts of the dynamic changes of dry matter content.The results show that,along with the late growth of maize ear development,the whole plant dry matter content increased significantly.The ear festival as the center,the dry matter content of the middle part of the most obvious increase and the maximum of the whole plant dry matter contribution.The upper and lower total dry matter increased during the grain filling stage,decreased gradually after filling stage,but little change in the overall.Ripe stage was removed within a week,the whole plant dry matter accumulation will continue.To the ear as the center section,the upper and middle dry matter increased significantly,lower dry matter content remained unchanged.The experiment study the dynamic changes of the soluble sugar percentage content of the whole plant,which regard the ear section as the center,divide it into to upper,centre and lower,which from heading stage to full ripening stage.At the same time explore the dynamic changes of the soluble sugar percentage content of the whole plant,which regard the ear section as the center,divide it into to upper,and which is within a week after remove ear section in full ripening stage.The results show that with the ear of corn grown in the late development,the percentage content of soluble sugar plants significantly reduced.To the ear as the center section,on one hand,the upper and middle parts of the soluble sugars shift to lower stems,on the other hand,Metastasis to the ear,providing a substrate for the accumulation of starch.during corn full ripeness period,within one week after the removal of ear,as the center section,the layers of soluble sugar percentages were significantly increased.The soluble sugar produced by photosynthesis in the leaves of the upper and middle shifted to the lower stems.