Effect Of Accumulation And Distribution Of Soybean Metabolites On Stem Lodging Morphogenesis Of Shade Tolerant

The soybean lodging is an important constraint in intercropping. the lodging degree and shade environment are closely related to soybean stem strength. However, in maize-soybean intercropping the metabolite accumulation and its distribution is not clear in differ ent shade tolerant soybeans. Two different shade tolerant soybean varieties were select. These varieties were intercropped and monoculture. Analysis of soybean varieties resistance to shade showed that metabolism accumulation and its distribution are very imp ortant for shade resistance. The main results of our research are as follows:1. The studies on soybean stalk cellulose metabolism have shown that the SPS, SS, AL activity and NI activity decreased significantly in 37d but elevated significantly after 37d in intercropping as compared to monocropping. The correlation analysis showed that the soybean stalk cellulose content was negatively correlated with lodging rate and the snapping resistance was positively correlated with sucrose content, SPS and SS activities. The shade tolerant soybean stalk contains the high SPS, SS activities because of higher sugar content, which improve the stem strength and enhance its lodging resistance.2. Studies on the characteristics of dry matter accumulation and distribution showed that reducing the transmittance of soybean canopy shade can affect the photosynthesis. The strong shade tolerant soybean can show better photosynthesis in moderate shade environment. By comparing with monocropping, intercropped soybean seedlings weight accumulation in different stages was reduced significantly Comparing with control (no shading), shading significantly reduce the amount of dry matter accumulation. Correlation analysis showed that soybean light transmittance, photosynthesis and dry weight were positively correlated, while the lodging rate, transmission rate of soybean, root/shoot ratio, flexural strength, lodging resistance index were significantly negative correlated. Note, shading stress reduces the lodging resistance, changes the dry matter accumulation and distribution of soybean but soybean potential is optimum under moderate shade.3. To plant morphogenesis studies show, shade stress reduces soybean leaf photosynthetic capacity, change the material distribution, reducing the dry matter transfer amount to the stem of the big Beanstalk stalk fine and long, increases the risk of lodging, but strong resistant soybean varieties the shade in the cropping pattern and moderate shade treatment showed higher dry matter accumulation, strong stem mechanical characters, better morphological plasticity. Indicating light through the material of the plant.Accumulation and distribution, so as to adjust the plant morphological built, and better morphological plasticity is formed higher lodging resistance capability based.4. Comparing with the monoculture, the intercropped soybean stems and leaves showed the reduced degree of carbon, nitrogen and macromolecules metabolism. The strong shade resistant varieties of soybean showed lower reduced degree of carbon, nitrogen and macromolecule metabolism. In heavy shading condition no different was present among all soybean varieties. This shows that high degree of shade affects the photosynthesis in the form of light transpiration regulation, carbohydrates, fat and starch formation.5. Under moderate shading conditions the soybean can survive and tolerate the shade, while weak shade resistance varieties are very sensitive to shade. Severe shading suppresses the carbon, nitrogen and metabolism of macromolecule in soybean stems and leaves. From the perspective of metabolic group of soybeans leaves and stems shading stress metabolism of different varieties were analyzed. The results showed that in different planting model, the existence stems mainly contain six kinds (acetamide, glucose, xylulose, adipic acid, inositol, palmitic acid, benzoic acid) of metabolites for shading stress reaction. The 10 kinds of leaves metabolites (acetamide, xylulose, melibiose, adipic acid, inositol, ribitol, glycerol, butylene acid, propionic acid, propionic acid) involved in stress response shade. In a different shade processing, palmitic acid, fumaric acid, benzoic acid and salicylic acid involved in the soybean seedling shading shock reaction and valine, pine disaccharide, glucose, proline, malic acid, adipic acid,6-ribose, butyric acid, propionic acid and propionic acid and other metabolites mainly by adjusting the cell osmotic potential to Stress adaptation shade.