Effects Of S3307 And DTA-6 On Assimilate Accumulation And Metabolism Or Yield In Soybean Canopy

The research was conducted in test base of Heilongjiang Bayi Agricultural University during the three years of 2013~2015, using sub-indeterminate podding habits varieties Hefeng 50 and Kenfeng 16 for the trial. And we uesd two regulators, S3307 and DTA-6 at R1 stages by foliar application on the leaves. During seed filling to sample,soybean plants were classified as upper、middle and basal sections to study the effect of PGRs on plant morphological traits、assimilate accumulation、photosynthetic characteristic、assimilate physiological metabolism of source and sink. Aiming to provide scientific basis for PGRs on agricultural production through the source-sink theory. Major research results were follows:1. S3307 could shorten the internodes of basal nodes. DTA-6 also shortened the basal internodes and improved the upper internodes, and all increased the section density. The maximum time in leaves area of upper were advanced, which could be beneficial for soybean leaves to catch light.2. The two treatments increased the dry weight in plant、petiole、leaves、pod husk、grains of upper and middle. Form the perspective of the canopy dry matter distribution ratio, dry matter distribution ratio of the upper and middle were increased by PGRs, and dry matter distribution ratio of the basal was increased at the later stage.3. The chlorophyll content and the photosynthesis ratio in leaves of different canopy were improved by S3307 and DTA-6. The maximum time of photosynthesis ratio in Hefeng50 leaves of upper and middle were lated by S3307 and Kenfeng16 by DTA-6 to prolong the time of photosynthesis. The transpiration rate and stomatal conductance in leaves of different canopy were increased by S3307 and DTA-6 during the late of seed filling.4. The content of soluble sugar、sucrose and starch in leaves of different canopy by S3307 and DTA-6 were higher than CK, and the content of fructose were basal than CK. The canopy ratio of soluble sugar and fructose content was ananimous. The content of sucrose and starch in leaves of upper and middle canopy were higher than these in leaves of basal canopy. In the most time, S3307 and DTA-6 increased the invertase activity in Hefeng50 leaves of different canopy and decreased in Kenfeng16. S3307 and DTA-6 raised SS activity in leaves of different canopy and SPS activity in initial and middle stage.5. S3307 and DTA-6 increased the content of soluble sugar、sucrose and starch and fructose in grainss of different canopy. The soluble sugar and sucrose content in grainss of upper and middle were higher than the basal. The fructose content in grainss of basal canopy was higher than others, and for starch, the content in grainss of middle and basal were higher. S3307 and DTA-6 increased the invertase activity in Hefeng50 grainss of the upper and basal canopy and in Kenfeng16 grainss of the upper and middle canopy.6. The number and the weight of seeds in upper and middle section were increased by S3307, and these in upper section was increased by DTA-6. S3307 mainly increased the contribution ratio of upper and middle section, and DTA-6 mainly increased the contribution ratio of upper section to increase soybean yield. The two treatments significantly increased pods number per plant、seeds per plant、100-seed weight and soybean yield, and DTA-6 treatment was better.7. The two treatments significantly increased the protein content in grainss of upper and middle canopy and insignificantly decreased the oil content. DTA-6 treatment was better on improving protein content and decreasing oil content. Form the canopy structure to say, the turn of the protein content was the upper、the middle and the basal. The oil content of different canopy was the same.