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Physiological and molecular studies of staygreen caused by pod removal and seed injury in soybean

The Crop Journal 2016年第6期4卷 435-443页

作者： Xinxin Zhang Min Wang Tingting Wu Cunxiang Wu Bingjun Jiang Changhong Guo Tianfu Han Key Laboratory of Molecular Cytogenetics and Genetic Breeding of Heilongjiang College of Life Science and TechnologyHarbin Normal University MOA Key Laboratory of Soybean Biology (Beijing) Institute of Crop Sciencethe Chinese Academy of Agricultural Sciences

Leaves provide substances and signals for pod and seed development in ***,the regulatory feedbacks of pod and seed to leaf development remain *** investigated the effects of pod and seed on leaf senescence by conducting pod removal and seed injury *** removal and seed injury delayed leaf senescence and caused the staygreen phenotype of *** were dosage effects of pod number on the extent of staygreen in depodded *** concentrations of chlorophyll(SPAD value,an index of relative chlorophyll content),soluble protein,and soluble sugar in the leaves of depodded plants were higher than those of intact *** seed development,the content of IAA decreased,while that of ABA *** trend was more pronounced in intact than in depodded and seed-injured *** GA3/ABA ratio decreased gradually in all *** content of GA3 was relatively stable and was higher in intact than in depodded *** expression levels of four senescence-related genes,Gm SARK,Gm SGR1,Gm CYN1,and Gm NAC,declined in depodded or seed-injured treatments and were positively correlated with the number of leaves retained on *** FT2 a,the major flowering-promoting gene,was expressed at a higher level while E1,a key flowering inhibitory gene,was expressed at a lower level in depodded than in intact *** propose that the pod or seed can regulate leaf *** the seed is aborted owing to disease infection or pest attack,the leaves stay green because of the absence of the seed signals for senescence.

关键词： Soybean seed injury Staygreen Source–sink relationship

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Experimental study on the performance of bowl-tray rice precision seeder

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International Journal of Agricultural and Biological Engineering 2014年第1期7卷 17-25页

作者： Yi Shujuan Liu Yongfen Wang Chun Tao Guixiang Liu Haiyan Wang Ruihan Engineering College Heilongjiang Bayi Agricultural UniversityDaqing 163319Heilongjiang ProvinceChina

In order to optimize the parameters of bowl-tray rice precision seeder and improve its performance,three major factors respectively at five levels,including shaped hole diameter,vertical displacement of rice seeds and rotating speed of cam,were tested,the quadratic orthogonal rotational regression experiments were conducted,and the effects on seeding rate,leakage sowing rate and the injury rate were *** test results show that factors affecting rice seeding rate are in the order of shaped hole diameter,rotating speed of cam and vertical displacement of rice *** factors affecting rice planting leakage rate are in the order of shaped hole diameter,vertical displacement of rice seeds and rotating speed of cam,and the factors affecting rice injury rate are in the order of rotating speed of cam,vertical displacement of rice seeds and shaped hole *** parameters(shaped hole diameter:10 mm,vertical displacement of rice seeds:27 mm,rotating speed of cam:13 r/min)and performance index(seeding rate:95.43%,leakage sowing rate:0.37%,injury rate:0.58%)provided the basis for design and performance improvement of the bowl-tray rice precision seeder.

关键词： bowl-tray rice precision seeder rice seed sowing performance seed injury shaped hole quadratic orthogonal rotary regression experiment optimal design

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