01463naa a2200241 a 450000100080000000500110000800800410001910000160006024500480007626000090012430000130013349000280014652008150017465000130098965000150100265000150101765000170103265000090104965300150105865300150107365300120108877301210110014517302004-10-06       1976    bl uuuu     u00u1 u    #d1 aBRUN, W. A.  aTransmitting messages in the soybean plant.  c1976  ap.50-55.  a(ASTA. Publication, 6).  aI. Yield can be analyzed as the product of three physiological components: photosynthetic rate x photosynthetic duration x photosynthate partitioning. I am hypothesizing that at least two of these (rate and partitioning) is under endogenous hormonal control. II. The presence of developing pods stimulates leaf photosynthesis; this is associated with decreased levels of leaf starch and may be caused by an IAA signal from the pods. III. The precipitous drop in nodule N2 fixation during early pod fill may be caused by an ABA signal from the young seeds. Such young seeds produce very high levels of ABA which disapears when the nodule activity declines. Exogenous applications of ABA to intact root systems causes a severe inhibition of nodule N2 fixation long beforeit has an effect on photosynthate supply.  abreeding  aphysiology  aFisiologia  aMelhoramento  aSoja  aMorfologia  aMorphology  aSoybean  tIn: SOYBEAN SEED RESEARCH CONFERENCE, 6., 1976, Chicago. Report. Washington : American Seed Trade Association, 1976.