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- W2131102825 abstract "Abstract There is usually a linear relationship between pod and seed number per unit area and assimilate supply in soybean (Glycine max L. Merrill) communities. In contrast, the relationship is curvilinear at single phloem-isolated nodes. To further investigate this curvilinear relationship, we evaluated photosynthesis, leaf starch levels and pod and seed number at phloem-isolated nodes of cultivar Elgin 87 in three greenhouse experiments. The main stem was girdled between the fifth and sixth nodes (unifioliolate node was node one) when the first flowers opened at the sixth node. The main stem above the sixth node was removed and defoliation (five or six levels from 0 to 100%) created a range in assimilate supply. Girdling increased leaf starch levels 3- to 7-fold over non-girdled plants within 7 days. In two experiments starch decreased to control levels within 14–27 days after girdling, but in a third experiment the increase was maintained for 28 days. Defoliation reduced leaf starch levels, with 66–91% defoliation lowering it to the level in the non-girdled controls. Pod and seed number were directly related to assimilate supplies at low levels of assimilate availability when there was no accumulation of starch. There were only relatively small increases in pod and seed number at high levels of assimilate availability, but there were large accumulations of starch in the leaves. Flower and pod abortion was always above 50%, so pod set was not limited by flower availability. The failure of pod and seed number to respond to high levels of assimilate availability suggests that there may be other processes involved in determining pod and seed number at isolated nodes in soybean." @default.
- W2131102825 created "2016-06-24" @default.
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- W2131102825 date "2000-10-01" @default.
- W2131102825 modified "2023-09-27" @default.
- W2131102825 title "Leaf starch accumulation and seed set at phloem-isolated nodes in soybean" @default.
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- W2131102825 doi "https://doi.org/10.1016/s0378-4290(00)00110-6" @default.
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