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Grafting experiments on the nature of the decline in N 2 fixation during fruit development in soybean
Author(s) -
Malik Nasir S. A.
Publication year - 1983
Publication title -
physiologia plantarum
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.351
H-Index - 146
eISSN - 1399-3054
pISSN - 0031-9317
DOI - 10.1111/j.1399-3054.1983.tb02786.x
Subject(s) - rootstock , nitrogen fixation , biology , nitrogen , fixation (population genetics) , shoot , grafting , point of delivery , chromosomal translocation , botany , horticulture , chemistry , biochemistry , organic chemistry , gene , polymer
A decline in nitrogen fixation at the time of pod‐filling is persistently seen in soybeans. This phenomenon was studied by grafting experiments. Young scions with 3 nodes were grafted near the base of fruiting stocks which had passed their peak of nitrogen fixation. These grafts produced a second peak of nitrogen fixation on the same root system, indicating that the decline is reversible. If the scions were grafted near the apex of the fruiting stocks then the second peak of nitrogen fixation was very small. Thus, the translocation system could have an important role in regulating the decline in nitrogen fixation. Grafting of a second shoot of the same age as the rootstock, after the decline in nitrogen fixation, did not reduce the rate of decline even when the fruits from the scion were removed. It appears that physiological changes in different components of the shoot jointly regulate the decline in the rate of nitrogen fixation in soybeans.