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Carbon‐14 Assimilate Translocation in Nodulated and Nonnodulated Soybeans 1
Author(s) -
Russell W. J.,
Johnson D. R.
Publication year - 1975
Publication title -
crop science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.76
H-Index - 147
eISSN - 1435-0653
pISSN - 0011-183X
DOI - 10.2135/cropsci1975.0011183x001500020004x
Subject(s) - biology , chromosomal translocation , nitrogen fixation , dry weight , botany , horticulture , nitrate , agronomy , gene , bacteria , ecology , biochemistry , genetics
Nodulating and nonnodulating soybean [ Glyclne max (L.) Merr.] isolines were grown for 30 days in silica sand in the greenhouse with 0, 50, and 100 μg N/g sand to evaluate 14 C translocation in plants dependent solely on N fixation or nitrate uptake or both. No differences were observed between the two geno. type's translocation patterns at the vegetative stage, when they are totally dependent on soil nitrate up to 120 hours after 14 CO 2 exposure. Plant leaves, totally dependent on symbiotically fixed N, exported 14% more 14 C to the roots and nodules when compared to plants with total inhibition of nodulation. No more than 2% of the total recovered 14 C was found in the nodule component at any harvest time. Plants with partial inhibition of nodulation (grown with 50 μg N/g sand) exhibited relatively intermediate characteristics. The stem component contained significantly less 14 C than the other treatments and was accompanied by a decrease in stem dry weight.