Correlation of cytokinins and abscisic acid with monocarpic senescence in soybeans |
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Authors: | Lindoo Susan J; Nood?n Larry D |
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Institution: | Department of Botany, University of Michigan Ann Arbor, Michigan 48109, U. S. A. |
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Abstract: | The involvement of cytokinins and abscisic acid (ABA) in themonocarpic senescence (foliar yellowing following fruit development)of soybeans was examined. Foliar sprays of cytokinin (104M zeatin or 105 M benzyladenine), begun when the plantsfirst set fruit and repeated every other day, significantlydelayed, but did not prevent, monocarpic senescence. Foliarsprays of 104 M ABA, applied in the same manner, significantlyhastened senescence of fruiting soybeans but apparently hadno effect on depodded plants. Leaf and stem material from pre-senescentand senescent plants was extracted, chromatographed, and bioassayedfor cytokinin-lilce activity (Amaranthus betacyanin productionassay) and ABA-like activity (oat coleoptile straight growthassay for inhibitors). ABA-like activity increased, and cytokinin-likeactivity decreased in shoot tissue before the plants began tosenesce. Cytokinin-like activity in the fruit also declinedduring this period. These results implicate a decrease in cytokininsand an increase in ABA-like inhibitors in the control of monocarpicsenescence of soybeans, but neither alone is causal.
1 Supported in part by Research Grant 416-15-79 from the USDACooperative State Research Service under PL 89106.
2 Present address: Biology Dept., College of St. Benedict'sSt. Joseph, Minn. 56374, U.S.A. (Received February 4, 1978; ) |
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