Characterization and kinetics of soybean maturation and monocarpic senescence [potted soybeans, Glycine max, foliar senescence, foliar chlorophyll, foliar soluble protein, foliar nitrogen, foliar starch, foliar abscission, seed and carpel growth, seed and carpel yellowing, germinability]
1981
Okatan, Y. | Kahanak, G.M. | Nooden, L.D. (Michigan Univ. (USA). Botany Dept.)
During monocarpic senescence in potted soybeans (Glycine max (L.) Merrill cv. Anoka) grown in controlled-environment chambers, foliar chlorophyll, soluble protein nitrogen, total nitrogen, and starch decline (roughly in that order). All of these precede visible yellowing and, of course, abscission. The pattern of yellowing within a leaf is not uniform and is closely paralleled by starch loss. Unexpectedly, acid-soluble nitrogen rises slightly before the total foliar nitrogen declines. Foliar fresh weight and total dry matter/cm('2) of leaf surface decline little if at all before shedding. Preceding amd even during the foliar yellowing, the seeds rapidly accumulate dry matter and nitrogen. Yellowing appears first in the radicle tip, then in the rest of the axis and the leaves and finally in the carpels. Ability to germinate is acquired at about the time the radicle + hypocotyl turns yellow. The relationship between these changes and their role in senescence is discussed.
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