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Characterization and kinetics of soybean maturation and monocarpic senescence
Author(s) -
Okatan Yener,
Kahanak Gary M.,
Noodén Larry D.
Publication year - 1981
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.1399-3054.1981.tb08516.x
Subject(s) - radicle , abscission , hypocotyl , dry matter , biology , chlorophyll , botany , senescence , germination , nitrogen , starch , horticulture , chemistry , food science , organic chemistry , microbiology and biotechnology
Daring monocarpic senescence in potted soybeans ( Glycine maxi (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/cm2 of leaf surface decline little if at all before shedding. Preceding and 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.