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Flower-Inducing Potency of Different Kinds of Leaves in Soybean, Glycine max (L.) Merr.

S. Shanmugasundaram and M. S. Lee
Botanical Gazette
Vol. 142, No. 1 (Mar., 1981), pp. 36-39
Stable URL: http://www.jstor.org/stable/2474784
Page Count: 4
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Flower-Inducing Potency of Different Kinds of Leaves in Soybean, Glycine max (L.) Merr.
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Abstract

The flower-inducing potencies of different kinds of leaves were studied in 10-h and 16-h photoperiods with two soybean cultivars (Glycine max [L] Merr.), photoperiod-sensitive accession G 2120 and day-neutral accession G 215. Regardless of photoperiod, the day-neutral cultivar produced flowers, pods, and seeds where cotyledon(s) alone, unifoliolate(s) alone, cotyledons and unifoliolates together, or trifoliolate(s) alone were exposed to photoperiodic treatment. Cotyledonary and unifoliolate leaves alone are evidently capable of producing sufficient flower-inducing stimulus and photosynthate to saturate the flowering response of the day-neutral plant. However, the number of pods and seeds produced was greatest in plants having all trifoliolate leaves. The photoperiod-sensitive cultivar did not produce flowers without trifoliolate leaves even under 10-h photoperiods. This cultivar thus has an obligate vegetative phase, i.e., the period from emergence until the first trifoliolate leaf is fully unfolded.

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