Abstract
The primary actions of low-intensity light in triggering the photoperiodic and photomorphogenic reactions in plants are discussed. Topics discussed include the photopericdic control of flowering; low-intensity light reactions; the control of lettuce seed germination by light; the control of hypocotyl heok unberding with light; control of leaf expansion by light; control of anthocyanin synthesis by light; the control of oat coleoptile and mesocotyl growth by light; the action spectra for red and far red control of growth responses; the blue portion of the action spectra; reactions in the red and far red reaction system; and proposed areas of research. 59 references. (C.H.)
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