Photomodulation of stem extension in light-grown plants: evidence for two reactions

Buck, Michael and Vince-Prue, D. 1985. Photomodulation of stem extension in light-grown plants: evidence for two reactions. Plant and Cell Physiology 26 (7) , pp. 1251-1261.

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Abstract

Internode elongation was measured in plants of Phaseolus vulgaris and Glycine max grown under 8 h photoperiods at 25 W m−2 in white fluorescent light, followed by light-extensions varying in quality, irradiance and duration. Two distinct responses to light were observed under these conditions. A reduction in PFR/P increased elongation, but elongation was also modified by a second reaction in which internode length increased with increase in the duration and irradiance of the day-extension. This light-promoted response occurred in both red and blue light. In the PFR-inhibition response, light acted directly on the expanding internode. The light-promoted response, in contrast, required irradiation of the leaf. The response to a short end-of-day exposure to far-red light progressively diminished as successive internodes expanded under the treatment, whereas the light-promoted response increased. The two processes appeared to interact and, in the later-expanding internodes, the effect of a reduction in PFR was greater under long day-extensions with mixed red and far-red light than in the end-of-day treatments.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Medicine
Subjects:	Q Science > QH Natural history > QH301 Biology
Uncontrolled Keywords:	Glycine max; Internode elongation; Phaseolus vulgaris; Photosynthesis; Phytochrome
Publisher:	Oxford University Press
ISSN:	0032-0781
Last Modified:	11 Sep 2023 06:24
URI:	https://orca.cardiff.ac.uk/id/eprint/53600

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