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Internode and petiole elongation of soybean in response to photoperiod and end-of-day light qualityElongation of main stem internodes and petioles of soybeans, Glycine max 'Ransom,' was examined in response to various photoperiod/temperature combinations and to end-of-day (EOD) light quality. Photoperiod treatments consisted of 10, 14, and 16 h in combination with day/night temperatures of 18/14, 22/18, 26/22, 30/26, and 34/30 C. The EOD treatments consisted of exposing plants to illumination from either incandescent (high far-red component, FR) or fluorescent (high red component, R) lamps during the final 0.5 h of a 10-h photoperiod. Internode elongation was not significantly promoted by the photoperiod treatments, and, in fact, under the two highest temperature regimes, internode elongation was suppressed under the longer photoperiods. Petiole elongation, however, was enhanced under the longer photoperiods at all temperatures. In the EOD light study, internode and petiole elongation was significantly greater on plants exposed to 0.5 h EOD from incandescent lamps than from fluorescent. Under the incandescent EOD treatment, plants increased dry matter production by 41% and exhibited greater partitioning of assimilates in stem and root portions than under fluorescent EOD.
Document ID
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Thomas, J. F.
(North Carolina State University Raleigh 27695, United States)
Raper, C. D. Jr
Raper CD, J. r.
Date Acquired
August 22, 2013
Publication Date
January 1, 1985
Publication Information
Publication: Botanical gazette (Chicago, Ill.)
Volume: 146
Issue: 4
ISSN: 0006-8071
Subject Category
Life Sciences (General)
Funding Number(s)
Distribution Limits
NASA Discipline Number 61-10
NASA Discipline Life Support Systems
Non-NASA Center

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