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Flowering of Stylosanthes guianensis in relation to juvenility and the long-short day requirement

Ison, R. L. and Humphreys, L. R. (1984). Flowering of Stylosanthes guianensis in relation to juvenility and the long-short day requirement. Journal of Experimental Botany, 35(1) pp. 121–126.

DOI (Digital Object Identifier) Link: https://doi.org/10.1093/jxb/35.1.121
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Abstract

Seedlings of Stylosanthes guianensis var. guianensis were grown in long (14 h) days in five temperature regimes for varying periods before transfer to short (11 h) days at 30 °C/21 °C. The juvenile phase before seedlings responded to inductive conditions was c. 45-50 d, 50-60 d and 60-70 d for cv. Schofield, cv. Cook and C.P.I. 34906 respectively, which is positively related to their critical photoperiod for flowering. Temperatures favourable for growth (e.g. 30 °C/26 °C) reduced the juvenile phase in C.P.I. 34906 and in Cook, which did not flower in 11 h days unless previously exposed to more than 18 long days. In a second experiment cv. Cook was confirmed as a long-short day plant. Seedlings were grown for 50 d in a glasshouse with natural daylength extended to 13, 14, 16 or 24 h before transfer to 12 h photoperiods. Cook floral development was positively related to daylength provenance before transfer and plants in continuous 12 h did not flower. Shortening daylength after 48 cycles of 12 h to 11-75 h did not result in continued floral development in Cook plants but cv. Graham plants were initiated or transitional by 75 d.

Item Type: Journal Item
Copyright Holders: Not known
ISSN: 1460-2431
Keywords: Stylosanthes guianensis; photoperiod; temperature; flowering
Academic Unit/School: Faculty of Science, Technology, Engineering and Mathematics (STEM) > Engineering and Innovation
Faculty of Science, Technology, Engineering and Mathematics (STEM)
Item ID: 40196
Depositing User: Raymond Ison
Date Deposited: 21 May 2014 14:37
Last Modified: 07 Dec 2018 10:23
URI: http://oro.open.ac.uk/id/eprint/40196
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