Impact of root and shoot temperature on bud dormancy and floral induction in lychee (Litchi chinensis Sonn.)

OHare, T. J. (2004) Impact of root and shoot temperature on bud dormancy and floral induction in lychee (Litchi chinensis Sonn.). Scientia Horticulturae, 99 1: 21-28. doi:10.1016/S0304-4238(03)00083-9


Author OHare, T. J.
Title Impact of root and shoot temperature on bud dormancy and floral induction in lychee (Litchi chinensis Sonn.)
Journal name Scientia Horticulturae   Check publisher's open access policy
ISSN 0304-4238
Publication date 2004-01-01
Sub-type Article (original research)
DOI 10.1016/S0304-4238(03)00083-9
Volume 99
Issue 1
Start page 21
End page 28
Total pages 8
Place of publication Amsterdam, Netherlands
Publisher Elsevier
Collection year 2004
Language eng
Subject C1
270402 Plant Physiology
780105 Biological sciences
0706 Horticultural Production
Abstract Potted lychee trees (cv. Tai so) with mature vegetative flushes were grown under three day/night temperature regimes known to induce floral (18/13degreesC), intermediate (23/18degreesC) and vegetative (28/23degreesC) shoot structures. Heating roots respective to shoots accelerated bud-break and shoot emergence, but reduced the level of floral initiation in emergent shoots. At 18/13degreesC, root temperatures of 20 and 25degreesC decreased the period of shoot dormancy from 9 weeks to 5 and 3 weeks, respectively. A root temperature of 20degreesC also increased the proportion of both leafy and stunted panicles to normal leafless panicles, and reduced the number of axillary panicles accompanying each terminal particle. A root temperature of 25degreesC produced only vegetative shoots. At 23/18degreesC, heating roots increased the proportion of vegetative shoots and partially emerged buds to leafy and stunted particles as well as accelerating bud-break. Cooling of roots in relation to the shoot resulted in non-emergence of buds at both 28/23 and 23/18degreesC. Bud-break did not occur until root cooling was terminated and root temperature returned to that of the shoot. At 23/18degreesC, subsequent emergent shoots had a greater proportion of leafy panicles relative to control trees. At 28/23degreesC, all emergent shoots remained vegetative. Lychee floral initiation is influenced by both root and shoot temperature. Root temperature has a direct effect on the length of the shoot dormancy period, with high temperatures reducing this period and the subsequent level of floral initiation. However, an extended period of dormancy in itself is not sufficient for floral initiation, with low shoot temperatures also a necessary prerequisite. (C) 2003 Elsevier B.V. All rights reserved.
Keyword Horticulture
Litchi Chinensis
Floral Initiation
Root Temperature
Shoot Development
Water-stress
Initiation
Citrus
Q-Index Code C1

Document type: Journal Article
Sub-type: Article (original research)
Collections: 2005 Higher Education Research Data Collection
School of Biological Sciences Publications
 
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Created: Wed, 15 Aug 2007, 13:10:01 EST