Root growth, cytokinin and shoot dormancy in lychee (Litchi chinensis Sonn.)

O'Hare, T. J. and Turnbull, C. G. N. (2004) Root growth, cytokinin and shoot dormancy in lychee (Litchi chinensis Sonn.). Scientia Horticulturae, 102 2: 257-266.


Author O'Hare, T. J.
Turnbull, C. G. N.
Title Root growth, cytokinin and shoot dormancy in lychee (Litchi chinensis Sonn.)
Journal name Scientia Horticulturae   Check publisher's open access policy
ISSN 0304-4238
Publication date 2004-11
Sub-type Article (original research)
DOI 10.1016/j.scienta.2004.02.004
Volume 102
Issue 2
Start page 257
End page 266
Total pages 10
Place of publication Amsterdam, Netherlands
Publisher Elsevier
Language eng
Formatted abstract Potted lychee trees (cv. Tai so) with mature vegetative flushes were grown under three day/night temperature regimes known to induce floral (18/13°C), intermediate (23/18°C) and vegetative (28/23°C) shoot structures. Heating roots respective to shoots accelerated bud-break and shoot emergence, but reduced the level of floral initiation in emergent shoots. At 18/13°C, root temperatures of 20 and 25°C decreased the period of shoot dormancy from 9 weeks to 5 and 3 weeks, respectively. A root temperature of 20°C also increased the proportion of both leafy and stunted panicles to normal leafless panicles, and reduced the number of axillary panicles accompanying each terminal panicle. A root temperature of 25°C produced only vegetative shoots. At 23/18°C, heating roots increased the proportion of vegetative shoots and partially emerged buds to leafy and stunted panicles 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 23/18°C. Bud-break did not occur until root cooling was terminated and root temperature returned to that of the shoot. At 23/18°C, subsequent emergent shoots had a greater proportion of leafy panicles relative to control trees. At 28/23°C, 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.
Keyword Litchi chinensis
Shoot development
Root Temperature
Floral Initiation
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: Queensland Alliance for Agriculture and Food Innovation
 
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