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JXB Advance Access originally published online on June 24, 2009
Journal of Experimental Botany 2009 60(12):3521-3530; doi:10.1093/jxb/erp195
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© 2009 The Author(s).
This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/2.0/uk/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited. This paper is available online free of all access charges (see http://jxb.oxfordjournals.org/open_access.html for further details)

RESEARCH PAPER

Dormancy-associated MADS genes from the EVG locus of peach [Prunus persica (L.) Batsch] have distinct seasonal and photoperiodic expression patterns

Zhigang Li1, Gregory Lynn Reighard1, Albert Glenn Abbott2 and Douglas Gary Bielenberg1,3,*

1Department of Horticulture, 152 Poole Agricultural Center, Clemson University, Clemson, SC 29634-0319, USA
2Department of Genetics and Biochemistry, Clemson University, Clemson, SC 29634-0318, USA
3Department of Biological Sciences, Clemson University, Clemson, SC 29634-0314, USA

* To whom correspondence should be addressed: E-mail: dbielen{at}clemson.edu

Mapping and sequencing of the non-dormant evg mutant in peach [Prunus persica (L.) Batsch] identified six tandem-arrayed DAM (dormancy-associated MADS-box) genes as candidates for regulating growth cessation and terminal bud formation. To narrow the list of candidate genes, an attempt was made to associate bud phenology with the seasonal and environmental patterns of expression of the candidates in wild-type trees. The expression of the six peach DAM genes at the EVG locus of peach was characterized throughout an annual growing cycle in the field, and under controlled conditions in response to a long day–short day photoperiod transition. DAM1, 2, 4, 5, and 6 were responsive to a reduction in photoperiod in controlled conditions and the direction of response correlated with the seasonal timing of expression in field-grown trees. DAM3 did not respond to photoperiod and may be regulated by chilling temperatures. The DAM genes in peach appear to have at least four distinct patterns of expression. DAM1, 2, and 4 are temporally associated with seasonal elongation cessation and bud formation and are the most likely candidates for control of the evg phenotype.

Key words: Annual, bud, chilling, perennial, photoperiod

Received 18 March 2009; Revised 7 May 2009 Accepted 19 May 2009


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