TY - JOUR
T1 - The expression of VvPHYA and VvPHYB transcripts is differently regulated by photoperiod in leaves and buds of grapevines
AU - Pérez, Francisco J.
AU - Kühn, Nathalie
AU - Ormeño-Nuñez, Juan
AU - Rubio, Sebastián
N1 - Funding Information:
signal for the entrance of VvPHYAand VvPLandes of buds into ED, since in Arabidopsis it hasHYBexpression by SD-photoperiod could be a been demonstrated that most light responsiveness genes are mediate by PHYA or PHYB.15 Hence in the absence of PHYs expression bud transcriptome could be highly modified and metabolism depressed, favoring thus a recess stage characteristic of bud-ED. Acknowledgements © Financial support of Fondecyt project 1080013 is gratefully 2a0ck0now9le dged.
PY - 2009/7
Y1 - 2009/7
N2 - Light signals perceived by phytochromes (Phys) and cryptochromes (Crys) play key roles in plant growth and development and in photoperiod dependant process such as flowering, tuberization, seasonal growth cessation and dormancy. The integration of the light signals with the endogenous circadian oscillator provides plants with a mechanism to monitor changes in photo-period or day-length. In a recent report, we established that in Vitis vinifera L. cv Thompson Seedless, photoperiod drives the entrance of buds into endodormancy (ED) and modifies the expression of VvPHYA and VvPHYB transcripts in grapevine leaves, suggesting that both VvPHYs could play crucial roles in SD-induced transition of bud into ED. Here, we aimed to establish whether the transition of grapevine buds into ED is a mere consequence of a decision taken in the leaf or whether the bud responds by itself to photoperiod. Results show that in defoliated grapevine canes, bud-ED development is delayed compared with non-defoliated control canes, and that under LD-photoperiod both VvPHYA and VvPHYB transcripts are highly expressed in grapevine buds, whilst under SD-photoperiod both VvPHYs are downregulated and expression can not be detected. Overall, the results suggest that grapevine bud behaves as semi-autonomous organ in sensing the photoperiod signal, and that VvPHYA and VvPHYB gene expression is differently regulated by photoperiod in leaf and bud of grapevines.
AB - Light signals perceived by phytochromes (Phys) and cryptochromes (Crys) play key roles in plant growth and development and in photoperiod dependant process such as flowering, tuberization, seasonal growth cessation and dormancy. The integration of the light signals with the endogenous circadian oscillator provides plants with a mechanism to monitor changes in photo-period or day-length. In a recent report, we established that in Vitis vinifera L. cv Thompson Seedless, photoperiod drives the entrance of buds into endodormancy (ED) and modifies the expression of VvPHYA and VvPHYB transcripts in grapevine leaves, suggesting that both VvPHYs could play crucial roles in SD-induced transition of bud into ED. Here, we aimed to establish whether the transition of grapevine buds into ED is a mere consequence of a decision taken in the leaf or whether the bud responds by itself to photoperiod. Results show that in defoliated grapevine canes, bud-ED development is delayed compared with non-defoliated control canes, and that under LD-photoperiod both VvPHYA and VvPHYB transcripts are highly expressed in grapevine buds, whilst under SD-photoperiod both VvPHYs are downregulated and expression can not be detected. Overall, the results suggest that grapevine bud behaves as semi-autonomous organ in sensing the photoperiod signal, and that VvPHYA and VvPHYB gene expression is differently regulated by photoperiod in leaf and bud of grapevines.
KW - Photoperiod
KW - Phytochromes
KW - Vitis vinifera
UR - http://www.scopus.com/inward/record.url?scp=67650873216&partnerID=8YFLogxK
U2 - 10.4161/psb.4.7.8907
DO - 10.4161/psb.4.7.8907
M3 - Article
AN - SCOPUS:67650873216
SN - 1559-2316
VL - 4
SP - 614
EP - 616
JO - Plant Signaling and Behavior
JF - Plant Signaling and Behavior
IS - 7
ER -