Differential adaptation of high- and low-chill dormant peaches in winter through aquaporin gene expression and soluble sugar content |
| |
Authors: | Suravoot Yooyongwech Sumiko Sugaya Yoshihiko Sekozawa Hiroshi Gemma |
| |
Institution: | (1) Graduate School of Life and Environmental Sciences, University of Tsukuba, Ibaraki 305-8572, Japan;(2) Agricultural Science Section, Faculty of Science, Mahidol University, Kanchanaburi Campus, Saiyok, Kanchanaburi, 71150, Thailand; |
| |
Abstract: | Plants have their own mechanisms for overcoming various stresses. In cold regions, plants are subject to stress and must enter
an inherent dormancy, through several complex mechanisms, if they are to continue to exist. In winter, regulation of tonoplast
and plasma membrane aquaporin genes differed in the bud cushions of the high-chill peach (Prunus persica L. Batsch) cv. Kansuke Hakuto and the low-chill peach cv. Coral. In December and January, when the temperature was lowest
(around 2°C), the increased expression of Pp-γTIP1 and Pp-PIP1 seen in the bud cushions of Kansuke Hakuto may have been related to the concomitant high-soluble sugar content of the cushions
of this cultivar. This relationship may have made the cells highly stable and relatively unaffected by low-temperature stress
owing to the presence of “glasses” that prevented ice nucleation. However, a simpler form of cold protection regulation seemed
to occur in Coral, in which there was no winter increase in Pp-γTIP1 and Pp-PIP1 mRNA and a slow decline in total soluble sugar content in December and January. These results suggested that Pp-γTIP1 and Pp-PIP1, respectively, play important roles in intra- and intercellular membrane transport, enhancing cold resistance in the bud
cushions of high-chill cultivars. In addition, Pp-δTIP1 and Pp-PIP2 mRNA increased at the end of endodormancy in both cultivars. This change may be induced by endodormancy-release signals and
the resumption of bud activity in both cultivars. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|