[Natural inducing factors of peach bud dormancy and roles of Ca2+ in the dormancy induction].
Taking two-year-old peach tree of cv 'Chunjie' as test material, the natural inducing factors of peach bud dormancy and the roles of Ca2+ in the dormancy induction were studied. The results revealed that peach plant was very sensitive to short sunlight and/or natural low temperature. These two factors could induce growth cessation, dormancy, and freezing-resistance development, but their action mechanisms differed with each other. Short sunlight induced the dormancy first and the freezing-resistance then, whereas natural low temperature was in adverse. In case of the cofunction of short sunlight and low temperature, i.e., under the natural condition, short sunlight was the main factor inducing growth cessation, dormancy, and freezing-resistance development, while natural low temperature was the secondary one. The inducement effect of short sunlight was closely related to the actions of Ca2+, because Ca2+ played a messenger role in the signal transduction of short sunlight. In the experiment of supplemental light, it was found that with the decrease of temperature, the Ca2+ had an increasing influx from the vacuole, intercellular space, and cell wall to the cytosol and nuclei. At the same time, plant growth slowed down and finally ceased, dormancy started then, and freezing-resistance developed, which indicated that as a messenger in the signal transduction of natural low temperature, Ca2+ played an important role in the inducement of growth cessation, dormancy, and freezing-resistance development by natural low temperature.
Wang
Hai-bo
HB
Fruit Research Institute, Chinese Academy of Agricultural Sciences, Xingcheng 125100, Liaoning, China. haibo8316@163.com
Wang
Xiao-di
XD
Cheng
Cun-gang
CG
Wang
Bao-liang
BL
Li
Min
M
Gao
Dong-sheng
DS
Liu
Feng-zhi
FZ
D002118:Calcium / Q000378:metabolism*; D003080:Cold Temperature; D027861:Prunus / Q000254:growth & development* / Q000378:metabolism / Q000502:physiology; D036226:Seedlings / Q000254:growth & development / Q000378:metabolism / Q000502:physiology; D013472:Sunlight
D002118:Calcium