桃芽自然休眠与两条主要电子传递途径变化的关系

花芽和叶芽总呼吸速率最低点均与自然休眠进程有关，第一个与自然休眠的起始时间相对应，最后一个则与自然休眠解除期相对应；细胞色素途径抑制剂氰化钾（KCN）对休眠芽的呼吸起部分抑制作用；抗氰呼吸抑制剂水杨基氧肟酸（salicylhydroxamic acid，SHAM）对总呼吸速率的效应随休眠进程而变化，休眠前期起促进作用，随休眠进程其促进作用逐渐减弱，从可调控休眠期（对外源措施敏感期）起转入抑制效应；KCN＋SHAM混合剂对总呼吸速率的效应与SHAM单独使用的效果相似，但其时总呼吸速率促进作用的起始点和结束点均较SHAM单独使用旱7d左右。

The Relation between En-Dormancy and Changes in Two Main Electron Transport Pathways of Nectarine (Prunus persica var. nectariana) Buds

Respiration rate of buds of Prunus persica var. nectariana Maxim. cv. Shuguang and Mayfire was studied during dormancy. The results showed that the bud respiration rate changed with the stage of dormancy for both cultivars. Respiration rate of buds of the controls decreased steadily before dormancy, while increased slowly from November 5th for Shuguang and October 29th for Mayfire, and then decreased sharply on December 17th at which dormancy was terminated. Cyanide (KCN) only partially inhibited respiration rate of dormant buds of nectarine during the whole period, and the trend of the buds respiration rate followed the same pattern as the control samples during the entire period. Cyanide inhibited the respiration rate of dormant nectarine buds to roughly the same degree. The effect of salicylhydroxamic acid (SHAM) on bud respiration rate varied with time. SHAM decreased bud respiration rate before dormancy and after the release of dormancy, but increased bud respiration rate during dormancy. SHAM increased bud respiration rate more than three times at the beginning of dormancy for all buds and the degree decreased gradually along with the dormant period until turn to decrease the respiration rate again at the end of dormancy. KCN plus SHAM had the same effect on bud respiration rate as SHAM acting alone. The time KCN plus SHAM began to increase bud respiration rate or terminated was about 7 d earlier than SHAM did, which was closely associated with the different stage of dormancy.