桃枝条梢端生长及其与温度、叶水势和比叶重关系的研究

Shoot tip growth of peach in relation to temperature ,leaf water potential and specific weight

以金冠、汉瑞、红港、卡尔红为试材，探讨了桃枝条梢端生长与环境温度、叶水势和比叶重之间的关系及其昼夜变化规律。表明：在试验条件下枝条梢端生长速率与环境温度呈显著正相关，与一天中早、晚碳水化合物积累也呈显著相关，而与叶片水势变化无关。梢端生长速率昼夜总的变化趋势与气温变化相吻合，最大值出现在平均气温最高的傍晚（１６：００～２０：００），最小值出现在平均温度最低的凌晨（０：００～８：００）。在２５±０．５℃恒温条件下，梢端生长速率最大值出现后，并不随即下降，而是保持这个生长速率直至午夜，尔后逐渐降至最低值。太阳升起后，生长速率又逐渐回升。

Studles with peach var.Goldcrest ,O' Hery ,Red Haven and Cal Red revealed thatshoot tip growth rate wassignificantly related to temperature and carbohydrate accumulation lev-el,but there was no relation to leaf water potential. The diurnal pattern of shoot tip growth ratetallied with changes of temperature,with maximum growth in the lateafternoon(16:00-20:00)and minimum growth from deep night to morning (0: 00-8: 00)When temperature kept at 25±0.5℃ constantly ,the reached maximum growth did not immediately decline ,but retained till mid- night.