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以人工气候室模拟台风中大气水蒸气压亏(VPD)骤降,发现朱砂桔叶水势上升幅度大于果水势,叶果间水势差增大,致使水分向果分配,但效应短暂,而复水增加土壤水分对果膨大生长的影响更为明显和持久。控水期间果内渗透调节启动,同时叶从果中抽取更多水分也使果水势下降,复水后胁迫果的水势明显低于叶水势,使膨大生长更明显。“台风”引发的膨大生长包含被动和主动两种吸水机理,而以前者为主。模拟台风与自然台风不同,未能引起乙烯发生量加大,但引起酸性转化酶和三磷酸腺苷酶(ATPase)活性上升,有助于同化产物积累和渗透吸水及需能代谢增强。
The atmospheric pressure drop (VPD) of atmospheric water vapor in a typhoon was modeled by an artificial climate chamber. It was found that the water potential of JJ sand was larger than that of fruit water, and the water potential difference between fruit and leaves increased. As a result, the water was distributed to the fruit, but the effect was transient. Increasing soil moisture on the growth of fruit is more obvious and lasting effect. During the water control period, osmotic adjustment was started in the fruit, and at the same time, more water was extracted from the leaves and the water potential of the fruit decreased. After rewatering, the water potential of the stress fruit was significantly lower than that of the leaf water, making the growth more obvious. “Typhoon” caused by the expansion of growth, including passive and active two kinds of water absorption mechanism, while the former dominated. Different from natural typhoon, the simulated typhoon did not cause an increase in the amount of ethylene, but caused an increase in the activity of acid invertase and ATPase, helping to accumulate and permeate the assimilation product and enhance the metabolism.