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首页> 外文期刊>农业科学学报（英文版） >Leaf Photosynthesis in Response to Removing Fruit During Different Phenological Stages of Fruit Development in Peach Trees
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Leaf Photosynthesis in Response to Removing Fruit During Different Phenological Stages of Fruit Development in Peach Trees

机译：桃树果实发育的不同物候期叶片光合作用对去除果实的响应

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Removing fruit (RF) and retaining fruit (CK) were carried out during different phenological stages of fruit development on one-year-old shoot of Okubo peach trees [Prunus persica (L.) Batsch.] under preventing exportation of the assimilates to the non experimental parts of the tree by girdling one-year-old shoot and keeping the same leaves between RF and CK.The results showed that fruit removal significantly decreased net photosynthetic rate (Pn), stomatal conductance (Gs)and transpiration rate (E), but significantly increased leaf surface temperature (TLeaf) at about midday as compared with CK.Internal CO2 concentration, soluble sugar content, reductive sugar content, starch content except that during the final rapid fruit growth stage, ADP-glucose pyrophosphorylase and amylase activities in source leaves were not significantly affected by fruit removal. There was a significantly positive parabolic correlation between Pn and Gs, and a strong positive linear correlation between Pn and E. Moreover, Pn increased with increased TLeaf if Tieaf was below 38℃, then decreased sharply when TLeaf exceeded the above critical temperature for both RF and CK. Pn of RF was lower, however,than that of CK in the same TLea, especially if TLeaf exceeded 38℃. It is suggested that the decreased stomatal aperture and increased TLeaf may be the important mechanism in regulating photosynthesis under a decreased strength of sink demand by RF in fruit trees.
机译：在大果桃树的一岁幼枝上，在水果发育的不同物候阶段进行了摘果（RF）和保果（CK），以防止将同化物输出到果树上。在树的非实验部分上环抱一岁的芽，并在RF和CK之间保持相同的叶子。结果表明，去除果实可显着降低净光合速率（Pn），气孔导度（Gs）和蒸腾速率（E）但在中午时叶表面温度（TLeaf）显着高于CK。内部CO2浓度，可溶性糖含量，还原糖含量，淀粉含量，除了在果实快速生长的最后阶段外，ADP-葡萄糖焦磷酸化酶和淀粉酶的活性去除果实对源叶没有显着影响。 Pn和Gs之间存在明显的抛物线正相关，而Pn和E之间存在强的线性正相关。此外，如果Tieaf低于38℃，则Pn随着TLeaf的增加而增加，然后当TLeaf超过上述两个RF的临界温度时，Pn急剧下降。和CK。然而，在相同的TLea中，RF的Pn低于CK，尤其是当TLeaf超过38℃时。建议在果树上RF降低茎需求强度的条件下，减小气孔孔径和增加TLeaf可能是调节光合作用的重要机制。

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