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果实不同发育阶段去果对桃源叶光合作用的影响
引用本文:李卫东,李绍华,吴本宏,杨建民,王红清.果实不同发育阶段去果对桃源叶光合作用的影响[J].中国农业科学,2005,38(3):565-570.
作者姓名:李卫东  李绍华  吴本宏  杨建民  王红清
作者单位:1. 中国科学院植物研究所,北京,100093;中国农业大学农学与生物技术学院,北京,100094
2. 中国科学院植物研究所,北京,100093
3. 河北农业大学园林与旅游学院,保定,071001
4. 中国农业大学农学与生物技术学院,北京,100094
基金项目:国家自然科学基金资助项目(30170654)
摘    要: 以大久保桃为试材,在果实发育的不同阶段通过去果处理降低库力,同时设留果对照,并通过环剥和保留相同数量叶片严格控制库源关系,进行了源叶净光合速率(Pn)、碳水化合物含量及其淀粉代谢相关酶活性变化及Pn与气孔导度(Gs)、叶表面温度(TLeaf)等相互关系的研究。结果表明,与留果对照相比,去果处理源叶Pn、 Gs和蒸腾速率(E)显著降低,但在中午前后一段时间内TLeaf显著升高;除在果实迅速生长期间的叶片中淀粉含量外,去果对源叶细胞间CO2浓度、可溶性糖含量、还原糖含量、腺苷二磷酸葡萄糖焦磷酸化酶和淀粉酶活性无影响;源叶Pn与Gs呈极显著抛物线正相关、与E呈极显著直线正相关。无论是留果对照还是去果处理,源叶Pn在一定的温度范围内较高,当TLeaf超过其适宜的临界温度 (38℃)后,Pn急剧降低,且在相同TLeaf的情况下,尤其是当TLeaf高于38℃时,去果处理源叶Pn均显著低于留果对照。因此,在果树库力降低时,气孔开张度减小、TLeaf升高,可能是其Pn调控的重要机制之一。

关 键 词:  库源关系  光合作用  气孔导度  叶表面
收稿时间:2004-5-20

Leaf Photosynthesis in Response to Fruit Thining at Different Phenological Stages of Fruit Development in Peach Trees
LI Wei-dong,LI Shao-hua,WU Ben-hong,YANG Jian-min,WANG Hong-qing.Leaf Photosynthesis in Response to Fruit Thining at Different Phenological Stages of Fruit Development in Peach Trees[J].Scientia Agricultura Sinica,2005,38(3):565-570.
Authors:LI Wei-dong  LI Shao-hua  WU Ben-hong  YANG Jian-min  WANG Hong-qing
Institution:LI Wei-dong1,2,LI Shao-hua1,WU Ben-hong1,YANG Jian-min3,WANG Hong-qing2
Abstract:Fruit thining (DF) and retaining fruit (CK) were carried out at different phenological stages of fruit development on one-year-old shoot of Okubo peach trees Prunus persica (L.) Batsch.] through 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 fruit thining and CK. The results showed that fruit thining significantly decreased net photosynthetic rate (Pn), stomatal conductance (Gs) and transpiration rate (E), but significantly increased leaf surface temperature (TLeaf) at midday as compared with CK. Internal CO2 concentration, soluble sugar content, reductive sugar content, starch content except that at the final fruit rapid growth stage, ADP-glucose pyrophosphorylase and amylase activity in source leaves were not significantly affected by fruit thining. There was a significant positive parabolic correlation between Pn and Gs, and a strong positive linear correlation between Pn and E. Moreover, Pn increased with the increase of TLeaf if TLeaf was lower than 38℃, then decreased sharply when TLeaf exceeded this critical temperature for both fruit thining and CK. Pn of fruit thining was lower than that of CK in the same TLeaf, especially if TLeaf was higher than 38℃. It is suggested that the decreased stomatal aperture and increased leaf temperature may be an important mechanism in regulating photosynthesis under a decreased strength of sink demand by fruit thining in fruit trees.
Keywords:Peach  Sink-source relationship  Photosynthesis  Stomatal conductance  Leaf surface temperature
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