The pathogen, symptoms and occurrence regularity of peach shrinkage leaf curl were expounded, and the control measures for peach leaf curl were put forward by combining with the practical production, with the aim to p...The pathogen, symptoms and occurrence regularity of peach shrinkage leaf curl were expounded, and the control measures for peach leaf curl were put forward by combining with the practical production, with the aim to provide important references for the control and prevention of peach leaf curl.展开更多
Removing fruit (RF) and retaining fruit (CK) were carried out during different phenological stages of fruit development onone-year-old shoot of Okubo peach trees [Prunus persica (L.) Batsch.] under preventing exportat...Removing fruit (RF) and retaining fruit (CK) were carried out during different phenological stages of fruit development onone-year-old shoot of Okubo peach trees [Prunus persica (L.) Batsch.] under preventing exportation of the assimilates tothe 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 finalrapid fruit growth stage, ADP-glucose pyrophosphorylase and amylase activities in source leaves were not significantlyaffected by fruit removal. There was a significantly positive parabolic correlation between Pn and Gs, and a strongpositive linear correlation between Pn and E. Moreover, Pn increased with increased TLeaf if TLeaf was below 38°C, thendecreased 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 TLeaf , especially if TLeaf exceeded 38°C. It is suggested that the decreased stomatal aperture andincreased TLeaf may be the important mechanism in regulating photosynthesis under a decreased strength of sink demandby RF in fruit trees.展开更多
为探明窄叶桃叶片秋季的光合作用规律,以油蟠桃品种金霞油蟠和水蜜桃品种湖景蜜露为对照,在果实采收后(8月下旬和9月下旬)研究了窄叶桃品系BYDOP7029叶片的光合特性。结果表明,BYDOP7029的水分利用效率(WUE)日均值相对较高,表观CO2利用...为探明窄叶桃叶片秋季的光合作用规律,以油蟠桃品种金霞油蟠和水蜜桃品种湖景蜜露为对照,在果实采收后(8月下旬和9月下旬)研究了窄叶桃品系BYDOP7029叶片的光合特性。结果表明,BYDOP7029的水分利用效率(WUE)日均值相对较高,表观CO2利用效率(CUE)日均值显著高于金霞油蟠、湖景蜜露(P<0.05),蒸腾速率日积分值(DIV of Tr)较金霞油蟠低而表观光能利用效率(LUE)较湖景蜜露高(P<0.05),净光合速率日积分值(DIV of Pn)介于金霞油蟠和湖景蜜露且与2者具有显著性差异(P<0.05),光补偿点(LCP)较低而光饱和点(LSP)较高,表明BY-DOP7029具有较高的水分利用效能和光合效能,生态适应范围较宽。BYDOP7029的净光合速率(Pn)日变化在8月下旬和9月下旬分别表现"双峰型"和"单峰型",但午间Pn降低的原因均为非气孔限制。BYDOP7029的Pn与环境因子日变化的灰色关联分析表明,8月下旬和9月下旬影响其Pn的主要环境因子分别为大气CO2浓度(Ca)和光量子通量密度(PFD)。展开更多
文摘The pathogen, symptoms and occurrence regularity of peach shrinkage leaf curl were expounded, and the control measures for peach leaf curl were put forward by combining with the practical production, with the aim to provide important references for the control and prevention of peach leaf curl.
基金This study was supported by the National Natural Science Foundation of China(30170654).
文摘Removing fruit (RF) and retaining fruit (CK) were carried out during different phenological stages of fruit development onone-year-old shoot of Okubo peach trees [Prunus persica (L.) Batsch.] under preventing exportation of the assimilates tothe 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 finalrapid fruit growth stage, ADP-glucose pyrophosphorylase and amylase activities in source leaves were not significantlyaffected by fruit removal. There was a significantly positive parabolic correlation between Pn and Gs, and a strongpositive linear correlation between Pn and E. Moreover, Pn increased with increased TLeaf if TLeaf was below 38°C, thendecreased 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 TLeaf , especially if TLeaf exceeded 38°C. It is suggested that the decreased stomatal aperture andincreased TLeaf may be the important mechanism in regulating photosynthesis under a decreased strength of sink demandby RF in fruit trees.
文摘为探明窄叶桃叶片秋季的光合作用规律,以油蟠桃品种金霞油蟠和水蜜桃品种湖景蜜露为对照,在果实采收后(8月下旬和9月下旬)研究了窄叶桃品系BYDOP7029叶片的光合特性。结果表明,BYDOP7029的水分利用效率(WUE)日均值相对较高,表观CO2利用效率(CUE)日均值显著高于金霞油蟠、湖景蜜露(P<0.05),蒸腾速率日积分值(DIV of Tr)较金霞油蟠低而表观光能利用效率(LUE)较湖景蜜露高(P<0.05),净光合速率日积分值(DIV of Pn)介于金霞油蟠和湖景蜜露且与2者具有显著性差异(P<0.05),光补偿点(LCP)较低而光饱和点(LSP)较高,表明BY-DOP7029具有较高的水分利用效能和光合效能,生态适应范围较宽。BYDOP7029的净光合速率(Pn)日变化在8月下旬和9月下旬分别表现"双峰型"和"单峰型",但午间Pn降低的原因均为非气孔限制。BYDOP7029的Pn与环境因子日变化的灰色关联分析表明,8月下旬和9月下旬影响其Pn的主要环境因子分别为大气CO2浓度(Ca)和光量子通量密度(PFD)。
