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首页> 外文期刊>Scientia horticulturae >Effects of sink removal on leaf photosynthetic attributes of rose flower shoots (Rosa hybrida L., cv. Dallas)
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Effects of sink removal on leaf photosynthetic attributes of rose flower shoots (Rosa hybrida L., cv. Dallas)

机译：去除水槽对玫瑰花枝叶片光合特性的影响（Rosa hybrida L.，cv。Dallas）

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Two experiments were conducted under greenhouse conditions to evaluate the effects of sink removal (flower shoot harvest and debudding) on the gas-exchange capacity (i) of leaves left on the parent shoot after flower shoot harvest and (ii) of flower shoot leaves after flower-bud removal. In the first experiment, gas-exchange measurements were performed on three 5-foliate leaves (leaf 1: uppermost parent shoot leaf, and two leaves inserted just below: leaves 2-3). It was found that, after bud sprouting, the leaf nearest to the young growing shoot (leaf 1) experienced a significant reduction in leaf maximum net CO2 assimilation rate, A(lm), stomatal conductance, g(s) and transpiration rate, E-l, over time in comparison to the corresponding values observed for leaves 2-3. Leaf water use efficiency, WUE, significantly changed over time, while the ratio of leaf internal to ambient CO2 concentration, C-i/C-a, was rather conservative throughout the entire shoot growing period. In the second experiment, leaf gas-exchange measurements were performed for adult flower shoots that were either debudded or left intact. Both types of shoots exhibited a similar along-shoot distribution pattern of physiological fluxes, g(s), and WUE. Bud removal did not significantly affect the magnitude of gas-exchange, with the exception of E-l. One week after bud removal, only slight differences were observed for A(lm). g(s), and E-l, between the two types of shoots. These results suggest (i) that the contribution of the uppermost parent shoot leaf to the assimilates demand of newly growing shoot significantly affects its photosynthetic capacity; and (ii) that flower-bud removal does not change the overall photosynthetic capacity of the flower shoot leaves, which divert the surplus of produced assimilates towards alternative sink organs and plant reserve pools.
机译：在温室条件下进行了两个实验，以评估水槽清除（花芽收获和去芽）对花芽收获后留在母芽上的叶子和（ii）芽后的气体交换能力的影响。花芽清除。在第一个实验中，对三片5叶的叶片进行了气体交换测量（叶片1：最上层的亲生芽叶片，而在其下方插入了两片叶片：叶片2-3）。发现发芽后，最靠近幼苗的叶片（叶1）的叶片最大净CO2同化率A（lm），气孔导度g（s）和蒸腾速率El明显降低。与观察到的叶子2-3的相应值相比，随着时间的推移，叶片水分利用效率WUE随时间发生显着变化，而叶片内部与周围CO2浓度的比率C-i / C-a在整个芽生期间相当保守。在第二个实验中，对没有花芽或完好无损的成年花梢进行了叶片气体交换测量。两种类型的芽均表现出相似的生理通量，g（s）和WUE的顺拍分布模式。除E-1外，芽的去除没有显着影响气体交换的量。去除芽后一周，仅观察到A（lm）的细微差异。 g（s）和E-1，位于两种类型的芽之间。这些结果表明：（i）最上面的亲生芽对新生长芽的同化需求的贡献显着影响了其光合能力; （ii）去除花蕾并不会改变花梢叶的总体光合能力，这会将生产的同化物的剩余部分转移到其他的水槽器官和植物储备池中。

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