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首页> 外文期刊>Physiologia plantarum >Effects of iron chlorosis and iron resupply on leaf xylem architecture, water relations, gas exchange and stomatal performance of field-grown peach (Prunus persica)
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Effects of iron chlorosis and iron resupply on leaf xylem architecture, water relations, gas exchange and stomatal performance of field-grown peach (Prunus persica)

机译：铁黄化和铁补充对田间桃（桃）叶片木质部结构，水分关系，气体交换和气孔性能的影响

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There is increasing evidence suggesting that iron (Fe) deficiency induces not only leaf chlorosis and a decline of photosynthesis, but also structural changes in leaf morphology, which might affect the functionality of leaves. In this study, we investigated the effects of Fe deficiency on the water relations of peach (Prunus persica (L.) Batsch.) leaves and the responses of previously chlorotic leaves to Fe resupply via the root or the leaf. Iron deficiency induced a decline of maximum potential photosystem II (PSII) efficiency (F V/F M), of rates of net photosynthesis and transpiration and of water use efficiency. Iron chlorosis was associated with a reduction of leaf xylem vessel size and of leaf hydraulic conductance. In the course of the day, water potentials in chlorotic leaves remained higher (less negative) than in green leaves. In chlorotic leaves, normal stomatal functioning was disturbed, as evidenced by the lack of opening upon withdrawal of external CO and stomatal closure after sudden illumination of previously darkened leaves. We conclude that the Fe deficiency induced limitations of xylem conductivity elicited a water saving strategy, which poses an additional challenge to plant growth on high pH, calcareous soils. Fertilisation with Fe improved photosynthetic performance but the proper xylem structure and water relations of leaves were not fully restored, indicating that Fe must be available at the first stages of leaf growth and development.
机译：越来越多的证据表明，铁（Fe）的缺乏不仅会引起叶片萎黄和光合作用的下降，而且会引起叶片形态的结构变化，从而可能影响叶片的功能。在这项研究中，我们调查了铁缺乏对桃（Prunus persica（L.）Batsch。）叶片水分关系的影响，以及以前的含氯植物叶片通过根或叶对铁的再补充反应。铁缺乏导致最大潜在光系统II（PSII）效率（F V / F M），净光合作用和蒸腾速率以及水分利用效率下降。萎黄铁与叶片木质部血管大小的减小和叶片水力传导率的降低有关。在一天的过程中，褪绿叶中的水势仍比绿叶中的水势高（负值较小）。在褪绿叶中，正常的气孔功能受到干扰，这是由外部CO撤除时缺乏开孔和突然变暗的先前光照后的气孔关闭所证明的。我们得出的结论是，铁缺乏引起木质部电导率的局限性引发了节水策略，这对高pH钙质土壤上的植物生长提出了额外的挑战。 Fe的施肥提高了光合性能，但叶片的木质部结构和水分关系并未得到充分恢复，这表明Fe在叶片生长和发育的第一阶段必须可用。

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