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首页> 外文期刊>Plant physiology >Is Change in Ovary Carbon Status a Cause or a Consequence of Maize Ovary Abortion in Water Deficit during Flowering?
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Is Change in Ovary Carbon Status a Cause or a Consequence of Maize Ovary Abortion in Water Deficit during Flowering?

机译：开花过程中缺水会导致卵巢碳状况的变化或导致玉米卵巢流产的后果吗？

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Flower or grain abortion causes large yield losses under water deficit. In maize (Zea mays), it is often attributed to a carbon limitation via the disruption of sucrose cleavage by cell wall invertases in developing ovaries. We have tested this hypothesis versus another linked to the expansive growth of ovaries and silks. We have measured, in silks and ovaries of well-watered or moderately droughted plants, the transcript abundances of genes involved in either tissue expansion or sugar metabolism, together with the concentrations and amounts of sugars, and with the activities of major enzymes of carbon metabolism. Photosynthesis and indicators of sugar export, measured during water deprivation, suggested sugar export maintained by the leaf. The first molecular changes occurred in silks rather than in ovaries and involved genes affecting expansive growth rather than sugar metabolism. Changes in the concentrations and amounts of sugars and in the activities of enzymes of sugar metabolism occurred in apical ovaries that eventually aborted, but probably after the switch to abortion of these ovaries. Hence, we propose that, under moderate water deficits corresponding to most European drought scenarios, changes in carbon metabolism during flowering time are a consequence rather than a cause of the beginning of ovary abortion. A carbon-driven ovary abortion may occur later in the cycle in the case of carbon shortage or under very severe water deficits. These findings support the view that, until the end of silking, expansive growth of reproductive organs is the primary event leading to abortion, rather than a disruption of carbon metabolism.
机译：在缺水的情况下，花或谷类流产会导致大量的产量损失。在玉米（Zea mays）中，它通常归因于发育中的卵巢中通过细胞壁转化酶破坏蔗糖裂解引起的碳限制。我们将该假设与与卵巢和丝线的广泛生长相关的另一个假设进行了检验。我们已经在水分充足或中度干旱的植物的丝和卵巢中测量了参与组织扩张或糖代谢的基因的转录本丰度，以及糖的浓度和含量，以及碳代谢的主要酶的活性。在缺水期间测得的光合作用和食糖出口指标表明叶片维持了食糖出口。最初的分子变化发生在丝绸而不是卵巢中，并且涉及影响膨胀生长而不是糖代谢的基因。糖的浓度和数量以及糖代谢酶活性的变化发生在最终终止的心尖卵巢中，但很可能是在这些卵巢转变为流产之后。因此，我们建议，在与大多数欧洲干旱情景相对应的适度缺水情况下，开花期碳代谢的变化是卵巢流产开始的结果而不是原因。如果碳缺乏或在严重缺水的情况下，碳驱动的卵巢流产可能会在周期的后期发生。这些发现支持了这样一种观点，即直到蚕丝期结束之前，生殖器官的广泛生长是导致流产而不是破坏碳代谢的主要事件。

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