Effects of Flooding on Photosynthesis, Chlorophyll Fluorescence, and Oxygen Stress in Plants of Varying Flooding Tolerance
Effects of Flooding on Photosynthesis, Chlorophyll Fluorescence, and Oxygen Stress in Plants of Varying Flooding Tolerance
复制标题
DOI：
10.1660/062.115.0102
复制
发表时间：
2012-04-01
期刊：
影响因子：
--
通讯作者：
Maricle, Brian R.
中科院分区：
文献类型：
--
作者：
Caudle, Keri L.;Maricle, Brian R.
洪水的生理效应可以通过植物的光合作用和呼吸作用来解释。测定了高羊茅光合和呼吸过程。(reed canarygrass）、菜豆（Phaseolus vulgaris L.）（common bean）.豌豆(pea)、蚕豆（Vicia faba L.）（broad bean）和Zea mays L.（玉米）经过三天的洪水之后。由此，我们提出了一个关于光合和呼吸代谢的生理耐淹模型。耐水淹能力的结果，以维持光合作用和高气孔导度时，淹没，并避免氧气短缺的根。最耐践踏的属性，观察在湿地草。淹水时，氧对根系呼吸没有限制作用，淹水处理的光合速率和气孔导度增加。耐水淹的玉米和蚕豆是下一个最耐水淹的，如增加光合速率和气孔导度与洪水，但都表现出氧胁迫的迹象，从三天的洪水。对作物生长敏感的菜豆和豌豆受洪水影响最大，特别是菜豆。淹水处理下，豌豆和豌豆的根系经历了氧胁迫。淹水处理降低了光合作用和气孔导度，并有证据表明淹水增加了臭柏的光保护作用。在洪水期间分配光能的光化学能力也似乎与耐洪水。植物耐水淹性主要取决于受影响组织中维持呼吸过程的能力。
Physiological effects of flooding might be interpretable through measures of photosynthesis and respiration in plants. Photosynthesis and respiration processes were measured in Phalaris arundinacea L. (reed canarygrass), Phaseolus vulgaris L. (common bean). Pisum sativum L. (pea), Vicia faba L. (broad bean), and Zea mays L. (maize) following three days of flooding. From this, we propose a model of physiological flooding tolerance regarding photosynthetic and respiratory metabolism. Tolerance to flooding results from an ability to maintain photosynthesis and high stomatal conductance when flooded, and to avoid oxygen shortage in roots. The most flooding-tolerant attributes were observed in the wetland grass Phalaris arundinacea. Oxygen was not limiting for root respiration when flooded, and photosynthetic rates and stomatal conductance increased in the flooding treatment. The flooding tolerant Zea mays and the broad bean Vicia faba were the next most flooding tolerant, as indicated by increased photosynthesis rates and stomatal conductance with flooding, but both displayed signs of oxygen stress from three days of flooding. The flooding-sensitive Phaseolus vulgaris and Pisum sativum were the most impacted by flooding, particularly P. vulgaris. Roots of P. vulgaris and P. sativum experienced oxygen stress in flooded treatments. Photosynthesis and stomatal conductance decreased in flooding treatments, and there was evidence of increased photoprotection with flooding in P. vulgaris. An ability to allocate light energy to photochemistry during flooding also appeared to be related to flooding tolerance. Plant flooding tolerance is mainly determined by an ability to maintain respiratory processes in affected tissues.