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Morpho-anatomical and physiological responses of two Dendranthema species to waterlogging

机译：两种树皮植物对涝渍的形态解剖和生理响应

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The responses to waterlogging of the two Dendranthema species D. nankingense (Nakai) Tzvel. and D. zawadskii (Herb.) Tzvel. contrast considerably. Although the stress induced wilting and leaf chlorosis in both species, symptoms were more apparent and appeared earlier in the intolerant D. nankingense. In the more tolerant D. zawadskii, adventitious roots formed above the flooding level, and aerenchyma developed in the root, stem and leaf. The D. zawadskii palisade parenchyma was thicker, and larger intercellular spaces developed in the spongy mesophyll. The activities of alcohol dehydrogenase, pyruvate decarboxylase and lactate dehydrogenase were enhanced in roots of both species following the imposition of stress. In D. zawadskii the rise in ADH activity was more pronounced, while D. nankingense showed a significantly higher LDH activity. The activities of superoxide dismutase, ascorbate peroxidase and catalase were all higher in the leaves of D. zawadskii than in D. nankingense, and the leaves of D. nankingense showed a higher content of malondialdehyde throughout the period of waterlogging. Photosynthesis was decreased in both species, and there was a significant fall in the intercellular CO concentration in D. zawadskii. These data suggested that the greater relative waterlogging tolerance of D. zawadskii appears to depend on a combination of metabolic and morpho-anatomical responses.
机译：两种Dendranthema物种D. nankingense（Nakai）Tzvel对渍水的响应。和D. zawadskii（草药）Tzvel。对比明显。尽管在这两个物种中，胁迫都会导致枯萎和叶片萎黄，但症状更加明显，并且在不耐病的南京金缕梅中更早出现。在容忍度较高的D. zawadskii中，不定根在洪水位以上形成，根部，茎和叶中形成气孔。 D. zawadskii木栅薄壁组织较厚，在海绵状叶肉中发育出较大的细胞间空间。施加胁迫后，两个物种的根中醇脱氢酶，丙酮酸脱羧酶和乳酸脱氢酶的活性均增强。在D. zawadskii中，ADH活性的升高更为明显，而D. nankingense显示出明显更高的LDH活性。 Zawadskii叶片中的超氧化物歧化酶，抗坏血酸过氧化物酶和过氧化氢酶的活性均高于南京金丝猴，并且在整个涝期间，南京金丝猴的叶片中丙二醛含量较高。两种物种的光合作用均降低，扎氏梭菌的细胞间CO浓度显着下降。这些数据表明，D。zawadskii的更大的相对涝渍耐受性似乎取决于代谢和形态解剖学响应的组合。

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