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首页> 外文期刊>The Kasetsart Journal >Physiological Responses Of Four Eucalyptus Camaldulensis Clones To Waterlogging In A Hydroponic System
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Physiological Responses Of Four Eucalyptus Camaldulensis Clones To Waterlogging In A Hydroponic System

机译：水培系统中四种桉树无性系对涝渍的生理响应

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Waterlogging has a detrimental effect on environmental stress in Eucalyptus camaldulensis (Dehn.), as does calcareous soil, while together they act synergistically to induce stress in the plants. In the western region of Thailand, both conditions are deleterious to the eucalypt plantation industry. These stresses can reduce the biomass and yield of eucalypts at all stages of growth. To assist the eucalypt breeding program, powerful tools to screen a population are needed. Leaf gas exchange parameters can be used to study the photosynthetic capacity of plants during flooding, except in some flood-tolerant plants that have developed adaptive mechanisms to better maintain photosynthetic capacity. In this study, a physiological method was developed and applied to four Eucalyptus camaldulensis (Dehn.) clones to screen for the effects of waterlogging on net photosynthesis, maximum quantum yield, chlorophyll content and biomass. Four two-month-old eucalypt clones (C1 and C2 were calcicole clones and C3 and C4 were calcifuge clones) were grown in half-strength Hoagland's solution and subjected to waterlogging conditions for 16 days. Physiological parameters were monitored at days 0, 8 and 16 under a plant growth incubator. The net photosynthetic rate (A_(max)), stomatal conductance (g_s) and transpiration rate (E) rapidly reduced in C2 and C4 after 16 days of waterlogging. The maximum quantum yield (F_v/F_m), chlorophyll content and biomass of the four clones decreased in all cultivars under waterlogging at day 16. From measured physiological parameters, C2 and C4 suffered more severe stress under waterlogging than C1 and C3. Overall, a difference between the control and treated plants could be observed at 16 days after treatment. The physiological parameters of gas exchange and the F_v/F_m ratio were proven to be suitable indicators of waterlogging-tolerant traits.
机译：涝和钙质土壤对桉树（Dehn。）的环境胁迫都有不利影响，而它们一起协同作用以诱导植物的胁迫。在泰国西部地区，这两种情况都对桉树种植业有害。这些压力可能会在生长的所有阶段降低桉树的生物量和产量。为了协助桉树育种计划，需要强大的工具来筛选种群。叶片气体交换参数可用于研究水灾期间植物的光合能力，但在某些已开发出适应机制以更好地维持光合能力的耐水植物中，则除外。在这项研究中，开发了一种生理方法，并将其应用于四个桉树无性系（Dehn。），以筛选渍水对净光合作用，最大量子产量，叶绿素含量和生物量的影响。在两个半月龄的Hoagland's溶液中生长四个两个月大的桉树克隆（C1和C2是钙化细菌克隆，C3和C4是钙化菌克隆），并在淹水条件下生长16天。在植物生长培养箱中在第0、8和16天监测生理参数。淹水16天后，C2和C4的净光合速率（A_（max）），气孔导度（g_s）和蒸腾速率（E）迅速降低。在第16天，所有品种在淹水后的最大量子产量（F_v / F_m），叶绿素含量和生物量均下降。从测得的生理参数来看，C2和C4的涝渍胁迫比C1和C3更为严重。总体而言，在处理后16天可以观察到对照植物与处理植物之间的差异。气体交换的生理参数和F_v / F_m比被证明是耐涝性状的合适指标。

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