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首页> 外文期刊>Australian Journal of Crop Science >Physiological features and growth characters of oil palm (Elaeis guineensis Jacq.) in response to reduced water-deficit and rewatering
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Physiological features and growth characters of oil palm (Elaeis guineensis Jacq.) in response to reduced water-deficit and rewatering

机译：减水和补水对油棕（Elaeis guineensis Jacq。）的生理特性和生长特性的影响

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Optimum irrigation is very important for nursery stock management of F1-hybrid oil palm (Elaeis guineensis Jacq.), constituting a major production cost. Generally, over watering of nursery stock can be a cause of loss of productivity. The aim of this study was to investigate the physiological and biochemical responses of oil palm nursery stock to reduced soil water content (SWC) and during the recovery process. Water deficit treatments, full-irrigation (control; 54% SWC), 4-days withholding irrigation (42% SWC), 8-days withholding irrigation (20% SWC), 12-days withholding irrigation (13% SWC) and 16-days withholding irrigation (6% SWC) were applied uniformly to the oil palm plants. Proline content and relative electrolyte leakage (REL) in the leaf tissues increased, relative to a degree of reduced SWC, especially in ≤20% SWC water deficit stress. Oil palm nursery stock was sensitive to severe water deficit (6-13% SWC), which was identified by physiological changes and growth inhibition and those parameters failed to recover in the re-watering process. During recovery, proline content and REL in extreme water deficit conditions were still enriched, resulting in greater photosynthetic degradation, diminution of chlorophyll fluorescence, reduction of net photosynthetic rate (Pn), and growth retardation. The wilting point of nursery stock oil palm was defined as 20% SWC, below which plants recovered by watering, without toxic symptoms. The study provides useful information for developing irrigation systems for oil palm, especially F1 hybrid nursery stock.
机译：最佳灌溉对于F1混合油棕（Elaeis guineensis Jacq。）的苗木管理非常重要，构成了主要的生产成本。通常，苗圃浇水过多可能会导致生产力下降。这项研究的目的是调查油棕苗木对减少土壤水分（SWC）以及恢复过程中的生理和生化反应。缺水处理，全面灌溉（对照; 54％SWC），4天扣留灌溉（42％SWC），8天扣留灌溉（20％SWC），12天扣留灌溉（13％SWC）和16-将天禁水灌溉（6％SWC）均匀施用于油棕植物。相对于SWC降低的程度，叶片组织中脯氨酸含量和相对电解质渗漏（REL）有所增加，尤其是在SWC水分亏缺≤20％的情况下。油棕苗圃对严重的水分亏缺（6-13％SWC）敏感，水分亏缺通过生理变化和生长抑制来识别，并且这些参数在补水过程中无法恢复。在恢复过程中，极端水分缺乏条件下脯氨酸含量和REL仍然富集，导致更大的光合作用降解，叶绿素荧光减弱，净光合速率（Pn）降低和生长迟缓。苗木油棕的枯萎点定义为SWC的20％，低于该值可通过浇水恢复植物，而没有毒性症状。该研究为开发油棕特别是F1混合苗木灌溉系统提供了有用的信息。

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