Increased density facilitates plant acclimation to drought stress in the emergent macrophyte Polygonum hydropiper
Increased density facilitates plant acclimation to drought stress in the emergent macrophyte Polygonum hydropiper
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密度增加有利于挺水植物蓼对干旱胁迫的适应
DOI：
10.1016/j.ecoleng.2014.07.029
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发表时间：
2014-10
影响因子：
3.8
通讯作者：
Jiayu Hu
中科院分区：
文献类型：
--
作者：
Bingbing Song;Youzhi Li;Yue Tang;Jiayu Hu
由于水位波动较大，湿地植物经常经历干旱事件；在许多湿地，干旱对植物生存的限制可能比洪水更大。较高的密度可以增加相对湿度，有利于植物对干旱胁迫的适应。然而，关于植物密度对干旱适应的影响研究较少。本研究旨在通过对蓼形态和生理特征的研究，阐明密度对植物对干旱胁迫响应的影响。洞庭湖湿地优势种之一的黄花变种。试验温室处理包括三种密度（16、144和400株m - 2）和三种水位（相对于土壤表面0、- 20和- 40 cm）处理，采用因子设计。土壤含水量随水位和植物密度的增加而增加。在0和- 20 cm水位处理下，随密度的增加，单株生物量积累显著降低。而在−40 cm处理下，3种植物密度间生物量积累没有变化。密度和水位越高，叶片质量分数越低。电解质泄漏量和丙二醛（MDA）含量均随水位的降低而增加。此外，在0和- 20 cm水位处理下，它们没有随密度变化，但在- 40 cm水位处理下，它们随密度的增加而下降。可溶性糖含量随水位的降低和密度的增加而增加，淀粉含量随水位的降低而显著降低。这些数据表明，较高的密度有利于p的驯化。输水管道干旱胁迫。此外，我们的研究结果可能揭示了密度在植被恢复中的重要作用。hydropipercommunities。
Wetland plants frequently experience drought events due to large water level fluctuations; drought might present a greater limitation to plant survival than flooding in many wetlands. High plant density can increase the relative humidity, which might facilitate the acclimation of plants to drought stress. However, studies on the effects of plant density on acclimation to drought are scarce. This study aimed to elucidate the influence of density on plant response to drought stress by investigating morphological and physiological characteristics ofPolygonum hydropiperL. var.flaccidum, one of the dominant species in the Dongting Lake wetland, China. Experimental greenhouse treatments, including three density (16, 144, and 400 plants m−2) and three water level (0, −20, and −40 cm relative to the soil surface) treatments, were performed in a factorial design. Soil water content increased with increasing water level and plant density. In the 0- and −20 cm water level treatments, biomass accumulation per plant decreased significantly with increasing density. However, in the −40 cm treatment, biomass accumulation did not change among the three plant densities. Higher density and water level led to lower leaf mass fraction. Both electrolyte leakage and malondialdehyde (MDA) content increased along with decrease in water level. Moreover, they showed no change with plant density in the 0- and −20 cm water level treatments, but decreased with increased density in the −40 cm treatment. Soluble sugar content increased with decreasing water level and increasing density, whereas starch content decreased significantly with decreasing water level. These data indicate that a higher density facilitates the acclimation ofP. hydropiperto drought stress. Moreover, our results might reveal the important role of density in the restoration ofP. hydropipercommunities.
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影响因子：
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作者：
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通讯作者：
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作者：
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5.7
作者：
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