Chen Ji-Jhong, Sun Youping, Kopp Kelly, Oki Lorence, Jones Scott B, Hipps Lawrence
Department of Plants, Soils, and Climate, Utah State University, Logan, UT, United States.
Department of Plant Sciences, University of California, Davis, Davis, CA, United States.
Front Plant Sci. 2022 May 18;13:855858. doi: 10.3389/fpls.2022.855858. eCollection 2022.
Many arid lands across the globe are experiencing more frequent and extreme droughts due to warmer temperatures resulting from climate change, less predictable precipitation patterns, and decreased soil moisture. Approximately 60-90% of household water is used for urban landscape irrigation in the western United States, necessitating the establishment of landscapes using drought-tolerant plants that conserve water. (hybrid buffaloberry) is a drought-tolerant plant with dense leaf trichomes (epidermal appendages) that may limit excessive water loss by transpiration. However, little is known about how regulates leaf heat balance when transpirational cooling is limited. The objective of this research was to investigate the effects of substrate water availability on plant growth and development and trichome density of . Ninety-six clonally propagated plants were grown using an automated irrigation system, and their substrate volumetric water contents were controlled at 0.05-0.40 m·m for 2 months. Results showed that water stress impaired plant growth and increased the proportion of visibly wilted leaves. acclimates to drought by reducing cell dehydration and canopy overheating, which may be accomplished through decreased stomatal conductance, smaller leaf development, leaf curling, increased leaf thickness, and greater root-to-shoot ratio. Leaf trichome density increased when stem water potential decreased, resulting in greater leaf reflectance of visible light. Cell and leaf expansion were restricted under water stress, and negative correlations were exhibited between epidermal cell size and trichome density. According to our results, plasticity in leaves and roots aids plants in tolerating abiotic stresses associated with drought. Acclimation of to water stress was associated with increased trichome density due to plasticity in cell size. Dense trichomes on leaves reflected more lights which appeared to facilitate leaf temperature regulation.
由于气候变化导致气温升高、降水模式更难以预测以及土壤湿度降低，全球许多干旱地区正经历着更为频繁和极端的干旱。在美国西部，约60%至90%的家庭用水用于城市景观灌溉，因此有必要使用耐旱植物打造节水景观。（杂交水牛果）是一种耐旱植物，其叶片上有密集的毛状体（表皮附属物），可能会限制因蒸腾作用导致的过多水分流失。然而，对于在蒸腾冷却受限的情况下，（杂交水牛果）如何调节叶片热平衡却知之甚少。本研究的目的是调查基质水分有效性对（杂交水牛果）的植物生长发育及毛状体密度的影响。使用自动灌溉系统种植了96株克隆繁殖的植株，并将其基质体积含水量在0.05 - 0.40 m·m下控制2个月。结果表明，水分胁迫会损害植物生长并增加叶片明显萎蔫的比例。（杂交水牛果）通过减少细胞脱水和冠层过热来适应干旱，这可能是通过降低气孔导度、减小叶片发育、叶片卷曲、增加叶片厚度以及提高根冠比来实现的。当茎水势降低时，叶片毛状体密度增加，导致叶片对可见光的反射率更高。在水分胁迫下，细胞和叶片的扩展受到限制，表皮细胞大小与毛状体密度之间呈现负相关。根据我们的研究结果，叶片和根系的可塑性有助于植物耐受与干旱相关的非生物胁迫。（杂交水牛果）对水分胁迫的适应与细胞大小可塑性导致的毛状体密度增加有关。叶片上密集的毛状体反射更多光线，这似乎有助于调节叶片温度。
