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本实验采用3年生实生山杏苗,主要研究不同土壤水分胁迫下,新根内皮层细胞壁二次生长的phi-增厚、细胞核活性以及淀粉粒累积的显微特点及变化规律。实验中根据叶片的WSD水平将水分胁迫分为中度干旱及重度干旱。与对照材料相比,处于水分胁迫下的山杏新根内皮层所出现的phi-增厚现象比较明显,根尖分生组织细胞核活性减弱的同时淀粉粒积累显著增加。皮层细胞phi-增厚的发生可能是新根对于水分胁迫的保护性防御机能的体现。这些特征对于研究根对土壤水分条件的应答有着较为重要的作用。
In this study, the 3-year-old seedlings of wild apricot seedlings were used to study the microscopic characteristics and changes of phi-thickening, nuclear activity and starch accumulation of secondary growth of endothelial cell wall under different soil water stress. In the experiment, the water stress was divided into moderate drought and severe drought according to the WSD level of leaves. Compared with the control material, the phi-thickened appearance of the rhizome arbutin root under water stress was obvious, while the nuclear activity of apical meristematic tissue was weakened while the accumulation of starch granules was significantly increased. The occurrence of phi-thickened cortical cells may be a manifestation of the protective function of new roots to water stress. These characteristics play an important role in studying root response to soil moisture conditions.