| 岳桦幼苗光合特性和非结构性碳水化合物积累对干旱胁迫的响应 |
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| 引用本文： | 马玥,苏宝玲,韩艳刚,吴星慧,周旺明,王庆伟,周莉,于大炮. 岳桦幼苗光合特性和非结构性碳水化合物积累对干旱胁迫的响应[J]. 应用生态学报, 2021, 32(2): 513-520. DOI: 10.13287/j.1001-9332.202102.028 |
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| 作者姓名： | 马玥 苏宝玲 韩艳刚 吴星慧 周旺明 王庆伟 周莉 于大炮 |
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| 作者单位： | 1.沈阳大学生命科学与工程学院, 沈阳 110044;2.中国科学院沈阳应用生态研究所森林生态与管理重点实验室, 沈阳 110016 |
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| 基金项目： | 国家自然科学基金项目(41871105)资助。 |
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| 摘 要： | 以长白山林线树种岳桦为对象,利用生长控制试验进行干旱处理,研究干旱对岳桦幼苗光合特性及非结构性碳水化合物(NSC)积累的影响.结果表明:干旱显著降低了岳桦幼苗的净光合速率和气孔导度,提高了其水分利用效率;干旱显著增加了岳桦幼苗叶、皮、干和根中的可溶性糖和总NSC的含量,但显著降低了淀粉含量;随着干旱的持续,叶片的气孔导...
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| 关 键 词： | 干旱 光合响应 碳平衡 储存策略 高山林线 岳桦 |
| 收稿时间： | 2020-08-18 |
Response of photosynthetic characteristics and non-structural carbohydrate accumulation of Betula ermanii seedlings to drought stress |
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| MA Yue,SU Bao-ling,HAN Yan-gang,WU Xing-hui,ZHOU Wang-ming,WANG Qing-wei,ZHOU Li,YU Da-pao. Response of photosynthetic characteristics and non-structural carbohydrate accumulation of Betula ermanii seedlings to drought stress[J]. The journal of applied ecology, 2021, 32(2): 513-520. DOI: 10.13287/j.1001-9332.202102.028 |
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| Authors: | MA Yue SU Bao-ling HAN Yan-gang WU Xing-hui ZHOU Wang-ming WANG Qing-wei ZHOU Li YU Da-pao |
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| Affiliation: | 1.College of Life Science and Bioengineering, Shenyang University, Shenyang 110044, China;2.Key Laboratory of Forest Ecology and Management, Institute of Applied Ecology, Chinese Academy of Sciences, Shen-yang 110016, China |
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| Abstract: | We explored the effects of drought stress on photosynthetic characteristics and non-structural carbohydrate(NSC) accumulation of the timberline tree species Betula ermanii in Changbai Mountain with a drought control experiment. The results showed that drought significantly reduced the net photosynthetic rate and stomatal conductance, but increased water use efficiency(WUE) of B. ermanii seedlings. Drought dramatically improved the contents of soluble sugar and total NSC in leaves, barks, stems, and roots of B. ermanii seedlings, but significantly reduced their starch content. The stomatal conductance, photosynthetic rate and WUE decreased rapidly as the drought continued, whereas the contents of soluble sugar, starch and NSC increased and then declined. At the end of the experiment, 90% of the leaves turned yellow, and the ratios of soluble sugar to starch in the stems, barks and roots under the drought treatment were significantly higher than those in the control. These results demonstrated that B. ermanii might be a drought-avoidance species that could reduce water loss by rapidly reducing stomatal conductance and improving WUE under drought stress. B. ermanii might have evolved priority storage strategy to cope with water deficit through improving the content of soluble sugar in organs and increasing the transformation rate between starch and sugar. With the extension of drought stress, seedlings tended to die, since water stress might exceed the threshold of the plant self-regulation capacity. However, the content of NSC in organs did not decrease, suggesting that the death of B. ermanii under drought stress might not be caused by carbon starvation. |
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| Keywords: | drought photosynthetic response carbon balance storage policy alpine timberline Betula ermanii |
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