| 摘要: |
| 为探究诗琳通木兰 Magnolia sirindhorniae 对干旱胁迫的生理响应, 文章采用盆栽控水法, 对诗
琳通木兰幼苗在干旱胁迫过程中发生的形态和生理特性变化进行了研究。 结果表明, (1) 轻度干旱胁迫
(为田间最大持水量的 55% ~60%) 下诗琳通木兰形态无明显变化, 重度干旱胁迫 (为田间最大持水量的
15% ~20%) 下叶片发黄萎蔫, 严重时脱落枯萎; (2) 中度 (为田间最大持水量的 35% ~ 40%)、 重度干
旱胁迫 40 d 后株高、 地径净增长量和叶片相对含水量显著降低 (P<0. 05); (3) 与对照相比, 中度、 重
度干旱胁迫 40 d 后相对电导率、 丙二醛 (MDA) 含量、 可溶性蛋白、 脯氨酸、 淀粉含量和可溶性糖含量
均显著增加 (P<0. 05), 超氧化物歧化酶、 过氧化物酶、 过氧化氢酶活性呈先升后降趋势; (4) 相关性
分析和主成分分析表明, 株高净增长量、 过氧化物酶活性、 地径净增长量可作为诗琳通木兰耐旱性的主
要评价指标; 可溶性糖含量、 淀粉含量可作为辅助评价指标。 综上, 研究发现诗琳通木兰能适应轻度干
旱胁迫, 初步明确了其耐旱程度。 |
| 关键词: 诗琳通木兰 形态变化 生理响应 干旱胁迫 |
| DOI： |
| 分类号: |
| 基金项目:广东省林业科技创新专项资金项目 (2017KJCX0023) |
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| Physiological Response of Magnolia sirindhorniae to Drought Stress |
|
XIE Wei, YIN Ruoyong, WEN Menglin, ZHANG Baojin, DENG Xiaomei
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South China Agricultural University / Guangdong Key Laboratory for Innovative Development and Utilization of Forest Plant Germplasm,Guangzhou
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| Abstract: |
| To elucidate the physiological responses of Magnolia sirindhorniae to drought stress, this study
examined the morphological and physiological changes in M. sirindhorniae seedlings subjected to drought stress,
employing a potting method with controlled watering. The results showed that, (1) There was no significant
change in the morphology of M. sirindhorniae under mild drought stress ( 55% - 60% of the maximum water
holding capacity in the field). Under severe drought stress (15%-20% of the maximum water holding capacity
in the field), the leaves turned yellow, wilted, and fell off, in severe cases, they withered. ( 2) Under
moderate (35%-40% of the maximum water holding capacity in the field) and severe drought stress, the net
growth in plant height, basal stem diameter, and relative leaf water content significantly decreased after 40 days
(P<0. 05). (3) Compared to the control, moderate and severe drought stress significantly increased relative
conductivity, malondialdehyde (MDA) content, soluble protein, proline, starch, and soluble sugar content
after 40 days (P<0. 05). The activities of superoxide dismutase (SOD), peroxidase ( POD), and catalase (CAT) initially increased and then decreased. (4) Correlation and principal component analyses indicated that
net growth in plant height, SOD activity, and basal stem diameter net growth could serve as primary indicators
of drought tolerance in M. sirindhorniae, while soluble sugar and starch content may be utilized as auxiliary indicators. In conclusion, this study demonstrates that M. sirindhorniae can adapt to mild drought stress, initially
clarifying its drought tolerance. |
| Key words: Magnolia sirindhorniae morphological changes physiological response drought stress |
