Effects of different calcium concentrations on the growth and physiological characteristics of Dalbergia odorifera under low temperatures
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摘要: 以降香黄檀（Dalbergia odorifera T.Chen）为材料，通过人工控制温度的方法，探讨在不同温度条件下施加不同浓度Ca2+对降香黄檀幼苗生长及生理特性的影响。结果显示：常温条件下，施加不同浓度的Ca2+对降香黄檀的茎高、叶长、净光合速率（Pn）、气孔导度（Gs）、蒸腾速率（Tr）和光合色素含量均有显著影响；而对叶片相对含水量、露点水势、相对电导率、丙二醛（MDA）和可溶性蛋白含量影响较小；促进生长发育的最适Ca2+浓度为5 mmol/L。低温对降香黄檀上述生理指标以及水分利用效率（WUE）均有显著影响；低温条件下施加不同浓度的Ca2+能使上述指标得到不同程度的缓解，提高降香黄檀低温胁迫耐受性的最适浓度为5 mmol/L。隶属函数分析结果表明，常温和低温条件下，外源Ca2+浓度对降香黄檀的调控影响依次为5、10、15、2.5 mmol/L。Abstract: Dalbergia odorifera T. Chen was used to study the effects of different concentrations of exogenous Ca2+ on seedling growth and physiological characteristics under different artificial temperature conditions. Significant effects were found on stem height, leaf length, Pn, Gs, Tr, and photosynthetic pigment content under different concentrations of Ca2+ at normal temperature. However, limited effects were found on the relative water content and dew point water potential of leaves, relative conductivity, MDA, and soluble protein content. The optimum Ca2+ concentration to improve plant growth was 5 mmol/L. In addition, stem height, leaf length, Pn, Gs, Tr, WUE, content of photosynthetic pigment, relative water content, dew point water potential, relative conductivity, MDA, and soluble protein content were significantly affected by cold stress. These negative effects could be alleviated by applying exogenous Ca2+, with the optimal Ca2+ concentration again found to be 5 mmol/L, followed by 10, 15, and 2.5 mmol/L under normal temperature and cold stress. The results of this study provide scientific guidance in regard to the adaptation of D. odorifera to cold stress and its cultivation in low temperature regions of subtropical areas.
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Keywords:
- Dalbergia odorifera /
- Cold stress /
- Calcium /
- Growth development /
- Physiological characteristics
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