四川农业大学学报 ›› 2011, Vol. 29 ›› Issue (03): 311-311.

• 研究论文 • 上一篇    下一篇

高温胁迫对希蒙得木幼苗叶片光合生理特性的影响

张念念1,胡庭兴2   

  1. 1.
    2. 四川农业大学林学院
  • 收稿日期:2011-03-09 修回日期:2011-03-20 出版日期:2011-09-30 发布日期:2011-10-13
  • 通讯作者: 胡庭兴
  • 基金资助:

    国家林业局“948”引进项目

Effects of High-temperature Stress on Physiological Characteristics of Leaves of Simmondsia Chinensis Seedlings

  1. 1.
    2. College of Forestry, Sichuan Agricultural University
  • Received:2011-03-09 Revised:2011-03-20 Online:2011-09-30 Published:2011-10-13
  • Contact: Hu TingXing

摘要:

在人工气候室内采用盆栽土培的方法,研究了不同程度高温胁迫对希蒙得木幼苗叶片光合作用和相关生理指标的影响。结果表明,对照(CK)叶片净光合速率(Pn)日变化呈“双峰”型,高温处理后叶片净光合速率日变化呈“单峰”型,T1和T2处理比CK同一时间峰值分别下降了17.4 %和35.5 %。T1和T2处理叶片的蒸腾速率(Tr)显著降低,气孔导度(Gs)日变化均随高温胁迫强度的加剧而极显著下降(P < 0.01),高温胁迫使叶片胞间CO2浓度(Ci)升高,这说明高温胁迫下希蒙得木幼苗叶片光合能力降低主要是受非气孔因素限制。此外,高温胁迫下的希蒙得木幼苗叶片相对含水量(LRWC)极显著降低(P < 0.01),叶绿素含量(Chl)显著降低,叶片相对电导率、丙二醛含量(MDA)、超氧化物歧化酶活性(SOD)、过氧化物酶活性(POD)、脯氨酸含量(Pro)和可溶性糖含量均随高温胁迫强度的加剧而显著升高(P < 0.05)。试验表明希蒙得木具有较高的耐热能力。关键词:希蒙得木;高温胁迫;光合;生理特性

关键词: 希蒙得木, 高温胁迫, 光合, 生理特性

Abstract:

Using phytotron to simulate high temperature environment, the physiological characteristics of leaves of S. chinensis under different degree of high-temperature stress (CK, T1, T2) were studied. The results showed that diurnal change of net photosynthetic rate (Pn)of CK was double peak type, but those under T1 and T2 were single-peak type and they decreased 17.4 % and 35.5 % respectively than CK. Transpiration rate(Tr)and stomata conductance(Gs) decreased significantly with the intensification of the stress temperature. But the intercellular CO2 concentration(Ci)increased with the intensification of the stress temperature. It showed that the decreasing of Pn wasn’t mainly stomata factor. Moreover, the leaf relative water content(LRWC)decreased significantly(P < 0.01). The content of chlorophyll (Chl),relative conductivity, the content of malondialdehyde(MDA), the activity of peroxidase(POD) and superoxide dismutase(SOD), Proline(Pro) and soluble sugar increased significantly with the intensification of the stress temperature(P < 0.05). The research indicated that S. chinensis had a good high-temperature resistance capability.

Key words: Simmondsia Chinensis, High-temperature Stress, Photosynthesis, physiological characteristics