| 何炎红、田有亮、林涛、边俊荣.水分胁迫对沙冬青气体交换和
叶绿素荧光的影响[J].广东农业科学,2014,41(10):42-47 |
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水分胁迫对沙冬青气体交换和
叶绿素荧光的影响 |
| Influences of water stress on gas exchange and chlorophyllfluorescence parameters of Ammopiptanthus mongolicus |
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| DOI： |
| 中文关键词: 沙冬青 水分胁迫 气体交换 叶绿素荧光指标 |
| 英文关键词: Ammopiptanthus mongolicus water stress gas exchange chlorophyll fluorescence parameters |
| 基金项目:内蒙古自然科学基金（2011BS0509）；内蒙古农
业大学新品种选育创新团队项目 |
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| 中文摘要: |
| 使用LI-6400 光合测定系统及其配备的荧光叶室测定了不同水分状况下沙冬青气体交换及叶绿素荧
光变化特征。结果表明院沙冬青光合速率尧蒸腾速率和气孔导度与水势的关系均可模拟为y=a+b（1原e-kx）、叶绿素荧
光特征指标水势关系呈y=ae-bx^k曲线；沙冬青光合速率尧蒸腾速率尧气孔导度和叶绿素荧光特征指标值随着植物水
势下降均呈下降趋势、光合速率尧蒸腾速率尧气孔导度下降的初始水势（初始胁迫水势）明显小于叶绿素荧光特征
指标、光合速率水势补偿点尧蒸腾速率临界点水势和气孔导度临界点水势与叶绿素荧光特征指标NPQ尧qP 和ETR
初始胁迫水势基本相同、而明显小于荧光指标Fv/Fm 初始胁迫水势。研究指出、可用气孔导度水势临界值作为评
价光合作用气孔调节和非气孔调节的界限、Fv/Fm 水势临界值可作为植物水分胁迫临界值院当水势大于气孔导度
水势临界值时、属于气孔调节水势范围；当水势小于气孔导度水势临界值时、植物以非气孔调节为主。当水势大于
Fv/Fm 水势临界值时、植物处于轻度或中度水分胁迫；当水势小于Fv/Fm 水势临界值时、植物处于重度水分胁迫。
结果表明、沙冬青气孔调节水势临界值为-3.81~-5.26 MPa、重度水分胁迫水势临界值为-8.05~-14.53 MPa、临界
值具有生长季节差异。 |
| 英文摘要: |
| The influences of water stress on gas exchange and chlorophyll fluorescence parameters of Ammopiptanthus
mongolicus were studied using Li-6400 portable photosynthesis system. The results showed that the relationship between
net photosynthesis rate, transpiration rate, stomatal conductance of A. mongolicus and water potential were stimulated by y=
a+b(1原e-kx), and the relation between chlorophyll fluorescence parameters and water potential were y=ae-bx^k. The net
photosynthesis rate, transpiration rate, stomatal conductance and chlorophyll fluorescence parameters of A. mongolicus
decreased under water stress. The initial water stress potential of net photosynthesis rate, transpiration rate and stomatal
conductance were less than those of chlorophyll fluorescence parameters, and the photosynthetic water potential
compensation point, water potential at transpiration rate critical point and stomatal conductance critical point were similar
to those of chlorophyll fluorescence parameters(NPQ, qP and ETR), but that were much less than initial water stress
potential of Fv/Fm. The water potential at stomatal conductance critical point could be used as the limit of estimating the
photosynthetic stomatal and nonstomatal regulation, and the initial water stress potential of Fv/Fm was used as the critical
value of plant water stress. When the water potential was more than the water potential at stomatal conductance critical
point, it belonged to the water potential of stomatal regulation, however, when the water potential was less than the water
potential at stomatal conductance critical point, it belonged to the water potential of nonstomatal regulation. When the water
potential was more than the initial water stress potential of Fv/Fm, it belonged to the mild or moderate water stress, if it
was less than the initial water stress potential of Fv/Fm, it
belonged to heavy water stress. The result showed that the
water potential at stomatal conductance critical point of A .
mongolicus was between -3.81 and -5.26 MPa, and the
critical point of heavy water stress was between -8.05 and
-14.53 MPa, and they had the seasonal difference. |
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