Influence of arbuscular mycorrhizae on photosynthesis and water status of maize plants under salt stress
Influence of arbuscular mycorrhizae on photosynthesis and water status of maize plants under salt stress
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盐胁迫下丛枝菌根对玉米植株光合作用和水分状况的影响
DOI：
10.1007/s00572-008-0180-7
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发表时间：
2008-09-01
期刊：
影响因子：
3.9
通讯作者：
Huang, Yanhui
中科院分区：
文献类型：
--
作者：
Sheng, Min;Tang, Ming;Huang, Yanhui
在温室条件下研究了丛枝菌根真菌Glomus mosseaeon对盐胁迫下玉米生长、水分状况、叶绿素浓度、气体交换和叶绿素荧光特性的影响。玉米植株在沙和土壤混合物中生长，具有五个NaCl水平（0、0.5、1.0、1.5和2.0g/kg干基质）55天，随后进行15天的非盐预处理。盐胁迫下，菌根玉米植株地上部和根系干重较高，叶绿素相对含量较高，水分状况较好（降低水分饱和亏缺，提高水分利用效率和相对含水量），提高气体交换能力（提高光合速率、气孔导度和蒸腾速率，降低胞间CO2浓度），更高的非光化学效率[增加的非光化学猝灭值（NPQ）]，和更高的光化学效率[增加暗适应状态下的最大量子产额（Fv/Fm），光适应状态下的最大量子产额（Fv′/Fm′），光适应稳态下的实际量子产额（QPSII）和光化学猝灭值（qP）]，与非菌根玉米植物相比。此外，AM共生还可以触发光化学和非光化学事件之间能量分叉的调节，反映在去激发速率常数（kN，kN′，kP和kP′）上。结果表明，G. mosseaeae通过改善植物的水分状况、叶绿素浓度和光合能力来缓解盐胁迫对植物生长的不利影响，而AM真菌共生对玉米光合能力的影响可以通过土壤盐分和菌根介导的水分状况的改善来间接影响，而不是通过菌根介导的叶绿素浓度和植物生物量的增加来间接影响。
The influence of arbuscular mycorrhizal (AM) fungusGlomus mosseaeon characteristics of the growth, water status, chlorophyll concentration, gas exchange, and chlorophyll fluorescence of maize plants under salt stress was studied in the greenhouse. Maize plants were grown in sand and soil mixture with five NaCl levels (0, 0.5, 1.0, 1.5, and 2.0 g/kg dry substrate) for 55 days, following 15 days of non-saline pretreatment. Under salt stress, mycorrhizal maize plants had higher dry weight of shoot and root, higher relative chlorophyll content, better water status (decreased water saturation deficit, increased water use efficiency, and relative water content), higher gas exchange capacity (increased photosynthetic rate, stomatal conductance and transpiration rate, and decreased intercellular CO2concentration), higher non-photochemistry efficiency [increased non-photochemical quenching values (NPQ)], and higher photochemistry efficiency [increased the maximum quantum yield in the dark-adapted state (Fv/Fm), the maximum quantum yield in the light-adapted sate (Fv′/Fm′), the actual quantum yield in the light-adapted steady state (ϕPSII) and the photochemical quenching values (qP)], compared with non-mycorrhizal maize plants. In addition, AM symbiosis could trigger the regulation of the energy biturcation between photochemical and non-photochemical events reflected in the deexcitation rate constants (kN, kN′, kP, and kP′). All the results show thatG. mosseaealleviates the deleterious effect of salt stress on plant growth, through improving plant water status, chlorophyll concentration, and photosynthetic capacity, while the influence of AM symbiosis on photosynthetic capacity of maize plants can be indirectly affected by soil salinity and mycorrhizae-mediated enhancement of water status, but not by the mycorrhizae-mediated enhancement of chlorophyll concentration and plant biomass.