Chlorophyll Fluorescence, Photosynthetic and Morphological Characteristics of Waterlogged Sesame Seedlings  

作　　者：Fengying XU Xiaoling WANG Xiurong ZHANG 

机构地区：[1]College of Agronomy, Yangtze University [2]Oil Crops Research Institute, Chinese Academy of Agricultural Sciences

出　　处：《Agricultural Science & Technology》2017年第4期596-601,共6页农业科学与技术（英文版）

基　　金：Supported by China Agriculture Research System of Sesame(CARS-15-1-07);Yangtze University Provincial Key Disciplines of Crop Science for the Financial Support

摘　　要：Two sesame accessions, ZZM2541 and Ezhi-2, with different tolerance to waterlogging were selected, and the seedlings at the 4-true leaf stage were treated by waterlogging for 48 h. Growth parameters were evaluated 1 d before the beginning of waterlogging and on the 3^(rd)day after the removal of waterlogging(DARW). Morphological characteristics of root and chlorophyll fuorescence were measured on the 3^(rd)DARW and leaf gas exchange was measured on the zero, 3^(rd)and 15^(th) DARW. Results showed that sesame accessions ZZM2541 and Ezhi-2 responded to waterlogging in considerably different performance. The stress induced leaf chlorosis and abscission and slowed growth of plant height in both accessions, but symptom occurred seriously in the susceptive Ezhi-2. In the more tolerant ZZM2541, plentiful of adventitious roots formed above the level.All of the average values of maximum fuorescence yield(F_m), quantum efficiency of open PSII centres(F_v/F_m), initial fluorescence(F_v/F_0) and chlorophyll content(Chl) decreased at the 4-true leaf stage in both accessions after suffering to the stress.The decreases of F_m, F_v/F_0 and Chl were more pronounced in Ezhi-2 than in ZZM2541. Less reductions of mean photosynthetic rate(Pn), transpiration rate(Tr), and stomatal conductance(gs) were observed in the leaves of waterlogged ZZM2541 than in waterlogged Ezhi-2(compared to controls), and the leaves of Ezhi-2 showed a higher water use efficiency(WUE) after the removal of waterlogging. Based on the results, it was concluded that the tolerance to waterlogging of ZZM2541 appears to depend on a combination of photosynthetic characteristics responses and morphological adaption.Two sesame accessions, ZZM2541 and Ezhi-2, with different tolerance to waterlogging were selected, and the seedlings at the 4-true leaf stage were treated by waterlogging for 48 h. Growth parameters were evaluated 1 d before the be- ginning of watedogging and on the 3rd day after the removal of watedogging （DARW）. Morphological characteristics of root and chlorophyll fuorescence were measured on the 3rd DARW and leaf gas exchange was measured on the zero, 3rd and 15th DARW. Results showed that sesame accessions ZZM2541 and Ezhi-2 responded to watedogging in considerably different per- formance. The stress induced leaf chlorosis and abscission and slowed growth of plant height in both accessions, but symptom occurred seriously in the susceptive Ezhi-2. In the more tolerant ZZM2541, plentiful of adventitious roots formed above the level. All of the average values of maximum fuorescence yield （Fm）, quantum efficiency of open PSII centres （Fv/Fm）, initial fluores- cence （FvlFo） and chlorophyll content （Chl） decreased at the 4-true leaf stage in both accessions after suffering to the stress. The decreases of Fro, Fv/Fo and Chl were more pronounced in Ezhi-2 than in ZZM2541. Less reductions of mean photosynthet- ic rate （Pn）, transpiration rate （Tr）, and stomatal conductance （gs） were observed in the leaves of waterlogged ZZM2541 than in watedogged Ezhi-2 （compared to controls）, and the leaves of Ezhi-2 showed a higher water use efficiency （WUE） after the re- moval of watedogging. Based on the results, it was concluded that the tolerance to waterlogging of ZZM2541 appears to depend on a combination of photosynthetic characteristics responses and morphological adaption.

关 键 词：Growth parameters PHOTOSYSTEM Chlorophyll content Leaf gas exchange 

分 类 号：S565.3[农业科学—作物学]