Comparison of Photosynthetic Gas Exchange Parameters for Sugarcane Close Relative Species Erianthus fulvus
[Objective] A study on photosynthesis was carried out to examine the variation in gas exchange parameters among Erianthus fulvus clones,aiming at screening germplasm with good photosynthetic capacity and benefiting breeding for varieties with promoted photosynthetic capacity.[Method] Li-6400 photosynthesis system was used for gas exchange measurements of 36 clones of Erianthus fulvus at elongating stage.[Result] The each average value of gas exchange parameters was 17.61 μmol·m2·s1(A),0.15 mol·m2·s1(Gs),163.49 μmol·mol1(Ci),2.17 mmol·m2·s1(E),1.38 MPa (VPDL),124.43 μmol CO2·mol-1H2O(TE),8.12 μmol CO2·mmol1H2O(WUE) and the fold change was 2.28,2.88,2.29,1.96,1.60,1.93,and 1.75,respectively.Coefficient of variation of gas exchange parameters ranged from 11.79％ to 26.79％,in which stomatal conductance had the highest value (26.79％),followed by the net photosynthetic rate a CV value of 21.48％,water use efficiency exhibited the lowest CV with a value of 11.79％.Statistical analysis showed that there was a significant variation in each gas exchange parameter among the clones.Gas exchange parameter correlation analysis showed that net photosynthesis rate was positively correlated with transpiration efficiency,stomatal conductance,water use efficiency,and a negative correlation with leaf vapor pressure deficit.Stomatal conductance showed a positive correlation with internal CO2 concentration,transpiration rate,and a negative correlation with leaf vapor pressure deficit and transpiration rate.Environmental factors correlation analysis showed that leaf vapor pressure deficit had a significant correlation with longitude,but a significant negative correlation with elevation and altitude.According to the altitude,they were divided into high altitude and low altitude and high altitude of clones showed a better photosynthetic capacity than low altitude.Two principal components were picked up whose cumulative variance proportion was up to 89.79％.Elements of photosynthesis,conductance,transpiration rate,and those of internal CO2 concentration,water use efficiency,transpiration efficiency were dominating ones for the first and second principal component,respectively.The 36 clones could be divided into 5 groups by systemic clustering analysis.Accordingly,the groups could be characterized by different levels of photosynthetic capacity or water use efficiency.Five models of fine discrimination were established,with 5 parameters selected from all the ones measured.The discrimination accuracy of the models was up to 99.03％.[Conclusion] The clones in group IV were high in both photosynthetic capacity and water use efficiency and also had rich materials,thus are potential to be used as parents in breeding progress.
国家科技期刊平台
NSTL
万方数据
维普
