Study and Analysis on Photosynthetic Characteristics and Agronomic Characters of Semi wild Wheat in Tibet
In this study,50 Xizang semi wild wheat and 3 local bred wheat control varieties were selected.Photosynthetic parameters such as net pho-tosynthetic rate(Pn),stomatal conductance(Gs),intercellular carbon dioxide concentration(Ci)and transpiration rate(Tr)of flag leaves of Xizang semi wild wheat were measured from 0 to 28 days after anthesis by photosynthetic meter,and the agronomic traits such as chlorophyll,plant height,leaf area and dry matter weight on the ground were determined and compared.The results showed that the net photosynthetic rate of Xizang semi wild wheat first increased and then decreased during the filling period,and reached the maximum value 14 days after flowering.In contrast,the net photo-synthetic rate of local bred wheat showed a smaller variation,but remained at a relatively high level overall.In terms of stomatal conductance,the changes of Xizang semi wild wheat were relatively stable,while the stomatal conductance of local bred wheat increased rapidly in the first 14 days of the filling period,and then decreased slightly.The change trend of intercellular carbon dioxide concentration is similar in the two types of wheat,both showing a rise first and then a decline,but the overall value of local bred wheat is slightly higher than that of semi wild wheat in Xizang.The measure-ment results of transpiration rate show that local bred wheat has a higher water use efficiency during the grain filling period,which is conducive to maintaining a higher photosynthesis rate.In addition,the study also found that the leaf area of Xizang semi wild wheat is significantly larger than that of local bred wheat.A larger leaf area is conducive to more efficient photosynthesis,thus accumulating more organic matter,indicating that Xizang semi wild wheat has advantages in photosynthesis and nutrient accumulation.In this study,the photosynthetic rate and related physiological param-eters of Xizang semi wild wheat and local bred wheat during the filling period were systematically compared,which provided an important reference for high-yield breeding of wheat.At the same time,the research results also provide a scientific basis for further exploring the regulatory mechanism of wheat photosynthetic efficiency and improving wheat yield.
万方数据
维普
