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以“先瑞9号”、“T9938”2个向日葵品种为试材,在其初花期利用Li-6400光合仪,依次从植株顶部到基部测定不同节位叶片的光合作用及光合能力最强叶片的光合作用日变化,以规范测定标准并为比较、分析向日葵叶片光合能力提供指导。结果表明:对不同节位向日葵叶片,光合速率、气孔导度“先瑞9号”以第5节位最高,“T9938”以第6节位最高;蒸腾速率“先瑞9号”以第6节位最高,“T9938”以第7节位最高;胞间CO2浓度“先瑞9号”以第5、6节位最低,“T9938”以第6节位最低;2个品种光合作用能力最强节位叶片分别是“先瑞9号”为第5节位叶片,“T9938”为第6节位叶片,其光合速率、气孔导度均在11:00时达到最高值,胞间CO2浓度在11:00时达到最低值;蒸腾速率“先瑞9号”在13:00时达到最高值,“T9938”在14:00时达到最高值;选择顶部完全发育、完全伸展的最高节位叶片,在11:00时测定,其测定值可代表初花期向日葵叶片的最大光合能力。
Two sunflower cultivars, “Xianrui 9” and “T9938”, were used as materials to study the photosynthesis and photosynthesis of leaves with different leaf positions at the first flowering stage using Li-6400 photosynthesis system, Diurnal changes of photosynthesis of the strongest leaves were observed in order to standardize the determination standard and provide guidance for comparison and analysis of photosynthetic ability of sunflower leaves. The results showed that the highest in the 5th node and the 6th node in the “T9938” were the highest in the leaves with different node positions, the photosynthetic rate, stomatal conductance “Xianrui 9”, the transpiration rate “ Number ”is the highest in the sixth node,“ T9938 ”is the highest in the seventh node, and the intercellular CO2 concentration “ the first Swiss No. 9 ”is the lowest in the fifth and sixth nodes,“ T9938 ” The lowest leaf position of the 6 varieties was the highest leaf position of the photosynthesis ability of the two cultivars. The leaves with the strongest photosynthesis ability of the two varieties were the first leaf of “5th leaf” and the second leaf of “T9938”. The photosynthetic rate, The transpiration reached the highest value at 11:00 and the intercellular CO2 concentration reached the lowest at 11:00. The transpiration rate “Shui-9” reached the highest value at 13:00, “T9938” 14:00 to reach the highest value; select the top of the fully developed, fully extended highest leaf section, measured at 11:00, the measured value can represent the first flowering sunflower leaves maximum photosynthetic capacity.