Exploration and Research on the Strongest Photosynthetic Capacity and Diurnal Photosynthetic Dynamics Leaf of Sunflower(PDF)

《北方园艺》[ISSN:1001-0009/CN:23-1247/S]

Title:: Exploration and Research on the Strongest Photosynthetic Capacity and Diurnal Photosynthetic Dynamics Leaf of Sunflower

Author(s):: DU She-ni¹; 2; GENG Gui-jun³; ZHANG Rui⁴; BAI Gang-shuan¹; 2; 1.Institute of Soil and Water Conservation,Northwest Agricultural and Forestry University,Yangling,Shaanxi 712100；
2.Institute of Soil and Water Conservation,Chinese Academy of Sciences and Ministry of Water Resources,Yangling,Shaanxi 712100；
3.Zibo Dean Environment Monitoring Co.,Ltd,Zibo,Shandong 255086；
4.Collage of Forestry,Northwest Agricultural and Forestry University,Yangling Shaanxi 712100

Abstract:: Taking two sunflower varieties of ‘Xianrui 9’,‘T9938’ in early flowering stage as materials,using the Li-6400 portable photosynthesis system,from the top to the base of the plant,different nodes leaves photosynthesis been determined successively,and photosynthesis diurnal change of the strongest photosynthetic capacity leaf been determined soon after.The results showed that the highest photosynthetic rate and the highest stomatal conductance in different nodes leaves of ‘Xianrui 9’ were the 5th node,‘T9938’ were the 6th node.The highest transpiration rate in different nodes leaves of ‘Xianrui 9’ was the 6th node,‘T9938’ was the 7th node.The lowest intercellular CO₂ concentration in different nodes leaves of ‘Xianrui 9’ was the 5th and 6th node,‘T9938’ was the 6th node.The highest photosynthetic rate,stomatal conductance of the strongest photosynthetic capacity leaf (the strongest photosynthetic capacity leaf of ‘Xianrui 9’ was the 5th node,‘T9938’ was the 6th node) of two varieties were at 11:00,the lowest intercellular CO₂ concentration were at 11:00,the highest transpiration rate of ‘Xianrui 9’ was at 13:00,and ‘T9938’ was at 14:00.Selecting the top fully developed,fully extended leaf in the highest node,determining at 11:00,the determination data could represent the biggest photosynthetic capacity of sunflower leaf in early flowering stage.

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Last Update: 2014-08-07