title: Influence of leaf vein density and thickness on hydraulic conductance and photosynthesis in rice (Oryza sativa L.) during water stress.
abstract: The leaf venation architecture is an ideal, highly structured and efficient irrigation system in plant leaves. Leaf vein density (LVD) and vein thickness are the two major properties of this system. Leaf laminae carry out photosynthesis to harvest the maximum biological yield. It is still unknown whether the LVD and/or leaf vein thickness determines the plant hydraulic conductance (Kplant) and leaf photosynthetic rate (A). To investigate this topic, the current study was conducted with two varieties under three PEG-induced water deficit stress (PEG-IWDS) levels. The results showed that PEG-IWDS significantly decreased A, stomatal conductance (gs), and Kplantin both cultivars, though the IR-64 strain showed more severe decreases than the Hanyou-3 strain. PEG-IWDS significantly decreased the major vein thickness, while it had no significant effect on LVD. A, gsand Kplantwere positively correlated with each other, and they were negatively correlated with LVD. A, gsand Kplantwere positively correlated with the inter-vein distance and major vein thickness. Therefore, the decreased photosynthesis and hydraulic conductance in rice plants under water deficit conditions are related to the decrease in the major vein thickness.
authors.affiliation: Ministry of Agriculture Key Laboratory of Crop Ecophysiology and Farming System in the Middle Reaches of the Yangtze River, College of Plant Science and Technology, Huazhong Agricultural University, Wuhan, Hubei, China.
authors.forename: Muhammad Adnan
authors.initials: MA
authors.lastname: Tabassum
authors.affiliation: Ministry of Agriculture Key Laboratory of Crop Ecophysiology and Farming System in the Middle Reaches of the Yangtze River, College of Plant Science and Technology, Huazhong Agricultural University, Wuhan, Hubei, China.
authors.forename: Guanglong
authors.initials: G
authors.lastname: Zhu
authors.affiliation: Cotton Physiology Lab for Efficient Production, College of Plant Science and Technology, Huazhong Agricultural University, Wuhan, Hubei, China.
authors.forename: Abdul
authors.initials: A
authors.lastname: Hafeez
authors.affiliation: National Key Laboratory of Crop Genetic Improvement, College of Plant Science and Technology, Huazhong Agricultural University, Wuhan, Hubei, China.
authors.forename: Muhammad Atif
authors.initials: MA
authors.lastname: Wahid
authors.affiliation: National Key Laboratory of Crop Genetic Improvement, College of Plant Science and Technology, Huazhong Agricultural University, Wuhan, Hubei, China.
authors.forename: Muhammad
authors.initials: M
authors.lastname: Shaban
authors.affiliation: Ministry of Agriculture Key Laboratory of Crop Ecophysiology and Farming System in the Middle Reaches of the Yangtze River, College of Plant Science and Technology, Huazhong Agricultural University, Wuhan, Hubei, China.
authors.forename: Yong
authors.initials: Y
authors.lastname: Li
mesh_terms: D003681:Dehydration; D012275:Oryza / Q000502:physiology*; D010788:Photosynthesis; D018515:Plant Leaves / Q000502:physiology*