Genotypic variation in whole-plant transpiration efficiency in sorghum only partly aligns with variation in stomatal conductance

Autor:	Kurt Deifel, Graeme Hammer, Erik van Oosterom, Geetika Geetika, Greg McLean, M. Y. Mortlock, Barbara George-Jaeggli
Rok vydání:	2019
Předmět:	0106 biological sciences 0301 basic medicine Stomatal conductance Genotype Vapor Pressure Vapour Pressure Deficit Plant Science Biology 01 natural sciences 03 medical and health sciences chemistry.chemical_compound Sorghum Transpiration Biomass (ecology) fungi food and beverages Plant Transpiration biology.organism_classification Photosynthetic capacity Droughts 030104 developmental biology Agronomy chemistry Chlorophyll Shoot Agronomy and Crop Science 010606 plant biology & botany
Zdroj:	Functional Plant Biology. 46:1072
ISSN:	1445-4408
DOI:	10.1071/fp18177
Popis:	Water scarcity can limit sorghum (Sorghum bicolor (L.) Moench) production in dryland agriculture, but increased whole-plant transpiration efficiency (TEwp, biomass production per unit of water transpired) can enhance grain yield in such conditions. The objectives of this study were to quantify variation in TEwp for 27 sorghum genotypes and explore the linkages of this variation to responses of the underpinning leaf-level processes to environmental conditions. Individual plants were grown in large lysimeters in two well-watered experiments. Whole-plant transpiration per unit of green leaf area (TGLA) was monitored continuously and stomatal conductance and maximum photosynthetic capacity were measured during sunny conditions on recently expanded leaves. Leaf chlorophyll measurements of the upper five leaves of the main shoot were conducted during early grain filling. TEwp was determined at harvest. The results showed that diurnal patterns in TGLA were determined by vapour pressure deficit (VPD) and by the response of whole-plant conductance to radiation and VPD. Significant genotypic variation in the response of TGLA to VPD occurred and was related to genotypic differences in stomatal conductance. However, variation in TGLA explained only part of the variation in TEwp, with some of the residual variation explained by leaf chlorophyll readings, which were a reflection of photosynthetic capacity. Genotypes with different genetic background often differed in TEwp, TGLA and leaf chlorophyll, indicating potential differences in photosynthetic capacity among these groups. Observed differences in TEwp and its component traits can affect adaptation to drought stress.
Databáze:	OpenAIRE
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