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

Abstract

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.

Authors

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Pub Type(s)

Journal Article

Language

eng

PubMed ID

31615621

Citation

Geetika, Geetika, et al. "Genotypic Variation in Whole-plant Transpiration Efficiency in Sorghum Only Partly Aligns With Variation in Stomatal Conductance." Functional Plant Biology : FPB, 2019.
Geetika G, van Oosterom EJ, George-Jaeggli B, et al. Genotypic variation in whole-plant transpiration efficiency in sorghum only partly aligns with variation in stomatal conductance. Funct Plant Biol. 2019.
Geetika, G., van Oosterom, E. J., George-Jaeggli, B., Mortlock, M. Y., Deifel, K. S., McLean, G., & Hammer, G. L. (2019). Genotypic variation in whole-plant transpiration efficiency in sorghum only partly aligns with variation in stomatal conductance. Functional Plant Biology : FPB, doi:10.1071/FP18177.
Geetika G, et al. Genotypic Variation in Whole-plant Transpiration Efficiency in Sorghum Only Partly Aligns With Variation in Stomatal Conductance. Funct Plant Biol. 2019 Oct 16; PubMed PMID: 31615621.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Genotypic variation in whole-plant transpiration efficiency in sorghum only partly aligns with variation in stomatal conductance. AU - Geetika,Geetika, AU - van Oosterom,Erik J, AU - George-Jaeggli,Barbara, AU - Mortlock,Miranda Y, AU - Deifel,Kurt S, AU - McLean,Greg, AU - Hammer,Graeme L, Y1 - 2019/10/16/ PY - 2018/07/04/received PY - 2019/07/01/accepted PY - 2019/10/17/entrez JF - Functional plant biology : FPB JO - Funct. Plant Biol. N2 - 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. SN - 1445-4416 UR - https://www.unboundmedicine.com/medline/citation/31615621/Genotypic_variation_in_whole-plant_transpiration_efficiency_in_sorghum_only_partly_aligns_with_variation_in_stomatal_conductance DB - PRIME DP - Unbound Medicine ER -