A comparative analysis of agronomic water‐use efficiency and its proxy measures as derived from key morpho‐physiological and supportive quantitative genetics attributes of perennial ryegrass under imposed drought
Abstract Water‐use efficiency (WUE) is an under‐researched but very important drought tolerance trait in forage breeding. This research estimated quantitative genetic parameters of morpho‐physiological traits linked to agronomic water‐use efficiency (WUEA) and its proxy measures based on δ13C (WUEi)...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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Wiley
2023-10-01
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| Series: | Plant-Environment Interactions |
| Subjects: | |
| Online Access: | https://doi.org/10.1002/pei3.10123 |
| _version_ | 1827795912540291072 |
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| author | L. V. Y. Weerarathne Z. Jahufer R. Schäufele I. Lopez C. Matthew |
| author_facet | L. V. Y. Weerarathne Z. Jahufer R. Schäufele I. Lopez C. Matthew |
| author_sort | L. V. Y. Weerarathne |
| collection | DOAJ |
| description | Abstract Water‐use efficiency (WUE) is an under‐researched but very important drought tolerance trait in forage breeding. This research estimated quantitative genetic parameters of morpho‐physiological traits linked to agronomic water‐use efficiency (WUEA) and its proxy measures based on δ13C (WUEi) or gas exchange (evapotranspiration, WUEAET, or stomatal conductance WUEASC) of genotypes from half‐sib families of Lolium perenne L. (PRG) in a simulated summer drought cycle. Principal component analysis (PCA) of trait data distinguished a group of PRG genotypes where high WUEA and dry matter yield was associated with deep rooting, leaf hydration at more negative leaf osmotic and water potential, and reduced soil moisture depletion. Plants with this trait association sustained net assimilation and postdefoliation regrowth in drought. However, WUEi, WUEASC, and WUEAET were poorly correlated with most traits of interest at p < .05. Another PCA revealed a weak association between WUEA and its proxy measures under conditions tested. Quantitative genetic parameters including high estimates of narrow‐sense heritability (hn2>0.7;p<.05) of WUEA and related traits emphasized the genetic potential of the key trait combination for selecting PRG for improved drought tolerance. Research findings highlight the relative importance of WUEA and its proxy measures in the broad definition of PRG drought tolerance for breeding purposes. |
| first_indexed | 2024-03-11T18:57:05Z |
| format | Article |
| id | doaj.art-f94a0ee68f324dea8dc978a39d615ae6 |
| institution | Directory Open Access Journal |
| issn | 2575-6265 |
| language | English |
| last_indexed | 2024-03-11T18:57:05Z |
| publishDate | 2023-10-01 |
| publisher | Wiley |
| record_format | Article |
| series | Plant-Environment Interactions |
| spelling | doaj.art-f94a0ee68f324dea8dc978a39d615ae62023-10-10T18:41:51ZengWileyPlant-Environment Interactions2575-62652023-10-014529130710.1002/pei3.10123A comparative analysis of agronomic water‐use efficiency and its proxy measures as derived from key morpho‐physiological and supportive quantitative genetics attributes of perennial ryegrass under imposed droughtL. V. Y. Weerarathne0Z. Jahufer1R. Schäufele2I. Lopez3C. Matthew4Department of Crop Science, Faculty of Agriculture University of Peradeniya Peradeniya Sri LankaSchool of Agriculture and Food Sciences, Faculty of Science The University of Queensland Brisbane Queensland AustraliaCrop Physiology, School of Life Sciences Technical University of Munich Freising GermanySchool of Agriculture and Environment, College of Sciences Massey University Palmerston North New ZealandSchool of Agriculture and Environment, College of Sciences Massey University Palmerston North New ZealandAbstract Water‐use efficiency (WUE) is an under‐researched but very important drought tolerance trait in forage breeding. This research estimated quantitative genetic parameters of morpho‐physiological traits linked to agronomic water‐use efficiency (WUEA) and its proxy measures based on δ13C (WUEi) or gas exchange (evapotranspiration, WUEAET, or stomatal conductance WUEASC) of genotypes from half‐sib families of Lolium perenne L. (PRG) in a simulated summer drought cycle. Principal component analysis (PCA) of trait data distinguished a group of PRG genotypes where high WUEA and dry matter yield was associated with deep rooting, leaf hydration at more negative leaf osmotic and water potential, and reduced soil moisture depletion. Plants with this trait association sustained net assimilation and postdefoliation regrowth in drought. However, WUEi, WUEASC, and WUEAET were poorly correlated with most traits of interest at p < .05. Another PCA revealed a weak association between WUEA and its proxy measures under conditions tested. Quantitative genetic parameters including high estimates of narrow‐sense heritability (hn2>0.7;p<.05) of WUEA and related traits emphasized the genetic potential of the key trait combination for selecting PRG for improved drought tolerance. Research findings highlight the relative importance of WUEA and its proxy measures in the broad definition of PRG drought tolerance for breeding purposes.https://doi.org/10.1002/pei3.10123deep rootingdrought toleranceLolium perenne L.osmotic potentialquantitative geneticswater‐use efficiency |
| spellingShingle | L. V. Y. Weerarathne Z. Jahufer R. Schäufele I. Lopez C. Matthew A comparative analysis of agronomic water‐use efficiency and its proxy measures as derived from key morpho‐physiological and supportive quantitative genetics attributes of perennial ryegrass under imposed drought Plant-Environment Interactions deep rooting drought tolerance Lolium perenne L. osmotic potential quantitative genetics water‐use efficiency |
| title | A comparative analysis of agronomic water‐use efficiency and its proxy measures as derived from key morpho‐physiological and supportive quantitative genetics attributes of perennial ryegrass under imposed drought |
| title_full | A comparative analysis of agronomic water‐use efficiency and its proxy measures as derived from key morpho‐physiological and supportive quantitative genetics attributes of perennial ryegrass under imposed drought |
| title_fullStr | A comparative analysis of agronomic water‐use efficiency and its proxy measures as derived from key morpho‐physiological and supportive quantitative genetics attributes of perennial ryegrass under imposed drought |
| title_full_unstemmed | A comparative analysis of agronomic water‐use efficiency and its proxy measures as derived from key morpho‐physiological and supportive quantitative genetics attributes of perennial ryegrass under imposed drought |
| title_short | A comparative analysis of agronomic water‐use efficiency and its proxy measures as derived from key morpho‐physiological and supportive quantitative genetics attributes of perennial ryegrass under imposed drought |
| title_sort | comparative analysis of agronomic water use efficiency and its proxy measures as derived from key morpho physiological and supportive quantitative genetics attributes of perennial ryegrass under imposed drought |
| topic | deep rooting drought tolerance Lolium perenne L. osmotic potential quantitative genetics water‐use efficiency |
| url | https://doi.org/10.1002/pei3.10123 |
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