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

Weerarathne LVY; Jahufer Z; Schäufele R; Lopez I; Matthew C

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

dc.citation.issue	5
dc.citation.volume	4
dc.contributor.author	Weerarathne LVY
dc.contributor.author	Jahufer Z
dc.contributor.author	Schäufele R
dc.contributor.author	Lopez I
dc.contributor.author	Matthew C
dc.coverage.spatial	United States
dc.date.accessioned	2024-12-12T20:34:41Z
dc.date.available	2024-12-12T20:34:41Z
dc.date.issued	2023-10-10
dc.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
dc.description.confidential	false
dc.edition.edition	October 2023
dc.format.pagination	291-307
dc.identifier.author-url	https://www.ncbi.nlm.nih.gov/pubmed/37829998
dc.identifier.citation	Weerarathne LVY, Jahufer Z, Schäufele R, Lopez I, Matthew C. (2023). 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 Environ Interact. 4. 5. (pp. 291-307).
dc.identifier.doi	10.1002/pei3.10123
dc.identifier.eissn	2575-6265
dc.identifier.elements-type	journal-article
dc.identifier.issn	2575-6265
dc.identifier.pii	PEI310123
dc.identifier.uri	https://mro.massey.ac.nz/handle/10179/72299
dc.language	eng
dc.publisher	John Wiley and Sons Ltd and New Phytologist Foundation
dc.publisher.uri	https://onlinelibrary.wiley.com/doi/10.1002/pei3.10123
dc.relation.isPartOf	Plant Environ Interact
dc.rights	(c) 2023 The Author/s
dc.rights	CC BY 4.0
dc.rights.uri	https://creativecommons.org/licenses/by/4.0/
dc.subject	Lolium perenne L.
dc.subject	deep rooting
dc.subject	drought tolerance
dc.subject	osmotic potential
dc.subject	quantitative genetics
dc.subject	water‐use efficiency
dc.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
dc.type	Journal article
pubs.elements-id	480419
pubs.organisational-group	Other