AI Article Synopsis
- - Identifying whole-plant water use efficiency (WUE) in crops requires easily measurable traits, but traditional gas exchange methods are slow and may not adequately capture the leaf's performance over time.
- - Leaf carbon stable isotope composition (δ C) has emerged as a potential quicker proxy for assessing WUE, though a clear genetic relationship between δ C and WUE has not been thoroughly examined.
- - Research using a recombinant inbred line (RIL) population of two C grasses showed that δ C is genetically linked to WUE, with three quantitative trait loci (QTL) identified, supporting δ C as a viable tool for screening WUE in these plant species.
Article Abstract
Genetic selection for whole-plant water use efficiency (yield per transpiration; WUE ) in any crop-breeding programme requires high-throughput phenotyping of component traits of WUE such as intrinsic water use efficiency (WUE ; CO assimilation rate per stomatal conductance). Measuring WUE by gas exchange measurements is laborious and time consuming and may not reflect an integrated WUE over the life of the leaf. Alternatively, leaf carbon stable isotope composition (δ C ) has been suggested as a potential time-integrated proxy for WUE that may provide a tool to screen for WUE . However, a genetic link between δ C and WUE in a C species has not been well established. Therefore, to determine if there is a genetic relationship in a C plant between δ C and WUE under well watered and water-limited growth conditions, a high-throughput phenotyping facility was used to measure WUE in a recombinant inbred line (RIL) population created between the C grasses Setaria viridis and S. italica. Three quantitative trait loci (QTL) for δ C were found and co-localized with transpiration, biomass accumulation, and WUE . Additionally, WUE for each of the δ C QTL allele classes was negatively correlated with δ C , as would be predicted when WUE influences WUE . These results demonstrate that δ C is genetically linked to WUE , likely to be through their relationship with WUE , and can be used as a high-throughput proxy to screen for WUE in these C species.
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| http://dx.doi.org/10.1111/tpj.14696 | DOI Listing |
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