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dc.contributor.authorWilliams, Jessica L.
dc.contributor.authorSherman, Jamie D.
dc.contributor.authorLamb, Peggy F.
dc.contributor.authorCook, Jason
dc.contributor.authorLachowiec, Jennifer A.
dc.contributor.authorBourgault, Maryse
dc.identifier.citationWilliams, J. L., Sherman, J. D., Lamb, P., Cook, J., Lachowiec, J. A., & Bourgault, M. (2022). Relationships between roots, the stay‐green phenotype, and agronomic performance in barley and wheat grown in semi‐arid conditions. The Plant Phenome Journal, 5(1), e220050.en_US
dc.description.abstractStay-green is a phenotype that crop breeders could use to improve drought adaptation. It increases the duration of grain fill in several species including barley (Hordeum vulgare L.) and wheat (Triticum aestivum L.), maintaining yield in semi-arid conditions. Evidence from controlled environment experiments suggests a connection between stay-green and root systems. These belowground structures are understudied and thus represent opportunity for crop improvement if relationships to agronomics can be understood. Minirhizotrons facilitate study of these relationships by allowing repeated nondestructive root measurements in field conditions. However, this is time-consuming, and proxies would be useful for increasing throughput capacity of root research. Here we present results from field trials with minirhizotrons in a semi-arid environment, as well as greenhouse seedling assays conducted on stay-green and non-stay-green barley and wheat lines. In barley, stay-green and greater yield were primarily associated with greater deep root length and delayed root senescence, whereas in wheat, yield was most strongly correlated with total root length, and root system differences for stay-green were not as apparent. We speculate that the physiology of stay-green is different between these two species, and that barley may use a more efficient root system to withstand drought whereas wheat relies on a larger one. Several seedling traits related consistently to field root traits, but correlation directions were often opposite between barley and wheat. The connections between traits presented here could be useful for breeders seeking to improve crop adaptation to drought, but more genotypes and environments will need to be tested.en_US
dc.subjectstay-green phenotypeen_US
dc.subjectagronomic performanceen_US
dc.subjectsemi-arid conditionsen_US
dc.titleRelationships between roots, the stay‐green phenotype, and agronomic performance in barley and wheat grown in semi‐arid conditionsen_US
mus.citation.journaltitleThe Plant Phenome Journalen_US
mus.relation.collegeCollege of Agricultureen_US
mus.relation.departmentPlant Sciences & Plant Pathology.en_US
mus.relation.universityMontana State University - Bozemanen_US

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