Root length is proxy for high-throughput screening of waterlogging tolerance in Urochloa spp. grasses

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dc.creatorJiménez, Juan de la Cruz
dc.creatorCardoso, Juan Andrés
dc.creatorKotula, Lukasz
dc.creatorVeneklaas, Erik Jan
dc.creatorPedersen, Ole
dc.creatorColmer, Timothy D.
dc.date2021
dc.date2021-02-12T12:07:27Z
dc.date2021-02-12T12:07:27Z
dc.date.accessioned2026-06-27T13:26:49Z
dc.descriptionC4 perennial Urochloa spp. grasses are widely planted in extensive areas in the tropics. These areas are continuously facing waterlogging events, which limits plant growth and production. However, no commercial cultivar combining excellent waterlogging tolerance with superior biomass production and nutritional quality is available. The objective of this study was to identify root traits that can be used for selecting waterlogging tolerant species of Urochloa. Root respiration, root morphological, architectural and anatomical traits were evaluated in eight contrasting Urochloa spp. genotypes grown under aerated or deoxygenated stagnant solutions. Moreover, modelling of internal aeration was used to relate differences in root traits and root growth in waterlogged soils. Increased aerenchyma formation in roots, reduced stele area and development of a fully suberised exodermis are characteristics improving internal aeration of roots and therefore determining waterlogging tolerance in these C4 forage grasses. Waterlogging-tolerant genotypes had steeper root angles and greater root lengths than the waterlogging-sensitive genotypes. In stagnant conditions, waterlogging-tolerant genotypes had a greater proportion of aerenchyma and reduced stele area in root cross-sections, had deeper roots, steeper root angle and larger root biomass, which in turn, allowed for greater shoot biomass. Total root length had the strongest positive influence on shoot dry mass and can therefore be used as proxy for selecting waterlogging tolerant Urochloa genotypes.
dc.formatapplication/pdf
dc.identifierhttps://hdl.handle.net/10568/111275
dc.identifier.urihttp://hdl.handle.net/123456789/59655
dc.languageen
dc.publisherCommonwealth Scientific and Industrial Research Organisation
dc.rightsOpen Access
dc.sourcede la Cruz Jiménez, J.; Cardoso, J.A.; Kotula, L.; Veneklaas, E.J.; Pedersen, O.; Colmer, T.D. (2020) Root length is proxy for high-throughput screening of waterlogging tolerance in Urochloa spp. grasses. Functional Plant Biology, Online first paper (8 December 2020). ISSN: 1445-4416
dc.subjectabiotic stress
dc.subjectlignins
dc.subjectroot length
dc.subjectbiopolymers
dc.subjectwaterlogging
dc.subjectestrés abiótico
dc.subjectligninas
dc.subjectbiopolímeros
dc.titleRoot length is proxy for high-throughput screening of waterlogging tolerance in Urochloa spp. grasses
dc.typeJournal Article

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