Diversity in root growth responses to moisture deficit in young faba bean (Vicia faba L.) plants

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dc.contributor.author Belachew, Kiflemariam Yehuala
dc.contributor.author Nagel, Kerstin
dc.contributor.author Fiorani, Fabio
dc.contributor.author Stoddard, Frederick Lothrop
dc.date.accessioned 2018-03-29T08:24:01Z
dc.date.available 2018-03-29T08:24:01Z
dc.date.issued 2018-02-21
dc.identifier.citation Belachew , K Y , Nagel , K , Fiorani , F & Stoddard , F L 2018 , ' Diversity in root growth responses to moisture deficit in young faba bean (Vicia faba L.) plants ' , PeerJ , vol. 6 , 4401 , pp. 1-20 . https://doi.org/10.7717/peerj.4401
dc.identifier.other PURE: 99358128
dc.identifier.other PURE UUID: e779f35c-10bf-4695-9f5e-54b155676230
dc.identifier.other WOS: 000426518200005
dc.identifier.other Scopus: 85042455668
dc.identifier.other ORCID: /0000-0002-8097-5750/work/43226679
dc.identifier.other ORCID: /0000-0002-5066-8602/work/66366998
dc.identifier.uri http://hdl.handle.net/10138/233829
dc.description.abstract Background Soil moisture deficiency causes yield reduction and instability in faba bean (Vicia faba L.) production. The extent of sensitivity to drought stress varies across accessions originating from diverse moisture regimes of the world. Hence, we conducted successive greenhouse experiments in pots and rhizotrons to explore diversity in root responses to soil water deficit. Methods A set of 89 accessions from wet and dry growing regions of the world was defined according to the Focused Identification of Germplasm Strategy and screened in a perlite-sand medium under well watered conditions in a greenhouse experiment. Stomatal conductance, canopy temperature, chlorophyll concentration, and root and shoot dry weights were recorded during the fifth week of growth. Eight accessions representing the range of responses were selected for further investigation. Starting five days after germination, they were subjected to a root phenotyping experiment using the automated phenotyping platform GROWSCREEN-Rhizo. The rhizotrons were filled with peat-soil under well watered and water limited conditions. Root architectural traits were recorded five, 12, and 19 days after the treatment (DAT) began. Results In the germplasm survey, accessions from dry regions showed significantly higher values of chlorophyll concentration, shoot and root dry weights than those from wet regions. Root and shoot dry weight as well as seed weight, and chlorophyll concentration were positively correlated with each other. Accession DS70622 combined higher values of root and shoot dry weight than the rest. The experiment in GROWSCREEN-Rhizo showed large differences in root response to water deficit. The accession by treatment interactions in taproot and second order lateral root lengths were significant at 12 and 19 DAT, and the taproot length was reduced up to 57% by drought. The longest and deepest root systems under both treatment conditions were recorded by DS70622 and DS11320, and total root length of DS70622 was three times longer than that of WS99501, the shortest rooted accession. The maximum horizontal distribution of a root system and root surface coverage were positively correlated with taproot and total root lengths and root system depth. DS70622 and WS99501 combined maximum and minimum values of these traits, respectively. Thus, roots of DS70622 and DS11320, from dry regions, showed drought-avoidance characteristics whereas those of WS99501 and Melodie/2, from wet regions, showed the opposite. Discussion The combination of the germplasm survey and use of GROWSCREEN-Rhizo allowed exploring of adaptive traits and detection of root phenotypic markers for potential drought avoidance. The greater root system depth and root surface coverage, exemplified by DS70622 and DS11320, can now be tested as new sources of drought tolerance. en
dc.format.extent 20
dc.language.iso eng
dc.relation.ispartof PeerJ
dc.rights cc_by
dc.rights.uri info:eu-repo/semantics/openAccess
dc.subject 414 Agricultural biotechnology
dc.subject Vicia faba L.
dc.subject faba bean
dc.subject Water limited
dc.subject Root width
dc.subject Drought screening
dc.subject GROWSCREEN RhizoBoxes
dc.subject Root depth
dc.subject Drought tolerance
dc.subject Root traits
dc.subject Automated phenotyping
dc.subject CICER-ARIETINUM L.
dc.subject DROUGHT TOLERANCE
dc.subject WATER-DEFICIT
dc.subject SEEDLING STAGE
dc.subject TRAITS
dc.subject CHICKPEA
dc.subject STRESS
dc.subject 4111 Agronomy
dc.title Diversity in root growth responses to moisture deficit in young faba bean (Vicia faba L.) plants en
dc.type Article
dc.contributor.organization Department of Agricultural Sciences
dc.contributor.organization Viikki Plant Science Centre (ViPS)
dc.contributor.organization Legume science
dc.contributor.organization Helsinki Institute of Sustainability Science (HELSUS)
dc.contributor.organization Plant Production Sciences
dc.contributor.organization Crop Science Research Group
dc.description.reviewstatus Peer reviewed
dc.relation.doi https://doi.org/10.7717/peerj.4401
dc.relation.issn 2167-8359
dc.rights.accesslevel openAccess
dc.type.version publishedVersion

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