Show simple item record

Terminal drought tolerant pearl millet [Pennisetum glaucum (L.) R. Br.] have high leaf ABA and limit transpiration at high vapour pressure deficit

dc.contributor.authorKholová, Jana
dc.contributor.authorHash, C.T.
dc.contributor.authorKumar, P.L.
dc.contributor.authorYadav, R.S.
dc.contributor.authorKočová, M.
dc.contributor.authorVadez, Vincent
dc.date.accessioned2019-12-04T11:11:07Z
dc.date.available2019-12-04T11:11:07Z
dc.date.issued2010
dc.identifier.citationKholová, J., Hash, C.T., Kumar, P.L., Yadav, R.S., Kočová, M. & Vadez, V. (2010). Terminal drought-tolerant pearl millet [Pennisetum glaucum (L.) R. Br.] have high leaf ABA and limit transpiration at high vapour pressure deficit. Journal of Experimental Botany, 61(5), 1431-1440.
dc.identifier.issn0022-0957
dc.identifier.urihttps://hdl.handle.net/20.500.12478/2354
dc.description.abstractIt was previously shown that pearl millet genotypes carrying a terminal drought tolerance quantitative trait locus (QTL) had a lower transpiration rate (Tr; g cm−2 d−1) under well-watered conditions than sensitive lines. Here experiments were carried out to test whether this relates to leaf abscisic acid (ABA) and Tr concentration at high vapour pressure deficit (VPD), and whether that leads to transpiration efficiency (TE) differences. These traits were measured in tolerant/sensitive pearl millet genotypes, including near-isogenic lines introgressed with a terminal drought tolerance QTL (NIL-QTLs). Most genotypic differences were found under well-watered conditions. ABA levels under well-watered conditions were higher in tolerant genotypes, including NIL-QTLs, than in sensitive genotypes, and ABA did not increase under water stress. Well-watered Tr was lower in tolerant than in sensitive genotypes at all VPD levels. Except for one line, Tr slowed down in tolerant lines above a breakpoint at 1.40–1.90 kPa, with the slope decreasing >50%, whereas sensitive lines showed no change in that Tr response across the whole VPD range. It is concluded that two water-saving (avoidance) mechanisms may operate under well-watered conditions in tolerant pearl millet: (i) a low Tr even at low VPD conditions, which may relate to leaf ABA; and (ii) a sensitivity to higher VPD that further restricts Tr, which suggests the involvement of hydraulic signals. Both traits, which did not lead to TE differences, could contribute to absolute water saving seen in part due to dry weight increase differences. This water saved would become critical for grain filling and deserves consideration in the breeding of terminal drought-tolerant lines.
dc.description.sponsorshipDepartment for International Development, United Kingdom
dc.description.sponsorshipMinistry of Education, Youth and Sports, Czech Republic
dc.format.extent1431-1440
dc.language.isoen
dc.subjectAba
dc.subjectPearl Millet
dc.subjectDrought Stress
dc.subjectTranspiration
dc.subjectVapour Pressure
dc.subjectPennisetum Glaucum
dc.titleTerminal drought tolerant pearl millet [Pennisetum glaucum (L.) R. Br.] have high leaf ABA and limit transpiration at high vapour pressure deficit
dc.typeJournal Article
dc.description.versionPeer Review
cg.contributor.affiliationInternational Crops Research Institute for the Semi-Arid Tropics
cg.contributor.affiliationCharles University in Prague
cg.contributor.affiliationInternational Institute of Tropical Agriculture
cg.contributor.affiliationAberystwyth University
cg.isijournalISI Journal
cg.authorship.typesCGIAR and advanced research institute
cg.iitasubjectBiodiversity
cg.iitasubjectLand Use
cg.iitasubjectFood Security
cg.journalJournal of Experimental Botany
cg.howpublishedFormally Published
cg.accessibilitystatusLimited Access
local.dspaceid92263
cg.targetaudienceScientists
cg.identifier.doihttps://dx.doi.org/10.1093/jxb/erq013


Files in this item

FilesSizeFormatView

There are no files associated with this item.

This item appears in the following Collection(s)

Show simple item record