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Limited effects of shade on physiological performances of cocoa (Theobroma cacao L.) under elevated temperature

dc.contributor.authorMensah, E.O.
dc.contributor.authorAsare, R.
dc.contributor.authorVaast, P.
dc.contributor.authorAmoatey, C.
dc.contributor.authorMarkussen, B.O.
dc.contributor.authorOwusu, K.
dc.contributor.authorAsitoakor, B.K.
dc.contributor.authorRaebild, A.
dc.date.accessioned2022-08-10T11:17:57Z
dc.date.available2022-08-10T11:17:57Z
dc.date.issued2022
dc.identifier.citationMensah, E.O., Asare, R., Vaast, P., Amoatey, C., Markussen, B.O., Owusu, K., ... & Ræbild, A. (2022). Limited effects of shade on physiological performances of cocoa (Theobroma cacao L.) under elevated temperature. Environmental and Experimental Botany: 201: 104983, 1-11.
dc.identifier.issn0098-8472
dc.identifier.urihttps://hdl.handle.net/20.500.12478/7628
dc.description.abstractShade is one of the recommended management solutions to mitigate the effects of heat stress, which is a major challenge for cocoa production globally. Nevertheless, there are limited studies to verify this hypothesis. Here, we evaluate the effects of heat and shade on cocoa physiology using experimental plots with six-month old potted seedlings in a randomized complete block design. Infrared heaters were applied for one month to increase leaf temperatures by an average of 5–7 ºC (heat treatment) compared with no heat (unheated treatments), and shaded plants were placed under a shade net removing 60% of the light compared with no shade (sun treatments). Plants under heat treatments in sun and in shade showed severe reduction in photosynthesis. Measurements of chlorophyll fluorescence and photosynthetic light response curves indicated that heat caused damages at photosystem II and additionally resulted in lower rates of maximal photosynthesis. Temperature optima for photosynthesis were at 31–33 ºC with only small differences between treatments, and as light saturation was reached at low PAR levels of 325 – 380 µmol m−2 s−1 in shade and 427 – 521 µmol m−2 s−1 in sun, ambient rates of photosynthesis were comparable between sun and shade treatments. Heat treatments resulted in decreased concentrations of chlorophyll and changed pigment composition, reduced specific leaf areas, and plant biomass. While shade may benefit cocoa seedlings, our results indicate that the positive effects may not be sufficient to counteract the negative effects of increased temperatures on cocoa physiology.
dc.description.sponsorshipMinistry of Foreign Affairs of Denmark
dc.format.extent1-11
dc.language.isoen
dc.subjectCocoa
dc.subjectTheobroma Cacao
dc.subjectClimate
dc.subjectPhotosynthesis
dc.titleLimited effects of shade on physiological performances of cocoa (Theobroma cacao L.) under elevated temperature
dc.typeJournal Article
cg.contributor.affiliationUniversity of Ghana
cg.contributor.affiliationUniversity of Copenhagen
cg.contributor.affiliationInternational Institute of Tropical Agriculture
cg.contributor.affiliationUniversité de Montpellier
cg.coverage.regionAfrica
cg.coverage.regionWest Africa
cg.coverage.countryGhana
cg.coverage.hubHeadquarters and Western Africa Hub
cg.researchthemeNatural Resource Management
cg.identifier.bibtexciteidMENSAH:2022
cg.isijournalISI Journal
cg.authorship.typesCGIAR and developing country institute
cg.iitasubjectAgronomy
cg.iitasubjectCocoa
cg.iitasubjectPlant Health
cg.journalEnvironmental and Experimental Botany
cg.notesOpen Access Article; Published online: 08 Jul 2022
cg.accessibilitystatusOpen Access
cg.reviewstatusPeer Review
cg.usagerightslicenseCreative Commons Attribution 4.0 (CC BY 0.0)
cg.targetaudienceScientists
cg.identifier.doihttps://dx.doi.org/10.1016/j.envexpbot.2022.104983
cg.iitaauthor.identifierRichard Asare: 0000-0001-6798-7821
cg.futureupdate.requiredNo
cg.identifier.issue104983
cg.identifier.volume201


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