Osmotic adjustment, proline accumulation and cell membrane stability in leaves of Cocos nucifera submitted to drought stress

dc.creatorOliva, Marco A.
dc.creatorAquino, Leonardo A.
dc.creatorGomes, Fabio P.
dc.creatorMielke, Marcelo S.
dc.creatorAlmeida, Alex-Alan F.
dc.date2019-02-22T13:12:25Z
dc.date2019-02-22T13:12:25Z
dc.date2010-09-30
dc.date.accessioned2023-09-27T21:08:03Z
dc.date.available2023-09-27T21:08:03Z
dc.identifier0304-4238
dc.identifierhttps://doi.org/10.1016/j.scienta.2010.07.036
dc.identifierhttp://www.locus.ufv.br/handle/123456789/23665
dc.identifier.urihttps://repositorioslatinoamericanos.uchile.cl/handle/2250/8955206
dc.descriptionThe role of drought-induced proline accumulation in coconut leaves is still unclear. With the objective of evaluating the impact of water shortage on leaf osmotic potential, proline accumulation and cell membrane stability in young plants of two Brazilian Green Dwarf coconut ecotypes from contrasting areas (Brazilian Green Dwarf from Una, Bahia, UGD, and from Jiqui, Rio Grande do Norte, JGD), a pot experiment was conducted under greenhouse conditions. Three drought cycles consisting of suspension of irrigation until the net photosynthetic rate (A) approached zero and rewatering until recovery of A to 85% of the irrigated control plants. Pre-dawn leaf water potential (ΨPD) reached −1.2 MPa at the point of maximum stress (PMS). Dry matter production and leaf area were severely reduced by drought treatment in the two ecotypes. Corrected values of osmotic potential were significantly reduced in stressed plants of the two ecotypes. Green dwarf coconut palm showed low osmotic adjustment (from 0.05 to 0.24 MPa) and significant accumulation of proline (from 1.5 to 2.1 times in relation to control) in leaflets in response to water deficit. Considering the growth reduction observed in both ecotypes, proline was not associated to osmoregulation. On the other hand, the absence of membrane damage, as indicated by electrolyte leakage method, suggests that the protective role of proline in this specie can be more important. The two ecotypes of Green dwarf coconut palm behaved similarly in the present experiment for most traits evaluated. Slight differences among the ecotypes were observed with respect to the response to treatments, such as higher proline accumulation in JGD.
dc.formatpdf
dc.formatapplication/pdf
dc.languageeng
dc.publisherScientia Horticulturae
dc.relationVolume 126, Issue 3, Pages 379- 384, September 2010
dc.rights2010 Published by Elsevier B.V. All rights reserved.
dc.subjectBiomass
dc.subjectCoconut
dc.subjectDrought sensitivity
dc.subjectElectrolyte leakage
dc.subjectOsmotic potential
dc.titleOsmotic adjustment, proline accumulation and cell membrane stability in leaves of Cocos nucifera submitted to drought stress
dc.typeArtigo


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