dc.creatorDias, Paulo C.
dc.creatorAraujo, Wagner L.
dc.creatorMoraes, Gustavo A.B.K.
dc.creatorBarros, Raimundo S.
dc.creatorDaMatta, Fábio M.
dc.date2018-04-25T17:15:22Z
dc.date2018-04-25T17:15:22Z
dc.date2006-12-19
dc.date.accessioned2023-09-27T20:47:21Z
dc.date.available2023-09-27T20:47:21Z
dc.identifier01761617
dc.identifierhttps://doi.org/10.1016/j.jplph.2006.12.004
dc.identifierhttp://www.locus.ufv.br/handle/123456789/19133
dc.identifier.urihttps://repositorioslatinoamericanos.uchile.cl/handle/2250/8947929
dc.descriptionDrought is a major environmental constraint affecting growth and production of coffee. The effects of water supply on growth, biomass allocation, water relations, and gas exchange in two coffee progenies representing drought-tolerant (Siriema) and drought-sensitive (Catucaí) genotypes were compared. They were grown in 12-L pots until 4-months old, when they were submitted to two watering treatments for 60 d: plants receiving either 100% transpired water (control plants) or a fraction (about 40%) of the amount of water transpired by control plants (drought-stressed plants). Under control conditions, Siriema grew faster than Catucaí. Regardless of the watering regimes and progenies, relative growth rate (RGR) was positively correlated both with net assimilation rate (NAR) and long-term water-use efficiency (WUE), but not with differences in biomass allocation. Both progenies responded to drought stress through (i) similar decreases in both RGR and NAR with marginal, if any, changes in allocation; (ii) decreases in leaf water potential, which occurred to a greater extent in Catucaí than in Siriema, even though they have showed similar abilities to adjust osmotically and elastically; (iii) similar reductions in net photosynthesis due mainly to nonstomatal factors; and (iv) decreases in transpiration rate coupled with increased long-term WUE. However, the lower transpiration rate and the higher long-term WUE as found in Siriema relative to Catucaí under control conditions persisted under drought conditions. Overall, the major differences between these progenies were largely associated with differences in plant water use, which was likely related to the improved water status of Siriema. The possible implications of selecting coffee genotypes for high WUE are discussed.
dc.formatTexto Virtual
dc.formatapplication/pdf
dc.languageeng
dc.publisherJournal of Plant Physiology
dc.relationv. 164, Issue 12, p. 1639-1647, december 2007
dc.rightsElsevier GmbH.
dc.subjectCoffea
dc.subjectDrought stress
dc.subjectGrowth
dc.subjectTranspiration
dc.subjectWater-use efficiency
dc.titleMorphological and physiological responses of two coffee progenies to soil water availability
dc.typeArtigo


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