Interactive effects of boron and NaCl stress on water and nutrient transport in two broccoli cultivars

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Title: Interactive effects of boron and NaCl stress on water and nutrient transport in two broccoli cultivars
Authors: Rodríguez Hernández, María del Carmen | Moreno, Diego A. | Carvajal, Micaela | Martínez Ballesta, M. Carmen
Research Group/s: Fisiología Vegetal Aplicada
Center, Department or Service: Universidad de Alicante. Departamento de Ciencias de la Tierra y del Medio Ambiente
Keywords: Hydraulic conductivity | Mineral analysis | Phenolic compounds | Plasma membrane proteins | Salinity
Knowledge Area: Fisiología Vegetal
Issue Date: 24-Apr-2013
Publisher: CSIRO Publishing
Citation: Functional Plant Biology. 2013, 40(7): 739-748. doi:10.1071/FP12314
Abstract: In arid regions, the water from aquifers usually contains high NaCl levels, and alternative water sources, such as desalination plants, produce boron accumulation and have an adverse effect on crops. We studied the water transport and membrane integrity of two broccoli (Brassica oleracea L.) cultivars (Naxos and Viola) in the response to two boric acid levels, (1.8 mg L–1 and 4.3 mg L–1), alone or in combination with salinity (0 or 80 mM), and the involvement of plasma membrane intrinsic protein (PIP) aquaporins in this response. Nutritional status was also evaluated, as it affects the structural and functional integrity of the membranes. Since B is partly responsible for changes in the concentration and metabolism of phenolic compounds in vascular plants, these compounds were determined. In Naxos, the effect of 1.8 mg L–1 B concentration on the plasma membrane influenced plant salinity tolerance through the associated changes in the root hydraulic conductivity and the recovery of biomass production with regard to the NaCl treatment. By contrast, in Viola, a different PIP abundance pattern was observed indicating that the threshold B concentration differs between Viola and Naxos, resulting in higher sensitivity. In fact, a decreased transpiration and photosynthetic rate observed in Viola after the addition of 4.3 mg L–1 boric acid highlighted the highest sensitivity to boron, although this level had no adverse effect on the plasma membrane. The results suggest that B and NaCl trigger a hydric response involving aquaporins, together with changes in nutrient transport and plasma membrane stability.
Sponsor: This work was funded by the Seneca Foundation – Regional Agency for Science and Technology of the Autonomous Community of the Murcia Region (CARM; Project Ref. 08753/PI/08, Excellence in research 04486/GERM/06).
ISSN: 1445-4408 (Print) | 1445-4416 (Online)
DOI: 10.1071/FP12314
Language: eng
Type: info:eu-repo/semantics/article
Rights: © CSIRO 2013
Peer Review: si
Publisher version:
Appears in Collections:INV - FVA - Artículos de Revistas

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