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Rootstock-mediated changes in xylem ionic and hormonal status are correlated with delayed leaf senescence, and increased leaf area and crop productivity in salinized tomato

AuthorsAlbacete, Alfonso ; Martínez-Andújar, Cristina ; Ghanem, M. E. ; Acosta, Manuel; Sánchez-Bravo, J.; Asins, M. J.; Cuartero, Jesús; Lutts, S.; Dodd, Ian C.; Pérez-Alfocea, Francisco
Keywordstomato (Solanum lycopersicum L.)
Abscisic acid (ABA) (ABA)
1-aminocyclopropane-1-carboxylic acid
principal component analysis
salt stress
zeatin riboside
Issue DateJul-2009
PublisherBlackwell Publishing
CitationPlant, Cell and Environment (2009) 32, 928–938
AbstractTomato crop productivity under salinity can be improved by grafting cultivars onto salt-tolerant wild relatives, thus mediating the supply of root-derived ionic and hormonal factors that regulate leaf area and senescence.Atomato cultivar was grafted onto rootstocks from a population of recombinant inbred lines (RILs) derived from a Solanum lycopersicum ¥ Solanum cheesmaniae cross and cultivated under moderate salinity (75 mMNaCl).Concentrations ofNa+,K+ and several phytohormones [abscisic acid (ABA); the cytokinins (CKs) zeatin, Z; zeatin riboside, ZR; and the ethylene precursor 1-aminocyclopropane-1-carboxylic acid (ACC)]were analysed in leaf xylem sap in graft combinations of contrasting vigour. Scion leaf area correlated with photosystem II (PSII) efficiency (Fv/Fm) and determined fruit productivity. Xylem K+ (but not Na+), K+/Na+, the active CK Z, the ratio with its storage formZ/ZRand especially the ratio betweenCKsand ACC(Z/ACCandZ + ZR/ACC)were positively loaded into the first principal component (PC) determining both leaf growth and PSII efficiency. In contrast, the ratioACC/ABA was negatively correlated with leaf biomass. Although the underlying physiological mechanisms by which rootstocks mediate leaf area or chlorophyll fluorescence (and thus influence tomato salt tolerance) seem complex, a putative potassium–CK interaction involved in regulating both processes merits further attention.
Publisher version (URL)http://dx.doi.org/10.1111/j.1365-3040.2009.01973.x
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