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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
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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
Tomato 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. A tomato cultivar was grafted onto rootstocks from a population of recombinant inbred lines (RILs) derived from a Solanum lycopersicum x Solanum cheesmaniae cross and cultivated under moderate salinity (75 mm NaCl). Concentrations of Na+, 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 (F-v/F-m) and determined fruit productivity. Xylem K+ (but not Na+), K+/Na+, the active CK Z, the ratio with its storage form Z/ZR and especially the ratio between CKs and ACC (Z/ACC and Z + ZR/ACC) were positively loaded into the first principal component (PC) determining both leaf growth and PSII efficiency. In contrast, the ratio ACC/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.
Munns, Annual Review of Plant Biology, 59, 651 (2008)
Parra, Environmental and Experimental Botany, 60, 77 (2007)
Alfocea Francisco Pérez, Balibrea María E., Alarcón Juan J., Bolarín María C., Composition of Xylem and Phloem Exudates in Relation to the Salt-tolerance of Domestic and Wild Tomato Species, 10.1016/s0176-1617(00)80075-9
Rush, Journal of American Society for Horticultural Science, 106, 699 (1981)
Sacher R. F., Staples R. C., Robinson R. W., Saline Tolerance in Hybrids of Lycopersicon Esculentum X Solanum Penellii and Selected Breeeding Lines, Biosaline Research (1982) ISBN:9781489950000 p.325-336, 10.1007/978-1-4899-4998-1_27
Saranga, Theoretical and Applied Genetics, 84, 390 (1992)
Sharp, Journal of Experimental Botany, 51, 1575 (2000)
Tal, Australian Journal of Agricultural Research, 22, 631 (1971)
Villalta, Theoretical and Applied Genetics, 114, 1001 (2007)
Villalta, Theoretical and Applied Genetics, 116, 869 (2008)
Werner, Journal of Experimental Botany, 59, 2659 (2008)
Werner, Proceedings of the National Academy of Sciences of the United States of America, 98, 10487 (2001)
Yeo, Plant Solute Transport, 340 (2007)
Zhang, Nature Biotechnology, 19, 765 (2001)
Bibliographic reference
Albacete, Alfonso ; Martinez-Andujar, Cristina ; Ghanem, Michel Edmond ; Acosta, Manuel ; Sanchez-Bravo, Jose ; et. al. 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. In: Plant, Cell and Environment, Vol. 32, no. 7, p. 928-938 (2009)