Abstract

Two greenhouse experiments were carried out to analyze the shoot sodium(Na+) partitioning, yield, and fruit quality of 'Cuore di Bue', a salt-sensitive heirloomtomato (Solanum lycopersicum L.), ungrafted or grafted onto interspecific tomato hybridrootstocks (S. lycopersicum 3 S. habrochaites) 'Maxifort' and 'Arnold' in 2009, 'Arnold'and 'Armstrong' in 2010, grown at different salinity stress (SS) levels (0, 20, and 40mM ofNaCl in 2009; 0 and 20 mM of NaCl in 2010). In both experiments, an interaction wasobserved between grafting combinations and SS levels in terms of fruit yield, and fruitjuice Na+ content. Under no SS conditions, plant grafted onto 'Maxifort' and 'Armstrong'provided the highest yield in 2009 and 2010 experiments, respectively. In thepresence of 20 mM of NaCl, plants grafted onto 'Arnold' provided a marketable yield23.5% (on average) higher than plants grafted onto 'Maxifort' or ungrafted in 2009 and33% (on average) higher than plants grafted onto 'Armstrong' or ungrafted in 2010. Thefurther increase of SS to 40 mM of NaCl considerably reduced the productivity of allgrafting combinations. At 20 mM of NaCl, plants grafted onto 'Arnold' showed alsoa higher capacity to modulate shoot Na+ partitioning with respect to ungrafted plants byincreasing Na+ accumulation in older leaves (52%) and reducing Na+ content in youngerand most active leaves (24%), thus enabling the maintenance of higher K+/Na+, Ca2+/Na+,and Mg2+/Na+ ratios compared with ungrafted plants. Fruit total soluble solids content,titratable acidity, and dry matter were unaffected by grafting at any SS level, whereasunder SS, the fruit juice Na+ content of grafted plants was consistently lower (from 19%up to 68%) than that of ungrafted plants. Under moderate SS conditions (20mM of NaCl),the use of rootstock genotypes such as 'Arnold' having a particular ability to reduce Na+accumulation in younger and most active leaves may increase tomato yield and enhancetomato nutritional value by reducing the fruit juice Na+ content.

Autore Pugliese

• Serio Francesco

Tutti gli autori

• Di Gioia F.; Signore A.; Serio F.; Santamaria P.

Titolo volume/Rivista

HortScience

Anno di pubblicazione

2013

ISSN

0018-5345

ISBN

Non Disponibile

Numero di citazioni Wos

Nessuna citazione

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Numero di citazioni Scopus

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Settori ERC

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Codici ASJC

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