Phytohormone profiling in relation to osmotic adjustment in NaCl-treated plants of the halophyte tomato wild relative species Solanum chilense comparatively to the cultivated glycophyte Solanum lycopersicum.
A holistic approach was used to investigate the hormonal profile in relation with osmotic adjustment under salinity in Solanum lycopersicum and its halophyte wild relative Solanum chilense. Plants were subjected to 125mM NaCl for 7days. Solanum chilense displayed a contrasting behaviour comparatively to S. lycopersicum, not only for mineral nutrition, but also regarding the modalities of osmotic adjustment and phytohormonal profiling. The extent of osmotic adjustment was higher in S. chilense than in S. lycopersicum. Ions K+and Na+were the major contributors of osmotic adjustment in S. chilense, accounting respectively for 47 and 60% of osmotic potential. In contrast the contributions of proline and soluble sugars remained marginal for the two species although salt-induced accumulation of proline was higher in S. lycopersicum than in S. chilense. Both species also differed for their hormonal status under salinity and concentrations of most hormonal compounds were higher in S. chilense than in S. lycopersicum. Interestingly, salicylic acid, ethylene and cytokinins were positively correlated with osmotic potential in S. chilense under salinity while these hormones were negatively correlated with osmotic adjustment in S. lycopersicum. Our results suggested that the capacity to use inorganic ions as osmotica may improve salt resistance in S.chilense and that phytohormones could be involved in this process.
Groupe de Recherche en Physiologie végétale (GRPV), Earth and Life Institute - Agronomy (ELI-A), Université catholique de Louvain, Louvain-la-Neuve, Belgium; Laboratoire d'Ecologie végétale, Faculté des Sciences, Université de Tunis El Manar, Tunisia.
Emna
E
Gharbi
Instituto de Investigaciones Agropecuarias (INIA - La Cruz), La Cruz, Chile.
Juan-Pablo
JP
Martínez
Laboratoire d'Ecologie végétale, Faculté des Sciences, Université de Tunis El Manar, Tunisia.
Hela
H
Benahmed
Groupe de Recherche en Physiologie végétale (GRPV), Earth and Life Institute - Agronomy (ELI-A), Université catholique de Louvain, Louvain-la-Neuve, Belgium.
Imène
I
Hichri
Institute of Experimental Botany, Academy of Sciences of the Czech Republic, Prague, Czechia.
Petre I
PI
Dobrev
Institute of Experimental Botany, Academy of Sciences of the Czech Republic, Prague, Czechia.
Václav
V
Motyka
Groupe de Recherche en Physiologie végétale (GRPV), Earth and Life Institute - Agronomy (ELI-A), Université catholique de Louvain, Louvain-la-Neuve, Belgium.
Muriel
M
Quinet
Groupe de Recherche en Physiologie végétale (GRPV), Earth and Life Institute - Agronomy (ELI-A), Université catholique de Louvain, Louvain-la-Neuve, Belgium. Electronic address: stanley.lutts@uclouvain.be.
Stanley
S
Lutts
D018551:Solanum lycopersicum / Q000737:chemistry / Q000502:physiology*; D009995:Osmosis; D010788:Photosynthesis / Q000187:drug effects; D010937:Plant Growth Regulators / Q000032:analysis* / Q000502:physiology; D018515:Plant Leaves / Q000737:chemistry / Q000502:physiology; D054046:Plant Stomata / Q000187:drug effects / Q000502:physiology; D018526:Plant Transpiration / Q000502:physiology; D055051:Salt-Tolerant Plants / Q000737:chemistry / Q000502:physiology*; D012965:Sodium Chloride / Q000494:pharmacology
D010937:Plant Growth Regulators; D012965:Sodium Chloride
Halophyte; Hormone; Osmotic adjustment; Salinity; Solanum chilense; Tomato