Abstract
Proline (Pro) accumulation in leaf discs of the NaCl-treated salt sensitive Lycopersicon esculentum was higher than in the salt tolerant L. pennellii. The magnitude of Pro accumulation differed when leaf discs of both species were floated in the light or under darkness, and in various incubation media: buffer solutions (pH from 3.9 to 7.8), abscisic acid, isobutyric acid, NH4Cl, malate, citrate, and mixtures of NaCl and KCl, NaCl and CaCl2, and NaCl and mannitol. Under darkness, Pro accumulation in L. esculentum was not regulated by salts. Conversely, the light-independent NaCl-induced Pro accumulation observed in L. pennellii became light-dependent when CaCl2 was added. The different expression patterns of Pro accumulation reinforce the proposal of two Pro metabolic pathways in the domestic and the wild tomatoes.
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