首页|Varietal differences in salinity tolerance ami mineral nutrition in tomatoes (Lycopersicon esculentum Mill.)
Varietal differences in salinity tolerance ami mineral nutrition in tomatoes (Lycopersicon esculentum Mill.)
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NETL
Growth and mineral nutrition were investigated in seedlings of two varieties of commercial tomato (Lycopersicon esculentum Mill。) Marmande VR (Vilmorin， France) and Amico (Northerns Zaden， Holland)， in nutrient solutions containing 0 to 100 mM NaCl。 After 10 days of exposure to salt， Amico differed from Marmande by a higher salt tolerance of the growth of roots and shoots。 However， the shoot growth reduction in Marmande was accompanied by a root growth stimulation。 Thus， the shoot/root ratio was less modifed by NaCl in Amico than in Marmande。 Salinity decreased K~+， Ca~(2+) and Mg~(2+) uptake and translocation to shoots in both varieties， but this effect was lower in Amico than in Marmande。 Na~+ uptake and transport were slightly higher in Amico than in Marmande， but Cl~- uptake and transport were much lower。 The concentration of anions (A~-) other than Cl~- was estimated in leaves by substracting Cl~- from the sum of cations including Na~+。 The leaf content in A~- was higher in Amico， due to the lower concentration of Cl~-。 Since the A~- pool is partly constituted of anions necessary for leaf growth and functioning， the deficit in A~- observed in Marmande leaves could be related to the relative sensitivity of this variety to NaCl。 These results suggest that the higher salt tolerance of Amico is associated with its capacity to maintain a low concentration of Cl~- in the shoots and to reduce the inhibitory effect of salt on uptake and shoot transport of cations and anions necessary for growth。 The "anion deficit" could be used as an early screening parameter for salt tolerance in tomato plants。
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