期刊
BIOLOGIA
卷 67, 期 4, 页码 689-697出版社
SPRINGER
DOI: 10.2478/s11756-012-0052-7
关键词
Prosopis strombulifera; halophytes; jasmonates; polyamines; NaCl; Na2SO4
类别
资金
- CONICET PIP [5628]
- PICTO-ANPCYT-UNRC [30093]
- SECYT-Universidad Nacional de Rio Cuarto
- Ministerio de Ciencia y Tecnologia de la Provincia de Cordoba, Argentina [1210/2007-2011]
- CONICET
Prosopis strombulifera, a common legume in high-salinity soils of Argentina, is a useful model for elucidation of salt tolerance mechanisms and specific biochemical pathways in halophytes, since its NaCl tolerance exceeds the limit described for most halophytic plants. We analyzed the effects of the increasing concentration of two main soil salts, Na2SO4 and NaCl, on growth parameters of P. strombulifera, chlorophyll levels, and content of jasmonates (JAs) and polyamines (PAs), which are key molecules involved in stress responses. P. strombulifera showed a halophytic response (growth promotion) to NaCl, but strong growth inhibition by iso-osmotic solutions of Na2SO4. Chlorophyll levels, number of leaves and leaf area were also differentially affected. An important finding was the partial alleviation of SO (4) (2-) toxicity by treatment with two-salt mixture. JAs are not directly involved in salt tolerance in this species since its levels decrease under all salt treatments. Beneficial effects of Putrescine (Put) accumulation in NaCl treated plants maybe inferred probably associated with the antioxidative defense system. Another novel finding is the accumulation of the uncommon PA cadaverine in roots under high Na2SO4, which may be related to SO (4) (2-) toxicity.
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