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Relative importance of osmotic‐stress and ion‐specific effects on ABA‐mediated inhibition of leaf expansion growth in Phaseolus vulgaris
Author(s) -
Montero E.,
Cabot C.,
Poschenrieder CH.,
Barcelo J.
Publication year - 1998
Publication title -
plant, cell and environment
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.646
H-Index - 200
eISSN - 1365-3040
pISSN - 0140-7791
DOI - 10.1046/j.1365-3040.1998.00249.x
Subject(s) - xylem , salinity , phaseolus , chemistry , osmotic pressure , horticulture , botany , biology , ecology
Abbreviations: The osmotic and ion‐specific components of salt‐induced inhibition of leaf expansion growth were investigated in beans grown from 12 h to several days in either NaCl‐containing solution cultures, an isosmotic concentrated macronutrient solution, or a vermiculite–compost mixture with low Na + but high Cl – availability. Inhibition of leaf expansion and leaf ABA increase was more intense in the NaCl than in the isosmotic macronutrient treatment. Root Na + was highly correlated to inhibition of leaf expansion and leaf or xylem sap ABA. When Na + was sequestered in soil, salinized plants showed no reduction in leaf expansion or ABA increase, regardless of the presence of high leaf Cl – concentrations. Stomatal conductance exhibited an exponential relationship with the reciprocal value of xylem sap ABA. Our results indicate that an ion‐specific effect caused by Na + in roots may account for an ABA‐mediated reponse of both stomatal closure and leaf expansion inhibition.