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De part ment of Plant Phys i ol ogy, Au gust Cieszkowski Ag ri cul tural Uni ver sity,The ef fect of a mod er ate (PEG -0.75 MPa) and se vere (PEG -1.5 MPa) wa ter def i cit on SA con tent in leaves and roots as well as the ef fect of pre-treat ment with SA on re ac tion to wa ter stress were eval u ated in two bar ley ge no types -the mod ern cv. Maresi and a wild form of Hordeum spontaneum.

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Seedlings of two barley genotypes ('Maresi' and wild form ofHordeum spontaneum) were treated with jasmonic acid (JA 5 laM and 15 laM) for 24 h, and then subjected to water stress (PEG 6000 solution of-1.5 MPa). JA caused an increase in the content of ABA but not in that of proline and spermidine in the two studied genotypes. The effect of the treatment did not depend on the applied JA concentration. The pre-stress treatment with JA changed plant response to water deficit with regard to membrane injury. Treatment with a lower JA concentration (5 laM) caused a substantial reduction of the stress-induced membrane damage in the both genotypes. A higher JA concentration (15 laM) caused the reduction of membrane injury only in H. spontaneum and was ineffective in 'Maresi'. JA had no influence on the leaf water status in water-stressed plants. A possible role of JA in leaf ABA accumulation and alleviation of cell membrane injury under water deficit is discussed.