INTERACTION BETWEEN SALINITY AND PHYTOPHTHORA CITROPHTHORA IN PISTACHIO SEEDLINGS UNDER HYDROPONIC SYSTEM

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BANIHASHEMI Z.A.D.; TABATABAEE S.A.R.

مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

Journal Paper

Paper Information

Journal: IRANIAN JOURNAL OF PLANT PATHOLOGY Year:2004 | Volume:40 | Issue:3-4 Page(s): 159-178

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Information Journal Paper

Title

INTERACTION BETWEEN SALINITY AND PHYTOPHTHORA CITROPHTHORA IN PISTACHIO SEEDLINGS UNDER HYDROPONIC SYSTEM

Author(s)

BANIHASHEMI Z.A.D. | TABATABAEE S.A.R. | Issue Writer Certificate

Keywords

PHYTOPHTHORA CITROPHTHORAQ4

SALINITYQ2

OISTACIA VERAQ3

P. NICOTIANAEQ4

GUMMOSISQ4

Abstract

Since Pistacia vera cultivars are salt tolerant plants and grown mostly in saline soils in Iran where phytophthora GUMMOSIS is also a problem, the effects of SALINITY and Phytophthora root and crown rot of pistachio was investigated under controlled conditions. The experiment was carried out in hydroponic system using salt and disease sensitive (cv. Fandoughi) and salt and disease tolerant (cv. Badami) pistachio seedlings. Plants were exposed to salt stress over a period of seven days to 1.2, 2.4 and 3.6 mg NaCl/ml and inoculated with 200 zoospores/ml of Phytophthora before or after salt stress. Root colonization, length and dry weight were measured at the end of the experiment. Salt stress was also assessed on the pathogen growth (0-30mgNaCl/ml) sporulation (0-12 mg NaCl/ml) and release of zoospores (0-3 mg NaCl/ml) using P. citrophthora and P.nicotianae. Although salt stress increased root colonization in salt sensitive compared to salt tolerant pistachio cultivar, the differences were not significant. Root length and dry weight in salt stressed inoculated plants was significantly reduced only in salt sensitive plants. Increasing SALINITY had significant effects on growth in both species of Phytophthora. Differences between the two species were noticed at 1mg or higher NaCl/ml. P.nicottanae was more sensitive to SALINITY than P.citrophthora. There was an increase in growth of P.citrophthora at 14mg NaCl/ml but a decrease there after. At 4 mg NaCl/ml, sporangial formation was induced in P.citrophthora from saline soil but reduced in P.nicotianae in saline soil and P.citrophthora from non-saline citrus soil.Indirect germination of sporangia increased up to 1 and 2 mg NaCl/ml respectively in P.nicotianae and P.citrophthora. (Both from saline soils) but decreased at higher concentrations.

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