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Lipid Composition of Citrus Leaves from Plants Resistant and Susceptible to Citrus Bacterial Canker
Author(s) -
Jiao H. J.,
Wang S. Y.,
Civerolo E. L.
Publication year - 1992
Publication title -
journal of phytopathology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.53
H-Index - 60
eISSN - 1439-0434
pISSN - 0931-1785
DOI - 10.1111/j.1439-0434.1992.tb01249.x
Subject(s) - biology , degree of unsaturation , citrus paradisi , composition (language) , botany , phosphatidylethanolamine , citrus canker , phospholipid , phosphatidylglycerol , linolenic acid , campesterol , palmitic acid , xanthomonas campestris , fatty acid , linoleic acid , biochemistry , rutaceae , sterol , bacteria , cholesterol , chemistry , linguistics , philosophy , genetics , organic chemistry , membrane , phosphatidylcholine , gene
The contents and composition of lipids in citrus leaves in relation to their general resistance to infection by strains of Xanthomonas campestris pv. citri (Xcc) were determined. The composition and contents of total polar lipids and phospholipids and the degree of fatty acid unsaturation were significantly different between resistant and susceptible species. Leaves from resistant plants had less phospholipids, but more free sterols than those from susceptible plants. The predominant fatty acids in the phospholipids were palmitic (16:0), linoleic (18:2) and α‐linolenic acid (18:3). The degree of fatty acid unsaturation was higher in susceptible plants than in resistant plants. Major phospholipids in citrus leaves were phosphatidylchloline (PC), phosphatidylethanolamine (PE), phosphatidylglycerol (PG), and phosphatidylinositol (PI). β‐Sitosterol, campesterol and lanosterol were major sterols in the leaves of citrus plants with resistant species having a higher ratio of free sterols to total phospholipids than susceptible species. Differences in lipid metabolism may contribute to differences in Xcc‐resistance of citrus leaves.