Cytological responses in the hypersensitive reaction in cotyledon and stem tissues of Brassica napus after infection by Leptosphaeria maculans |
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| Authors: | Hua Li Krishnapillai Sivasithamparam Martin J. Barbetti Stephen J. Wylie John Kuo |
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| Affiliation: | (1) School of Earth and Geographical Sciences, Faculty of Natural and Agricultural Sciences, The University of Western Australia, Nedlands, WA, 6009, Australia;(2) School of Plant Biology, Faculty of Natural and Agricultural Sciences, The University of Western Australia, Nedlands, WA, 6009, Australia;(3) Western Australian State Agricultural Biotechnology Centre, Murdoch University, Murdoch, WA, 6150, Australia;(4) The Centre for Microscopy and Microanalysis, The University of Western Australia, Nedlands, WA, 6009, Australia |
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| Abstract: | A hypersensitive response (HR) occurs after infection of cotyledon, leaf and stem of Brassica napus cv. Surpass 400 by an avirulent strain of Leptosphaeria maculans. The cotyledon or the sixth true-leaf stages of plants were inoculated with pycnidiospores of L. maculans (strain UWA P11). For the first time in this specific pathosystem and its HR, we report condensation of cytoplasm, shrinkage in cell size and nuclear DNA fragmentation in cotyledon tissues, and in stem tissues, shrinkage and condensation of the cytoplasm, chromatin fragmentation and lobing of the nucleus. |
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| Keywords: | Leptosphaeria maculans Brassica napus Brassica rapa Hypersensitive response Cytological responses |
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