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Defense responses to Fusarium oxysporum f. sp. ricini infection in castor (Ricinus communis L.) cultivars

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Title Defense responses to Fusarium oxysporum f. sp. ricini infection in castor (Ricinus communis L.) cultivars
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Creator E. Bharathi
M. Santha Lakshmi Prasad
Praduman Yadav
Hameeda Bee
 
Subject Castor · Wilt · Histopathology · Antioxidant enzymes · Resistance mechanism
 
Description Not Available
The biophysical and biochemical basis of resistance in castor to wilt caused by Fusarium oxysporum f. sp. ricini was studied. Entry and colonization of fungal mycelium in susceptible (JI-35) and resistant (48-1) cultivars was studied histopathologically by employing bright feld, scanning and transmission electron microscopy. Browning of xylem vessels of vascular bundles in susceptible cultivar can be taken as an anatomical parameter for early detection of the wilt disease. Electron microscopy revealed more mycelium and spores in the susceptible cultivar. Cell wall was thick in resistant cultivar than the susceptible cultivar. Biochemical activity of antioxidant enzymes and pathogenesis related (PR) proteins in the roots of resistant and susceptible genotypes of castor were studied at 24, 48, 72 and 96 h after inoculation till 7 days. Studies pertaining to the activity of defense enzymes viz, superoxide dismutase (SOD), peroxidase (POX), catalase (CAT), ascorbate peroxidase
(APX), glutathione reductase (GR) and β-1,3-glucanase revealed that the level of defense related enzyme activity of SOD, GR and β-1,3-glucanase was higher in resistant cultivar. However, the activity of CAT reached a maximum at 4 days post inoculation and decreased by 7 days. In contrast, the activity of APX enzyme was higher in susceptible cultivar. Release of these enzymes related to expression of resistant mechanism restricted the browning of xylem vessels in resistant cultivar. The restricted growth of mycelium, absence of browning in xylem vessels and increase in activity of defense related enzymes in resistant cultivar indicates the resistance mechanism in the plant.
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Date 2020-12-17T09:14:36Z
2020-12-17T09:14:36Z
2019-02-11
 
Type Research Paper
 
Identifier Not Available
Not Available
http://krishi.icar.gov.in/jspui/handle/123456789/43509
 
Language English
 
Relation Not Available;
 
Publisher Indian Phytopathological Society