Infection and Some Aspects of Resistance Mechanism of Capsicum Annuum to Ralstonia Solanacearum

Bacterial wilt of chilli (Capsicum annuum L.) caused by Ralstonia solanacearum is a major constraint to the production of the crop in Malaysia. To-date very few resistant germplasm of chilli to the pathogen is known. Information on the mechanism of infection and resistance, and multiplication of...

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Main Author:	Abdul Rahman, Muhammed
Format:	Thesis
Language:	English English
Published:	1997
Subjects:	Plant infection Plant diseases Capsicum annuum - Disease and pest resistance
Online Access:	http://psasir.upm.edu.my/id/eprint/10405/1/FP_1997_14_A.pdf
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id	my-upm-ir.10405
record_format	uketd_dc
spelling	my-upm-ir.104052011-04-08T02:22:04Z Infection and Some Aspects of Resistance Mechanism of Capsicum Annuum to Ralstonia Solanacearum 1997 Abdul Rahman, Muhammed Bacterial wilt of chilli (Capsicum annuum L.) caused by Ralstonia solanacearum is a major constraint to the production of the crop in Malaysia. To-date very few resistant germplasm of chilli to the pathogen is known. Information on the mechanism of infection and resistance, and multiplication of the pathogen in chilli are lacking. There is also no information on the anatomical characters of the hosts which might be related to resistance. The present study was, therefore, undertaken to obtain this information which would provide an understanding of the disease. It could be useful in formulating wilt-resistance breeding programme in chilli and an effective control measures for the disease. Greenhouse evaluation of the susceptibility of accessions/cultivars of Capsicum spp. to R. solanacearum revealed that the cultivar 'Kulai' was highly resistant. Three accessions were moderately resistant while all others were susceptible to highly susceptible. Anatomical study of resistant and susceptible cultivars showed significant differences in several anatomical characters which may contribute to the limitation of the infection process, movement and multiplication of the pathogen. Population dynamics of the pathogen in susceptible and resistant cultivars revealed that in susceptible cultivar bacterial population did not differ after inoculation, at all sites tested, regardless of inoculation techniques used. Bacterial population differed significantly between cultivars at similar sites tested and for all the techniques used. Bacterial population in stem, root and soil-inoculated resistant plants decreased significantly at all sites. However, when soil-inoculated, the pathogen was not detected from the mid stem only. Thus, the infection was not limited but the resistance may be due to the lower rate of multiplication of the pathogen in resistant plants. Plant infection Plant diseases Capsicum annuum - Disease and pest resistance 1997 Thesis http://psasir.upm.edu.my/id/eprint/10405/ http://psasir.upm.edu.my/id/eprint/10405/1/FP_1997_14_A.pdf application/pdf en public phd doctoral Universiti Putra Malaysia Plant infection Plant diseases Capsicum annuum - Disease and pest resistance Faculty of Agriculture English
institution	Universiti Putra Malaysia
collection	PSAS Institutional Repository
language	English English
topic	Plant infection Plant diseases Capsicum annuum - Disease and pest resistance
spellingShingle	Plant infection Plant diseases Capsicum annuum - Disease and pest resistance Abdul Rahman, Muhammed Infection and Some Aspects of Resistance Mechanism of Capsicum Annuum to Ralstonia Solanacearum
description	Bacterial wilt of chilli (Capsicum annuum L.) caused by Ralstonia solanacearum is a major constraint to the production of the crop in Malaysia. To-date very few resistant germplasm of chilli to the pathogen is known. Information on the mechanism of infection and resistance, and multiplication of the pathogen in chilli are lacking. There is also no information on the anatomical characters of the hosts which might be related to resistance. The present study was, therefore, undertaken to obtain this information which would provide an understanding of the disease. It could be useful in formulating wilt-resistance breeding programme in chilli and an effective control measures for the disease. Greenhouse evaluation of the susceptibility of accessions/cultivars of Capsicum spp. to R. solanacearum revealed that the cultivar 'Kulai' was highly resistant. Three accessions were moderately resistant while all others were susceptible to highly susceptible. Anatomical study of resistant and susceptible cultivars showed significant differences in several anatomical characters which may contribute to the limitation of the infection process, movement and multiplication of the pathogen. Population dynamics of the pathogen in susceptible and resistant cultivars revealed that in susceptible cultivar bacterial population did not differ after inoculation, at all sites tested, regardless of inoculation techniques used. Bacterial population differed significantly between cultivars at similar sites tested and for all the techniques used. Bacterial population in stem, root and soil-inoculated resistant plants decreased significantly at all sites. However, when soil-inoculated, the pathogen was not detected from the mid stem only. Thus, the infection was not limited but the resistance may be due to the lower rate of multiplication of the pathogen in resistant plants.
format	Thesis
qualification_name	Doctor of Philosophy (PhD.)
qualification_level	Doctorate
author	Abdul Rahman, Muhammed
author_facet	Abdul Rahman, Muhammed
author_sort	Abdul Rahman, Muhammed
title	Infection and Some Aspects of Resistance Mechanism of Capsicum Annuum to Ralstonia Solanacearum
title_short	Infection and Some Aspects of Resistance Mechanism of Capsicum Annuum to Ralstonia Solanacearum
title_full	Infection and Some Aspects of Resistance Mechanism of Capsicum Annuum to Ralstonia Solanacearum
title_fullStr	Infection and Some Aspects of Resistance Mechanism of Capsicum Annuum to Ralstonia Solanacearum
title_full_unstemmed	Infection and Some Aspects of Resistance Mechanism of Capsicum Annuum to Ralstonia Solanacearum
title_sort	infection and some aspects of resistance mechanism of capsicum annuum to ralstonia solanacearum
granting_institution	Universiti Putra Malaysia
granting_department	Faculty of Agriculture
publishDate	1997
url	http://psasir.upm.edu.my/id/eprint/10405/1/FP_1997_14_A.pdf
_version_	1747811114511499264

Infection and Some Aspects of Resistance Mechanism of Capsicum Annuum to Ralstonia Solanacearum

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