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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| Format: | Thesis |
| Language: | English English |
| Published: |
1997
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| Subjects: | |
| Online Access: | http://psasir.upm.edu.my/id/eprint/10405/1/FP_1997_14_A.pdf |
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| Summary: | 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. |
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