Susceptibility of Capsicum Species and Cultivars to Ralstonia solanacearum: Anatomical Differences and Bacterial Multiplication in Resistant and Susceptible Cultivars

M. A., Rahman and Abdullah, Hiryati (1997) Susceptibility of Capsicum Species and Cultivars to Ralstonia solanacearum: Anatomical Differences and Bacterial Multiplication in Resistant and Susceptible Cultivars. Pertanika Journal of Tropical Agricultural Science, 20 (1). pp. 1-11. ISSN 0126-6128

[img] PDF
3705Kb

Abstract

Greenhouse evaluation of 42 accessions/cultivars of Capsicum spp. to bacterial wilt caused by Ralstonia solanacearum revealed that the Malaysian local cultivar 'Kulai' was highly resistant. Three accessions, namely CO 1969, CO 1970 and CO 1553, were moderately resistant; all other accessions were susceptible to highly susceptible. Anatomical study of resistant and susceptible cultivars indicated significant differences in certain anatomical characters. The number of vascular strands per root was fewer, the cortex was thicker, and the length of xylem elements was shorter in the roots of resistant cultivars than the susceptible cultivar. The average number of vascular bundles per plant and the number of xylem elements per vascular bundle were fewer and the length and diameter of xylem elements were shorter in the mid-stem of resistant cultivars. These anatomical characters of resistant plants may contribute to limit or slow down the infection process, movement and multiplication of the pathogen. Multiplication ofR. solanacearum at mid-stem, collar and tap root in stem-inoculated susceptible and resistant chilli cultivars revealed that in susceptible cultivars the bacterial population did not differ at all sites tested, but it differed significantly between cultivars at similar sampling sites. These findings show that the mechanism of resistance to the disease is mainly due to the reduced rate of multiplication of the pathogen within the resistant host.

Item Type:Article
Keyword:susceptibility, Capsicum spp., Ralstonia solanacearu~ anatomy, bacterial multiplication
Faculty or Institute:Faculty of Agriculture
Publisher:Universiti Putra Malaysia Press
ID Code:3647
Deposited By: Nasirah Abu Samah
Deposited On:30 Nov 2009 09:06
Last Modified:27 May 2013 07:10

Repository Staff Only: item control page


Universiti Putra Malaysia Institutional Repository

Universiti Putra Malaysia Institutional Repository is an on-line digital archive that serves as a central collection and storage of scientific information and research at the Universiti Putra Malaysia.

Currently, the collections deposited in the IR consists of Master and PhD theses, Master and PhD Project Report, Journal Articles, Journal Bulletins, Conference Papers, UPM News, Newspaper Cuttings, Patents and Inaugural Lectures.

As the policy of the university does not permit users to view thesis in full text, access is only given to the first 24 pages only.