Aspects of quantitative resistance to Xanthomonas campestris pv. oryzae in rice

M.F. Koch

Research output: Thesisinternal PhD, WU

Abstract

<p><TT>Quantitative resistance (QR) to</TT><em>Xanthomonas campestris</em> pv. <em>oryzae</em> (Xco), <em></em><TT>the causal organism of bacterial blight in rice, is evident as reduced lesion length and slowed lesion development relative to lesions in susceptible cultivars. QR was evident at all growth stages and leaf ages as a reduction in lesion length following clip inoculation with virulent isolates of the pathogen. QR affects the ability of bacterial cells to establish and multiply within a leaf. No confirmed evidence of cultivar x isolate interactions of QR factors was found. Varying levels of incomplete race-specific major gene resistance were found and were difficult to distinguish from differences in QR.</TT><p><TT>Differences between cultivars for lesion number following spray inoculation varied from the differences in lesion length following clip inoculation, indicating the presence of an extra component of resistance limiting bacterial entry into intact leaves.</TT><p><TT>Multiple QR resistance factors were shown to be present in four moderately resistant cultivars. A minimum of five factors was found in varying combinations in six rice cultivars. The residual effect of the Xa-4 gene for resistance, or a closely linked gene, also imparted some level of QR. Selection using one isolate was effective in improving the level of QR to another isolate.</TT>
Original languageEnglish
QualificationDoctor of Philosophy
Awarding Institution
Supervisors/Advisors
  • Parlevliet, J.E., Promotor
Award date12 Jan 1990
Place of PublicationS.l.
Publisher
Print ISBNs9789090031743
Publication statusPublished - 1990

Fingerprint

Xanthomonas oryzae pv. oryzae
lesions (plant)
rice
cultivars
leaves
Oryza
residual effects
major genes
blight
genes
developmental stages
pathogens
organisms

Keywords

  • plant breeding
  • disease resistance
  • pest resistance
  • rice
  • oryza sativa
  • plant diseases
  • plant pathogenic bacteria

Cite this

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title = "Aspects of quantitative resistance to Xanthomonas campestris pv. oryzae in rice",
abstract = "<TT>Quantitative resistance (QR) toXanthomonas campestris pv. oryzae (Xco), <TT>the causal organism of bacterial blight in rice, is evident as reduced lesion length and slowed lesion development relative to lesions in susceptible cultivars. QR was evident at all growth stages and leaf ages as a reduction in lesion length following clip inoculation with virulent isolates of the pathogen. QR affects the ability of bacterial cells to establish and multiply within a leaf. No confirmed evidence of cultivar x isolate interactions of QR factors was found. Varying levels of incomplete race-specific major gene resistance were found and were difficult to distinguish from differences in QR.<TT>Differences between cultivars for lesion number following spray inoculation varied from the differences in lesion length following clip inoculation, indicating the presence of an extra component of resistance limiting bacterial entry into intact leaves.<TT>Multiple QR resistance factors were shown to be present in four moderately resistant cultivars. A minimum of five factors was found in varying combinations in six rice cultivars. The residual effect of the Xa-4 gene for resistance, or a closely linked gene, also imparted some level of QR. Selection using one isolate was effective in improving the level of QR to another isolate.",
keywords = "plantenveredeling, ziekteresistentie, plaagresistentie, rijst, oryza sativa, plantenziekten, plantenziekteverwekkende bacteri{\"e}n, plant breeding, disease resistance, pest resistance, rice, oryza sativa, plant diseases, plant pathogenic bacteria",
author = "M.F. Koch",
note = "WU thesis 1330 Proefschrift Wageningen",
year = "1990",
language = "English",
isbn = "9789090031743",
publisher = "Koch",

}

Aspects of quantitative resistance to Xanthomonas campestris pv. oryzae in rice. / Koch, M.F.

S.l. : Koch, 1990. 174 p.

Research output: Thesisinternal PhD, WU

TY - THES

T1 - Aspects of quantitative resistance to Xanthomonas campestris pv. oryzae in rice

AU - Koch, M.F.

N1 - WU thesis 1330 Proefschrift Wageningen

PY - 1990

Y1 - 1990

N2 - <TT>Quantitative resistance (QR) toXanthomonas campestris pv. oryzae (Xco), <TT>the causal organism of bacterial blight in rice, is evident as reduced lesion length and slowed lesion development relative to lesions in susceptible cultivars. QR was evident at all growth stages and leaf ages as a reduction in lesion length following clip inoculation with virulent isolates of the pathogen. QR affects the ability of bacterial cells to establish and multiply within a leaf. No confirmed evidence of cultivar x isolate interactions of QR factors was found. Varying levels of incomplete race-specific major gene resistance were found and were difficult to distinguish from differences in QR.<TT>Differences between cultivars for lesion number following spray inoculation varied from the differences in lesion length following clip inoculation, indicating the presence of an extra component of resistance limiting bacterial entry into intact leaves.<TT>Multiple QR resistance factors were shown to be present in four moderately resistant cultivars. A minimum of five factors was found in varying combinations in six rice cultivars. The residual effect of the Xa-4 gene for resistance, or a closely linked gene, also imparted some level of QR. Selection using one isolate was effective in improving the level of QR to another isolate.

AB - <TT>Quantitative resistance (QR) toXanthomonas campestris pv. oryzae (Xco), <TT>the causal organism of bacterial blight in rice, is evident as reduced lesion length and slowed lesion development relative to lesions in susceptible cultivars. QR was evident at all growth stages and leaf ages as a reduction in lesion length following clip inoculation with virulent isolates of the pathogen. QR affects the ability of bacterial cells to establish and multiply within a leaf. No confirmed evidence of cultivar x isolate interactions of QR factors was found. Varying levels of incomplete race-specific major gene resistance were found and were difficult to distinguish from differences in QR.<TT>Differences between cultivars for lesion number following spray inoculation varied from the differences in lesion length following clip inoculation, indicating the presence of an extra component of resistance limiting bacterial entry into intact leaves.<TT>Multiple QR resistance factors were shown to be present in four moderately resistant cultivars. A minimum of five factors was found in varying combinations in six rice cultivars. The residual effect of the Xa-4 gene for resistance, or a closely linked gene, also imparted some level of QR. Selection using one isolate was effective in improving the level of QR to another isolate.

KW - plantenveredeling

KW - ziekteresistentie

KW - plaagresistentie

KW - rijst

KW - oryza sativa

KW - plantenziekten

KW - plantenziekteverwekkende bacteriën

KW - plant breeding

KW - disease resistance

KW - pest resistance

KW - rice

KW - oryza sativa

KW - plant diseases

KW - plant pathogenic bacteria

M3 - internal PhD, WU

SN - 9789090031743

PB - Koch

CY - S.l.

ER -