Evidence for Differential Resistance to <i>Peronospora parasitica</i> (downy mildew) in Accessions of <i>Brassica juncea</i> (mustard) at the Cotyledon Stage

Nashaat, N. I.; Awasthi, R. P.

doi:10.1111/j.1439-0434.1995.tb00250.x

Cited by 22 publications

(13 citation statements)

References 3 publications

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“…Extending the number of differential reactions in the present study to 17 groups of accessions (A-Q) against 14 pathogen isolates may provide pathologists and breeders with improved tools for the detection of new physiological races. Such tools can also be very helpful and may also save time for selecting appropriate parental lines for crosses that may be required to produce a wide resistant The results are in support of the conclusion of previous investigations Lucas 1990, Nashaat andAwasthi 1995) that isolates from different Brassica species are most virulent on their species of origin as demonstrated in this study by the highest frequency of susceptibility recorded of B. juncea to isolates derived from B. juncea. This was followed by isolates derived from B. rapa and then B. napus.…”

Section: Discussionsupporting

confidence: 93%

“…Such sources might usefully be deployed with fungicides to prolong the effectiveness of both control procedures. Evidence for five differential responses in B. juncea to four isolates of P. parasitica, two derived from B. juncea and the other two from B. napus, have been previously reported (Nashaat and Awasthi 1995). Differential resistance to P. parasitica has also been reported in other Brassica species (Moss et al 1991, Nashaat and Rawlinson 1994, Silue´et al 1996, Nashaat et al 1997.…”

mentioning

confidence: 81%

“…Germplasm screening and evaluation: Host accessions and their sources are listed in Table 2. Most of these accessions were selected from seedling populations of accessions that expressed heterogeneous response to some P. parasitica isolates (Nashaat and Awasthi 1995). Up to five seedlings were grown from non-treated seed in each of several 5 cm Jiffy-pots containing soilless compost.…”

Section: Methodsmentioning

confidence: 99%

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Differential response and genes for resistance to Peronospora parasitica (downy mildew) in Brassica juncea (mustard)

Nashaat¹,

Heran²,

Awasthi

et al. 2004

Plant Breeding

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The response of a wide range of Brassica juncea accessions to 14 isolates of Peronospora parasitica, 12 from India (IP00A, IP02, IP03, IP04, IP04A, IP05, IP05B, IP33 and IP33A were derived from B. juncea; IP09, IP14 and IP13A from B. rapa) and two from B. napus in the UK (R1 and P003), was screened. Sixteen differential host response groups to these isolates (classified as groups A-P) were identified. Groups ÔAÕ and ÔBÕ expressed the widest resistance profiles to these isolates. Group ÔAÕ was susceptible to isolates IP05 and IP05B, moderately resistant to isolate IP33 and resistant to all other isolates. Group ÔBÕ was susceptible to isolates IP03, IP04 and IP04A, and resistant to the other isolates. Putative homozygous lines resistant to all 14 isolates were selected from the F 4 progeny of crosses involving lines RESBJ-200 from group ÔAÕ (selection from cv. Kranti) and RESBJ-190 from group ÔBÕ (selection from cv. Krishna). Both selections were selfed and tested for uniformity of reactions to all isolates for three generations. The resistance of RESBJ-200 to isolates IP00A, IP04A and IP33A seems to be conditioned by single dominant genes. The resistance of RESBJ-190 to isolates IP00A, IP05B and IP33A was also conditioned by single dominant genes. The gene for resistance to IP00A and IP33A in RESBJ-200 seems to be independent of the genes for resistance to the same isolates in RESBJ-190. The new genes for differential resistance to P. parasitica will be of value in future studies of the genetics of the host-pathogen interaction and for breeding for disease resistance.

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confidence: 93%

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confidence: 81%

Section: Methodsmentioning

confidence: 99%

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Differential response and genes for resistance to Peronospora parasitica (downy mildew) in Brassica juncea (mustard)

Nashaat¹,

Heran²,

Awasthi

et al. 2004

Plant Breeding

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“…The zoosporangiophores of H. parasitica that subtend zoosporangia emerge in profusion from stomata without forcible damage of host tissue (Borhan et al 2001). While both these pathogens usually exist as specialized pathotypes on different cruciferous species, and even on different cultivars within a species, asexual reproduction in general is most prolific on the particular host of origin (Mathur et al 1995;Nashaat and Awasthi 1995;Petrie 1988;Pidskalny and Rimmer 1985;Saharan and Verma 1992;Silué et al 1996).…”

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confidence: 95%

Pre-inoculation with Hyaloperonospora parasitica reduces incubation period and increases severity of disease caused by Albugo candida in a Brassica juncea variety resistant to downy mildew

Kaur

Sivasithamparam

et al. 2011

J Gen Plant Pathol

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Studies were undertaken to determine any interaction of an asymptomatic isolate of Hyaloperonospora parasitica (downy mildew) with a virulent isolate of Albugo candida (white rust) and Brassica juncea. White rust symptoms appeared 4 days earlier and were significantly more severe when a variety of B. juncea resistant to downy mildew but highly susceptible to white rust was first inoculated with A. candida followed 10 days later with H. parasitica. DNA extractions of tissues indicated H. parasitica had colonized the asymptomatic plants systemically. These are the first reports of (a) the systemic colonization by H. parasitica in a host resistant to downy mildew, and (b) the increase in susceptibility of a Brassica to white rust disease from asymptomatic colonization by H. parasitica.

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“…Differential responses to P. parasitica expressed at the cotyledon stage have also been reported in other Brassica spp. (Moss et al, 1991;Nashaat & Awasthi, 1995;Silué et al, 1996). This study reports the identification of a fourth differential response to P. parasitica in B. napus, present in RES-26, and describes aspects of inheritance of resistance in RES-26 and RES-02.…”

Section: Introductionmentioning

confidence: 99%

New genes for resistance to downy mildew (Peronospora parasitica) in oilseed rape (Brassica napus ssp. oleifera)

et al. 1997

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The response of cotyledons of oilseed rape (Brassica napus ssp. oleifera) accessions to infection by isolates of Peronospora parasitica under controlled conditions was assessed on a 0–7 scale (disease reaction). In interactions scored 0–3, 4–5 and 6–7, the host was considered resistant, partially resistant and susceptible, respectively. Accession RES‐26, selected from the spring oilseed rape cultivar Janetzkis, was partially resistant to isolate R1 and resistant to isolate P003 of P. parasitica, which distinguishes it from three previously described differential response groups (‘A’, ‘B’ and ‘C’) of accessions in B. napus. The resistance of RES‐26 to isolate P003 seemed to be conditioned by a single, partially dominant gene and the resistance of RES‐02, which belongs to group ‘A’ (resistant to R1 and P003), by two independent partially dominant genes. The gene for resistance to P003 in RES‐26 is either closely linked, allelic or identical to one of the two genes for resistance in RES‐02. Resistance of RES‐02 to R1 is conditioned by a single, incompletely dominant gene. The genes for resistance to isolates R1 and P003 in RES‐02 are either closely linked, allelic or identical. The cotyledonary leaves of each seedling responded independently when inoculated simultaneously each with a different isolate of the pathogen.

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Evidence for Differential Resistance to Peronospora parasitica (downy mildew) in Accessions of Brassica juncea (mustard) at the Cotyledon Stage

Cited by 22 publications

References 3 publications

Differential response and genes for resistance to Peronospora parasitica (downy mildew) in Brassica juncea (mustard)

Differential response and genes for resistance to Peronospora parasitica (downy mildew) in Brassica juncea (mustard)

Pre-inoculation with Hyaloperonospora parasitica reduces incubation period and increases severity of disease caused by Albugo candida in a Brassica juncea variety resistant to downy mildew

New genes for resistance to downy mildew (Peronospora parasitica) in oilseed rape (Brassica napus ssp. oleifera)

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