partial resistance

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Identification of QTL Involved in Resistance of Barley Seedling to Scald (Rhynchosporium secalis)

Journal Title, Volume, Page: 
Hebron University Research Journal (A). Vol.(5), pp.(49 – 62)
Year of Publication: 
2011
Authors: 
Munqez J. Y. Shtaya
Department of Plant Production and Protection, Faculty of Agriculture, An-Najah National University
Current Affiliation: 
Department of Plant Production and Protection,Faculty of Agriculture and Veterinary Medicine, An Najah National University, Nablus, Palestine
Fernando Martínez
Universidad de Sevilla, Dpto, Ciencias Agroforestales, Spain
Preferred Abstract (Original): 
A population of 103 recombinant inbred lines (RILs) of barley, that were developed from the cross L94x’Vada’ was evaluated at seedling stage for resistance against scald (Rhynchosporium secalis) in a sporeproof air-conditioned glasshouse. Two isolates of R. secalis were used: B9 and 13-13. Both isolates were collected in fields at SCRI (Scottish Crop Research Institute) near Dundee, Scotland, UK. Under glasshouse conditions, two quantitative trait loci (QTLs) for partial resistance (PR) to scald were identified.
One QTL (Rrsq1) was detected on chromosome 3 (3H) for latency period and lesion length only against B9 isolate, whereas the other QTL (Rrsq2, on chromosome 7H) was identified for lesion length of both isolates. Rrsq1 was mapped at a region where a QTL was detected, using the same population, for partial resistance to scald under field conditions whereas Rrsq2 was mapped at a similar position as the locus Rrs2 for scald resistance. These cases of co-location of QTL with major genes, not very common, may suggest that some QTL are actually alleles of known major resistance genes.
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The Resistance to Leaf Rust and Powdery Mildew of Recombinant Liines of Barley (Hordeum vulgare L.)

Journal Title, Volume, Page: 
Plant Breeding Volume 126, Issue 3, pages 259–267
Year of Publication: 
2007
Authors: 
M. J. Y. Shtaya
Present address: Faculty of Agriculture, An-Najah National University, PO Box 707, Nablus, Palestine
Current Affiliation: 
Department of Plant Production and Protection,Faculty of Agriculture and Veterinary Medicine, An Najah National University, Nablus, Palestine
J. C. Sillero
CIFA, Alameda Del Obispo, IFAPA-CICE, Apdo. 3092, E-14080 Córdoba, Spain
K. Flath
Federal Biological Research Centre for Agriculture and Forestry, Institute of Plant Protection in Field Crops and Grassland, D-14532 Kleinmachnow, Germany
R. Pickering
New Zealand Institute for Crop & Food Research, Private Bag 4704, Christchurch, New Zealand
D. Rubiales
Institute of Sustainable Agriculture, CSIC, Apdo. 4084, E-14080 Córdoba, Spain
Preferred Abstract (Original): 

A set of 23 recombinant lines (RLs) of barley (Hordeum vulgare L.) derived from H. vulgare × H. bulbosum L. crosses was inoculated with barley leaf rust (Puccinia hordei) and powdery mildew (Blumeria graminis f.sp. hordei) at the seedling stage to identify their levels and mechanisms of resistance. Eight RLs were studied further in glasshouse and field tests. All three barley parents (‘Emir’, ‘Golden Promise’ and ‘Vada’) were highly susceptible to powdery mildew and leaf rust isolates. Several RLs showed partial resistance expressed as high relative latency periods and low relative infection frequencies against leaf rust. This high level of partial resistance was due to a very high level of early aborting colonies without host cell necrosis. Several RLs showed hypersensitive resistance to some or all isolates. For powdery mildew, one RL was completely resistant to the CC1 isolate and had a hypersensitive resistance to the CO-02 isolate. Three RLs derived from ‘Emir’ were completely resistant to both powdery mildew isolates, and three more RLs tested in the field had higher levels of partial resistance than their parents. The results indicate that H. bulbosum contains major and minor gene(s) for resistance to leaf rust and powdery mildew that can be transferred to cultivated barley.

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Identification of Resistant Sources to Crown Rust (Puccinia Coronata) in Oat

Journal Title, Volume, Page: 
An-Najah University Journal for Research (Natural Sciences), 27 (1)
Year of Publication: 
2013
Authors: 
Munqez Shtaya
Department of Plant Production & Protection, An-Najah University, Palestine.
Current Affiliation: 
Department of Plant Production and Protection,Faculty of Agriculture and Veterinary Medicine, An Najah National University, Nablus, Palestine
Omar Abo Baker
Department of Plant Production & Protection, An-Najah University, Palestine.
Preferred Abstract (Original): 
This study was conducted to search for new resistant sources to oat leaf rust as well as to characterize the macroscopic components of resistance to crown rust under controlled conditions. One hundred twenty different accessions of oats obtained from the National Small Grains Collection, Idaho (NSGC), USA, in addition to a local susceptible wild accession were used in this study during the growing season of 2008- 2009. Disease severity (DS) was calculated three times during the growing season at two week intervals. DS values were used to calculate Area under Disease Progress Curve (AUDPC). The results of this study revealed that the local susceptible (control) accession had 48% DS (100% AUDPC) of leaf rust, and DS for the tested accessions ranged from very high to very low, and the distribution was markedly shifted towards low DS. 50% of the collection showed AUDPC < 50%, while thirteen cultivars. (10.8% of the collection) with AUDPC ≤ 20%, were selected to study their reaction to artificial inoculation with uredio spores of Puccinia coronata at seedling stage. All the tested accessions showed significantly higher relative latency period (RLP) and lower relative infection frequency (RIF) in comparison to the susceptible control. These resistant cultivars were planted in the field to produce grains for further studies.
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