Management of Brown Leaf Rust, Puccinia recondita of Wheat Using Natural Products and Biocontrol Agents

2001 ◽  
Vol 4 (5) ◽  
pp. 550-553 ◽  
Author(s):  
Hamdy A. Eldoksch . ◽  
Matilda F. Atteia . ◽  
Samiha M.H. Abdel-Mo .
Keyword(s):  
Natural Products ◽  
Leaf Rust ◽  
Biocontrol Agents ◽  
Puccinia Recondita ◽  
Brown Leaf

THE INHERITANCE OF RESISTANCE IN RYE TO Puccinia recondita f. sp. secalis and f. sp. tritici

1984 ◽  
Vol 64 (3) ◽  
pp. 511-519 ◽  
Author(s):  
G. L. C. MUSA ◽  
P. L. DYCK ◽  
D. J. SAMBORSKI
Keyword(s):  
Disease Resistance ◽  
Leaf Rust ◽  
Secale Cereale ◽  
Single Gene ◽  
Inbred Lines ◽  
Puccinia Recondita ◽  
Wheat Leaf Rust ◽  
Susceptible Parent ◽  
Seedling Resistance ◽  
Wheat Leaf

The inheritance of seedling resistance to isolate RLR 213/78 of rye leaf rust (Puccinia recondita f. sp. secalis) and race 30 of wheat leaf rust (P. recondita f. sp. tritici Rob.) was investigated in six inbred lines of rye (Secale cereale). Inbred line UM8116 was used as the susceptible parent in crosses. Inbred lines UM8003, UM8071 and UM8301 each have a single gene and UM8336 and UM8340 each have two genes for resistance to rye leaf rust. For resistance to wheat leaf rust UM8071 has a single gene, UM8003 and UM8340 each have two genes and UM8301 and UM8336 each have three genes. UM8295 is heterogeneous for reaction to both rusts. One of the genes in UM8340 may condition resistance to both rusts. The genes for resistance to RLR 213/78 appear to be independently inherited while some of the genes conferring resistance to race 30 may be identical or very closely linked. The potential of rye as a source of disease resistance for wheat and triticale improvement is discussed.Key words: Secale cereale, disease resistance, wheat leaf rust

scholarly journals Genetic studies in wheat for leaf rust resistance (Puccinia recondita)

2011 ◽  
Vol 10 (16) ◽  
pp. 3051-3054 ◽  
Author(s):  
Hussain Fida ◽  
Ashraf M ◽  
A Hameed Muhammad ◽  
Hussain Nisar ◽  
Ahmad Sial Riaz
Keyword(s):  
Leaf Rust ◽  
Rust Resistance ◽  
Leaf Rust Resistance ◽  
Puccinia Recondita ◽  
Genetic Studies

scholarly journals Biocontrol Potential of Essential Oils in Organic Horticulture Systems: From Farm to Fork

2022 ◽  
Vol 8 ◽  
Author(s):  
Yuru Chang ◽  
Philip F. Harmon ◽  
Danielle D. Treadwell ◽  
Daniel Carrillo ◽  
Ali Sarkhosh ◽  
...  
Keyword(s):  
Natural Products ◽  
Essential Oils ◽  
Water Solubility ◽  
Scientific Evidence ◽  
Plant Diseases ◽  
Biocontrol Agents ◽  
Market Demand ◽  
High Volatility ◽  
Biocontrol Potential ◽  
Organic Horticulture

In recent decades, increasing attention has been paid to food safety and organic horticulture. Thus, people are looking for natural products to manage plant diseases, pests, and weeds. Essential oils (EOs) or EO-based products are potentially promising candidates for biocontrol agents due to their safe, bioactive, biodegradable, ecologically, and economically viable properties. Born of necessity or commercial interest to satisfy market demand for natural products, this emerging technology is highly anticipated, but its application has been limited without the benefit of a thorough analysis of the scientific evidence on efficacy, scope, and mechanism of action. This review covers the uses of EOs as broad-spectrum biocontrol agents in both preharvest and postharvest systems. The known functions of EOs in suppressing fungi, bacteria, viruses, pests, and weeds are briefly summarized. Related results and possible modes of action from recent research are listed. The weaknesses of applying EOs are also discussed, such as high volatility and low stability, low water solubility, strong influence on organoleptic properties, and phytotoxic effects. Therefore, EO formulations and methods of incorporation to enhance the strengths and compensate for the shortages are outlined. This review also concludes with research directions needed to better understand and fully evaluate EOs and provides an outlook on the prospects for future applications of EOs in organic horticulture production.

Molecular and virulence diversity and linkage disequilibria in asexual and sexual populations of the wheat leaf rust fungus, Puccinia recondita

Genome ◽  
1998 ◽  
Vol 41 (6) ◽  
pp. 832-840 ◽  
Author(s):  
J Q Liu ◽  
J A Kolmer
Keyword(s):  
Leaf Rust ◽  
Rust Fungus ◽  
Field Population ◽  
Puccinia Recondita ◽  
Wheat Leaf Rust ◽  
Asexual Population ◽  
Sexual Population ◽  
Linkage Disequilibria ◽  
Wheat Leaf ◽  
Virulence Diversity

An asexual field population and a sexually derived population of the wheat leaf rust fungus, Puccinia recondita, were examined and compared for diversity and linkage disequilibria between virulence and molecular phenotypes. Isolates in both populations were tested for virulence to 20 Thatcher wheat lines near-isogenic for leaf rust resistance genes, and for random amplified polymorphic DNA (RAPD) variation using 10 DNA primers. In the asexual field population, 36 virulence phenotypes and 14 RAPD phenotypes were identified in 43 isolates. In the sexual population, 87 virulence phenotypes and 79 RAPD phenotypes were identified in 104 isolates. Linkage disequilibria was less in the sexual population compared to the asexual field population. Virulence-RAPD phenotype pairs (110 in total) were directly compared between the two populations for association. In the asexual population, 39 virulence-RAPD phenotype pairs were associated (P < 0.05), compared with 18 pairs in the sexual population. Linkage was not evident, as some residual disequilibria remained between virulence and RAPD phenotypes. In the asexual population 18 RAPD phenotype pairs were associated, compared with 9 pairs in the sexual population. The sexual population was also tested for RAPD variation with an additional six primers. In the sexual population, amplification sites of four different primers were tightly linked which indicated a chromosomal segment in P. recondita may not readily undergo recombination. Disequilibria between virulence and RAPD phenotypes in field populations of P. recondita in Canada is maintained by asexual reproduction.Key words: Puccinia recondita, molecular diversity, virulence diversity, linkage disequilibria, wheat leaf rust.

COMPUTER ANALYSIS OF DISEASE DATA TO DERIVE HYPOTHETICAL GENOTYPES FOR REACTION OF HOST VARIETIES TO PATHOGENS

1971 ◽  
Vol 13 (4) ◽  
pp. 742-748 ◽  
Author(s):  
W. Q. Loegering ◽  
R. A. McIntosh ◽  
Coleman H. Burton
Keyword(s):  
Boolean Algebra ◽  
Computer Program ◽  
Leaf Rust ◽  
Visual Inspection ◽  
Puccinia Recondita ◽  
Wheat Leaf Rust ◽  
High Infection ◽  
Wheat Leaf ◽  
Infection Types ◽  
Genotype A

A method is described for deriving genotypes for low reaction in varieties of a host from data resulting from inoculating many host varieties with many cultures of a pathogen. A computer program utilizing Boolean algebra was used to compare and group patterns of low and high infection types produced by host variety: pathogen culture combinations. Visual inspection within each group allows derivation of the genotype. A successful trial of the system was made with data on wheat leaf rust involving 60 varieties of wheat and nine cultures of Puccinia recondita.

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