Genetics of resistance to Puccinia graminis tritici and Puccinia recondita tritici in Kenya Plume wheat

Singh, R. P.; McIntosh, R. A.

doi:10.1007/bf00028563

Cited by 15 publications

(8 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Sr2 was detected in several highly resistant old, tall Kenyan varieties, including Kenya Plume (45), and CIMMYT-derived semidwarf wheats Pavon 76, Parula, Kritati, and Kingbird (32,43). These CIMMYT wheats were susceptible in seedling greenhouse tests with Ug99 but showed high levels of adult plant resistance to Ug99 in field trials conducted since 2005 in Kenya and Ethiopia.…”

Section: Adult Plant Resistance With Complex Inheritancementioning

confidence: 99%

The Emergence of Ug99 Races of the Stem Rust Fungus is a Threat to World Wheat Production

Singh

Hodson

Espino

et al. 2011

Annu. Rev. Phytopathol.

631

490

View full text Add to dashboard Cite

Race Ug99 of the fungus Puccinia graminis tritici that causes stem or black rust disease on wheat was first detected in Uganda in 1998. Seven races belonging to the Ug99 lineage are now known and have spread to various wheat-growing countries in the eastern African highlands, as well as Zimbabwe, South Africa, Sudan, Yemen, and Iran. Because of the susceptibility of 90% of the wheat varieties grown worldwide, the Ug99 group of races was recognized as a major threat to wheat production and food security. Its spread, either wind-mediated or human-aided, to other countries in Africa, Asia, and beyond is evident. Screening in Kenya and Ethiopia has identified a low frequency of resistant wheat varieties and breeding materials. Identification and transfer of new sources of race-specific resistance from various wheat relatives is underway to enhance the diversity of resistance. Although new Ug99-resistant varieties that yield more than current popular varieties are being released and promoted, major efforts are required to displace current Ug99 susceptible varieties with varieties that have diverse race-specific or durable resistance and mitigate the Ug99 threat.

show abstract

Section: Adult Plant Resistance With Complex Inheritancementioning

confidence: 99%

The Emergence of Ug99 Races of the Stem Rust Fungus is a Threat to World Wheat Production

Singh

Hodson

Espino

et al. 2011

Annu. Rev. Phytopathol.

631

490

View full text Add to dashboard Cite

show abstract

“…However, the level of resistance conferred by Sr2 alone under high disease pressure in Kenya was not sufficient. Sr2 was detected in several highly resistant old, tall Kenyan cultivars, including 'Kenya Plume' [44], and CIMMYT-derived wheats 'Pavon 76', 'Juchi 2000' and 'Kritati'. Pavon 76 and Kiritati were resistant during 2004, 2005 and 2006 with maximum disease score of 20MR-MS. Because all three of these wheat cutlivars are susceptible as seedlings with race TTKS, their resistance as speculated earlier [9] is based on multiple additive genes where Sr2 is an important component.…”

Section: Durable Resistance and Hope Derived Sr2-complex'mentioning

confidence: 99%

Current status, likely migration and strategies to mitigate the threat to wheat production from rzace Ug99 (TTKS) of stem rust pathogen.

Singh¹,

Hodson²,

Jin³

et al. 2007

CABI Reviews

Self Cite

264

224

View full text Add to dashboard Cite

Stem or black rust, caused by Puccinia graminis tritici, has historically caused severe losses to wheat (Triticum aestivum) production worldwide. Successful control of the disease for over three decades through the use of genetic resistance has resulted in a sharp decline in research activity in recent years. Detection and spread in East Africa of race TTKS, commonly known as Ug99, is of high significance as most wheat cultivars currently grown in its likely migration path, i.e. to North Africa through Arabian Peninsula and then to Middle East and Asia, are highly susceptible to this race and the environment is conducive to disease epidemics. Identifying/developing adapted resistant cultivars in a relatively short time and replacing the susceptible cultivars before rust migrates out of East Africa is the strategy to mitigate potential losses. Although several alien genes will provide resistance to this race, the long-term strategy should focus on rebuilding the 'Sr2-complex' (combination of slow rusting gene Sr2 with other unknown additive genes of similar nature) to achieve long-term durability. A Global Rust Initiative has been launched to monitor the further migration of this race, facilitate field testing in Kenya or Ethiopia of wheat cultivars and germplasm developed by wheat breeding programmes worldwide, understand the genetic basis of resistanceespecially the durable type, carry out targeted breeding to incorporate diverse resistance genes into key cultivars and germplasm, and enhance the capacity of national programmes. A few wheat genotypes that combine stem rust resistance with high yield potential and other necessary traits have been identified but need rigorous field testing to determine their adaptation in target areas.

show abstract

“…To achieve sustainable resistance to diseases in crops, it is often necessary to stay ahead of changing pathogens by searching for, understanding, and manipulating new sources of resistance (Singh and McIntosh 1990). Eorts to breed cereals for resistance to rust diseases have identi®ed resistances that are expressed at seedling growth stages (one or two leaves) and that usually remain eective throughout the life of the plant (seedling resistances), and resistances that are eective at adult plant growth stages only (adult plant resistance; APR).…”

mentioning

confidence: 99%

Inheritance of seedling and adult plant resistance to leaf rust of selected Australian spring and English winter wheat varieties

Singh¹,

Park²,

McIntosh³

2001

Plant Breeding

Self Cite

View full text Add to dashboard Cite

Genetic studies were conducted to gain an understanding of the inheritance of adult plant resistance (APR) to leaf rust in six common wheat varieties. The Australian varieties ‘Cranbrook’ and ‘Harrier’ each carry two genes for APR to leaf rust. These genes are genetically independent of the seedling resistance genes Lr23 and Lrl7b, carried by the respective varieties. Adult plant resistance in ‘Suneca’ was conferred by at least two genes, in addition to the seedling genes Lr1 and Lrli. It is likely that the APRs in ‘Cranbrook’, ‘Harrier’ and ‘Suneca’ are conferred by uncharacterized gene(s). Tests of allelism confirmed that seedling resistances in the varieties ‘Avocet R’, ‘Hereward’, ‘Moulin’ and ‘Pastiche’ are conferred by Lrli. Adult plant resistance in the variety ‘Hereward’ was inherited monogenically, whereas varieties ‘Moulin’ and ‘Pastiche’ each carried two dominant genes. On the basis of rust specificity and pedigree analysis, it would seem likely that the APR genes in ‘Hereward’, ‘Moulin’ and ‘Pastiche’ are also currently uncharacterized.

show abstract

Genetics of resistance to Puccinia graminis tritici and Puccinia recondita tritici in Kenya Plume wheat

Cited by 15 publications

References 6 publications

The Emergence of Ug99 Races of the Stem Rust Fungus is a Threat to World Wheat Production

The Emergence of Ug99 Races of the Stem Rust Fungus is a Threat to World Wheat Production

Current status, likely migration and strategies to mitigate the threat to wheat production from rzace Ug99 (TTKS) of stem rust pathogen.

Inheritance of seedling and adult plant resistance to leaf rust of selected Australian spring and English winter wheat varieties

Contact Info

Product

Resources

About