Evaluation of a Collection of Wild Wheat Relative Aegilops Geniculata Roth and Identification of Potential Sources for Useful Traits

Zaharieva, M.; Monneveux, P.; Henry, M.; Rivoal, Roger; Valkoun, J.; Nachit, M. M.

doi:10.1007/978-94-017-3674-9_99

Cited by 28 publications

(24 citation statements)

References 9 publications

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“…In this regard Ae. tauschii appeared to be the most desirable species as many desirable genes for biotic and abiotic resistance were found its accessions (Mujeeb-Kazi and Hettell 1995;Zaharieva et al, 2001). Using this D-genome diversity International center for maize and wheat improvement (CIMMYT) resynthesized the hexaploid wheat by crossing elite durum lines with Ae.…”

Section: Discussionmentioning

confidence: 99%

Assessment of D-genome Based Genetic Diversity in Drought Tolerant Wheat Germplasm

Faheem¹,

Mahmood²,

Shabbir³

et al. 2015

IJAB

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The complex nature of drought stress is one of the key bottlenecks in wheat improvement. Besides conventional breeding approaches for wheat improvement under water deficit conditions use of wild relatives like Aegilops tauschii (DD), as a source of rich genetic variation has significantly triggered the process. In this study, we have assessed the D-genome based genetic diversity in drought tolerant germplasm by using SSR markers. A total number of 178 alleles were detected on 49 loci with an average of 3.49 alleles per locus with the highest number being of 10 alleles for marker gwm515-2D. Genetic diversity explained by these SSR makers ranged from 4 to 67% with an average of 56.2% per marker. There were 23 SSR markers, which revealed PIC (Polymorphism Information Content) values of more than 50% while overall the PIC values for all markers ranged from 8 to 63.2% with an average of 48.1%. Clustering of genotypes D41, D43, D44, D50 and D51 within two well-known drought tolerant cultivars viz. Dharwar Dry and Sitta showed the suitability of these genotypes for water deficit areas. In conclusion, the genetic diversity present in the studied germplasm may be used in wheat breeding programs targeted for the drought tolerance especially in arid/semi-arid (rain-fed) environments.

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Section: Discussionmentioning

confidence: 99%

Assessment of D-genome Based Genetic Diversity in Drought Tolerant Wheat Germplasm

Faheem¹,

Mahmood²,

Shabbir³

et al. 2015

IJAB

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“…Although most genetic variation governing plant-insect interactions is probably polygenic (eg, Kliebenstein et al, 2002b), single genes responsible for plant resistance have been documented in several instances. For example, in the interaction between wheat and the hessian fly, Mayetiola destructor, resistance is governed by single genes, and a variety of resistance polymorphisms are found in cultivars and wild relatives of wheat (Zaharieva et al, 2001). Likewise, resistance to Asian rice gall midge is controlled by a single dominant locus (Katiyar et al, 2001).…”

Section: Resistance To Pathogens and Herbivoresmentioning

confidence: 99%

Evolution of plant resistance at the molecular level: ecological context of species interactions

Meaux

Mitchell-Olds

2003

Heredity

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Molecular data regarding the diversity of plant loci involved in resistance to herbivores or pathogens are becoming increasingly available. These genes demonstrate variable patterns of diversity, suggesting that they differ in their evolutionary history. In parallel, the study of natural variation for resistance, generally conducted at the phenotypic level, has shown that resistance does not evolve solely under selection pressures exerted by enemies. Metapopulation dynamics and other ecological characteristics of interacting species also appear to have a large impact on resistance evolution. Until now, studies of resistance at the molecular level have been conducted separately from ecological studies in extant populations. Future progress requires an evolutionary approach integrating both molecular and ecological aspects of resistance evolution. Such an approach will contribute greatly to our understanding of the evolution of molecular diversity at loci involved in biotic stress.

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“…Ae. geniculata is native to the Balkans, Mediterranean region, Russia, and Near East (Kimber and Feldman 1987) and is an important source of resistance to diseases and pests (Gill et al 1985;Zaharieva et al 2001a;Schneider et al 2008); salt tolerance (Siddiqui and Yosufzai 1988); drought and heat adaption (Zaharieva et al 2001b); and high grain protein content, high iron and zinc content, and early maturity (Rawat et al 2009). A complete set of wheat-Ae.…”

Section: Introductionmentioning

confidence: 98%

Discovery and molecular mapping of a new gene conferring resistance to stem rust, Sr53, derived from Aegilops geniculata and characterization of spontaneous translocation stocks with reduced alien chromatin

et al. 2011

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This study reports the discovery and molecular mapping of a resistance gene effective against stem rust races RKQQC and TTKSK (Ug99) derived from Aegilops geniculata (2n = 4x = 28, U(g)U(g)M(g)M(g)). Two populations from the crosses TA5599 (T5DL-5M(g)L·5M(g)S)/TA3809 (ph1b mutant in Chinese Spring background) and TA5599/Lakin were developed and used for genetic mapping to identify markers linked to the resistance gene. Further molecular and cytogenetic characterization resulted in the identification of nine spontaneous recombinants with shortened Ae. geniculata segments. Three of the wheat-Ae. geniculata recombinants (U6154-124, U6154-128, and U6200-113) are interstitial translocations (T5DS·5DL-5M(g)L-5DL), with 20-30% proximal segments of 5M(g)L translocated to 5DL; the other six are recombinants (T5DL-5M(g)L·5M(g)S) have shortened segments of 5M(g)L with fraction lengths (FL) of 0.32-0.45 compared with FL 0.55 for the 5M(g)L segment in the original translocation donor, TA5599. Recombinants U6200-64, U6200-117, and U6154-124 carry the stem rust resistance gene Sr53 with the same infection type as TA5599, the resistance gene donor. All recombinants were confirmed to be genetically compensating on the basis of genomic in situ hybridization and molecular marker analysis with chromosome 5D- and 5M(g)-specific SSR/STS-PCR markers. These recombinants between wheat and Ae. geniculata will provide another source for wheat stem rust resistance breeding and for physical mapping of the resistance locus and crossover hot spots between wheat chromosome 5D and chromosome 5M(g)L of Ae. geniculata.

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Evaluation of a Collection of Wild Wheat Relative Aegilops Geniculata Roth and Identification of Potential Sources for Useful Traits

Cited by 28 publications

References 9 publications

Assessment of D-genome Based Genetic Diversity in Drought Tolerant Wheat Germplasm

Assessment of D-genome Based Genetic Diversity in Drought Tolerant Wheat Germplasm

Evolution of plant resistance at the molecular level: ecological context of species interactions

Discovery and molecular mapping of a new gene conferring resistance to stem rust, Sr53, derived from Aegilops geniculata and characterization of spontaneous translocation stocks with reduced alien chromatin

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