scholarly journals Strategic use of Iranian bread wheat landrace accessions for genetic improvement: Core set formulation and validation

2020 ◽  
Author(s):  
Prashant Vikram ◽  
Jorge Franco ◽  
Juan Burgueño ◽  
Huihui Li ◽  
Deepmala Sehgal ◽  
...  
Keyword(s):  
Bread Wheat ◽  
Genetic Improvement ◽  
Wheat Landrace ◽  
Core Set ◽  
Landrace Accessions

Identification of Winter Habit Bread Wheat Landraces in the National Small Grains Collection with Resistance to Emerging Stem Rust Pathogen Variants

Plant Disease ◽  
2021 ◽  
Author(s):  
Tyler Gordon ◽  
Yue Jin ◽  
Samuel Gale ◽  
Matthew Rouse ◽  
Samuel Stoxen ◽  
...  
Keyword(s):  
Bread Wheat ◽  
Resistance Genes ◽  
Stem Rust ◽  
Rust Resistance ◽  
Stem Rust Resistance ◽  
Field Nursery ◽  
Small Grains ◽  
Stem Rust Resistance Genes ◽  
Landrace Accessions ◽  
Rust Resistance Genes

Wheat stem rust caused by Puccinia graminis f. sp. tritici (Pgt) is a widespread and recurring threat to wheat production. Emerging Pgt variants are rapidly overcoming major gene resistance deployed in wheat cultivars and new sources of race-nonspecific resistance are urgently needed. The National Small Grains Collection (NSGC) contains thousands of wheat landrace accessions that may harbor unique and broadly effective sources of resistance to emerging Pgt variants. All NSGC available facultative and winter-habit bread wheat landraces were tested in a field nursery in St. Paul, MN against a bulk collection of six common U.S. Pgt races. Infection response and severity data were collected on 9,192 landrace accessions at the soft-dough stage and resistant accessions were derived from single spikes. Derived accessions were tested in St. Paul a second time to confirm resistance and in a field nursery in Njoro, Kenya against emerging races of Pgt with virulence to many known resistance genes including Sr24, Sr31, Sr38, and SrTmp. Accessions resistant in the St. Paul field were also tested at the seedling stage with up to 13 Pgt races, including TTKSK and TKTTF, and with 19 molecular markers linked with known stem rust resistance genes or genes associated with modern breeding practices. Forty-five accessions were resistant in both U.S. and Kenya field nurseries and lacked alleles linked with known stem rust resistance genes. Accessions with either moderate or strong resistance in the U.S. and Kenya field nurseries and with novel seedling resistance will be prioritized for further study.

Genetic improvement in bread wheat (Triticum aestivum) yield in Argentina

1989 ◽  
Vol 21 (3-4) ◽  
pp. 289-296 ◽  
Author(s):  
Gustavo A. Slafer ◽  
Fernando H. Andrade
Keyword(s):  
Triticum Aestivum ◽  
Bread Wheat ◽  
Genetic Improvement

Estimates of relative yield potential and genetic improvement of wheat cultivars in the Mediterranean region

2009 ◽  
Vol 147 (3) ◽  
pp. 323-332 ◽  
Author(s):  
O. SENER ◽  
M. ARSLAN ◽  
Y. SOYSAL ◽  
M. ERAYMAN
Keyword(s):  
Grain Yield ◽  
Bread Wheat ◽  
Genetic Improvement ◽  
Mediterranean Region ◽  
Block Design ◽  
Wheat Yield ◽  
Relative Yield ◽  
Yield Potential ◽  
Wheat Cultivars ◽  
The Mediterranean

SUMMARYInformation about changes associated with advances in crop productivity is essential for understanding yield-limiting factors and developing new strategies for future breeding programmes. National bread wheat (Triticum aestivum L.) yields in Turkey have risen by an average of 20·8 kg/ha/year from 1925 to 2006. Annual gain in yield attributable to agronomic and genetic improvement averaged c. 11·6 kg/ha/year prior to 1975, but is now averaging c. 15·1 kg/ha/year. In the Mediterranean region, however, the wheat yield trend line (10·9 kg/ha/year) is c. 0·38 lower than that of Turkey. In order to understand whether such a trend was due to the cultivars released over the years, 16 bread wheat cultivars, commonly grown in the region and representing 23 years of breeding, introduction and selection (from 1976 to 1999), were grown in a randomized complete block design with three replicates across 2 years. Data were collected on maturation time, plant height, spike length, spikelet number/spike, grain number/spike, grain weight/spike, 1000 seed weight, harvest index and grain yield. None of the measured plant traits showed any historical cultivar patterns; therefore, the increase in grain yield could not be attributed to a single yield component. Several physiological traits changed during two decades of cultivar releases in the Mediterranean region that led to a genetic gain in grain yield of about 0·5% per year. Years of data and the present field study in the Mediterranean region suggested that the genetic improvement in wheat seemed inadequate and should be reinforced with modern agricultural management practices as well as technological innovations.

Genetic improvement of bread wheat (Triticum aestivum L.) in Argentina: relationships between nitrogen and dry matter

Euphytica ◽  
1990 ◽  
Vol 50 (1) ◽  
pp. 63-71 ◽  
Author(s):  
Gustavo A. Slafer ◽  
Fernando H. Andrade ◽  
Sergio E. Feingold
Keyword(s):  
Triticum Aestivum ◽  
Bread Wheat ◽  
Genetic Improvement ◽  
Dry Matter ◽  
Triticum Aestivum L

Isolation and Characterization of A Novel Glu-Bx HMW-GS Allele from Tibet Bread Wheat Landrace

2008 ◽  
Vol 4 (1) ◽  
pp. 38-45 ◽  
Author(s):  
Zehong Yan ◽  
Shoufen Dai ◽  
Dengcai Liu ◽  
Yuming Wei ◽  
Jirui Wang ◽  
...  
Keyword(s):  
Bread Wheat ◽  
Wheat Landrace ◽  
Isolation And Characterization

scholarly journals Characterization of resistance to the wheat stem sawfly in spring wheat landrace accessions from targeted geographic regions of the world

Euphytica ◽  
2017 ◽  
Vol 213 (7) ◽  
Author(s):  
Andrea C. Varella ◽  
David K. Weaver ◽  
Jason P. Cook ◽  
Nancy K. Blake ◽  
Megan L. Hofland ◽  
...  
Keyword(s):  
Spring Wheat ◽  
Wheat Stem Sawfly ◽  
Wheat Landrace ◽  
The World ◽  
Geographic Regions ◽  
Landrace Accessions

GENETIC IMPROVEMENT ASSESSMENT OF MORPHO-PHYSIOLOGICAL AND YIELD CHARACTERS IN M3 MUTANTS OF BREAD WHEAT

2018 ◽  
Vol 3 (1) ◽  
pp. 29-45
Author(s):  
H.A. Awaad ◽  
Z.M.A. Attia ◽  
K. S. Abdel- lateif ◽  
M.A. Gomaa ◽  
Ghada M. Sh.M. Abaza
Keyword(s):  
Bread Wheat ◽  
Genetic Improvement ◽  
Improvement Assessment
Sign in / Sign up

Export Citation Format

Share Document