Registration of Four Synthetic Hexaploid Wheat (<i>Triticum turgidum/Aegilops tauschii</i>) Germplasm Lines Tolerant to Waterlogging

Villareal, R. L.; Sayre, Kenneth D.; Bañuelos, O.; Mujeeb‐Kazi, A.

doi:10.2135/cropsci2001.411274x

Cited by 46 publications

(23 citation statements)

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“…In the early 1990s, the synthetic hexaploid wheats were backcrossed to many CIMMYT and global elite breeding lines. CIMMYT's synthetics introduced new variation for morphological and agronomic traits, (Villareal et al, 1994a, b); resistance to biotic stresses (Kema et al, 1995, Lage et al, 2002, 2004Ma et al, 1995;Mujeeb-Kazi et al, 2001;Cox, 1998) and abiotic stresses Trethowan et al, 2005, Villareal et al, 2001. The synthetics were subsequently also shown to be very diverse at the molecular level, and genetically distinct from cultivated wheats (Villareal et al, 1994b;Zhang et al, 2005).…”

Section: Resultsmentioning

confidence: 99%

Bringing wild relatives back into the family: recovering genetic diversity in CIMMYT improved wheat germplasm

et al. 2006

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Section: Resultsmentioning

confidence: 99%

Bringing wild relatives back into the family: recovering genetic diversity in CIMMYT improved wheat germplasm

et al. 2006

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“…In addition, diversity for other useful traits such as improved zinc efficiency (Cakmak et al 1999;Genc and McDonald 2004), salt tolerance (Gorham 1990;Kazi 1993), cold tolerance (Limin and Fowler 1993), waterlogging tolerance (Villareal et al 2001), pre-harvest sprouting (Trethowan et al 1998;Gatford et al 2002), increased level of iron concentration in grain (Trethowan 2006), end-use quality (William et al 1993;Peña et al 1995), yield components (Villareal et al 1994a(Villareal et al , 1994bLage et al 2006), increased photosynthetic rate (Blanco et al 2000), and improved performance under dry conditions Gororo et al 2002) has been found in SHW. However, to assess the value of SHW it is necessary to examine its use in and effect on applied wheat breeding.…”

Section: Table 1 List Of Locations That Reported Data For Semi-arid mentioning

confidence: 99%

CIMMYT's use of synthetic hexaploid wheat in breeding for adaptation to rainfed environments globally.

Lage

Trethowan

2008

Aust. J. Agric. Res.

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The International Maize and Wheat Improvement Center (CIMMYT) has had significant impact on wheat production in rainfed regions of the developing world. During the last decade, yield potential has increased in drought-prone areas partly due to the use of synthetic hexaploid wheat (SHW), produced through interspecific hybridisation of Triticum turgidum spp. and Aegilops tauschii, followed by chromosome doubling. The objectives of this study were to document the use of SHW in wheat breeding at CIMMYT and quantify its potential effect on global wheat adaptation. The first SHWderived lines targetted at rainfed conditions appeared in the 5th Semi-Arid Wheat Yield Trial (SAWYT) representing 8% of the lines, increasing to 46% by the 15th SAWYT. During the same period the average coefficient of parentage of SHW in all synthetically derived crosses decreased from 75 to 19%. Average yield rank of genotypes across locations and years was used as a performance indicator of the SHW-derived lines in SAWYT 5-12. In the 5th SAWYT the average rank of the SHW-derived lines was 30 (out of 50) increasing to 25 by the 12th SAWYT. SAWYT 11 was the first trial to include SHWderived lines bred exclusively for rainfed environments, using directed selection for drought tolerance. International trial data from SAWYT 11 and 12 showed that the SHW-derived line Vorobey was a top-performing line. Vorobey performed well across all environments compared with the best locally adapted check cultivar at each location; trial means ranged from 1 to 8 t/ha. To further exploit genetic diversity for adaptation to drought, SHW has been produced using emmer wheat (T. turgidum L. subsp. dicoccon) as the tetraploid parent. Yield trial data from Mexico show that SHW derivatives based on emmer wheat improved yield performance under drought compared with their drought-tolerant recurrent parents. The use of SHW in wheat breeding for rainfed environments at CIMMYT has increased significantly over the past 10-15 years and the performance and effect of the derived lines have improved with time.

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“…2001, Gupta et al. 2001, Villareal et al. 2001) and affecting quality parameters such as grain protein (Triboï et al.…”

Section: Introductionmentioning

confidence: 99%

Effects of Post‐Anthesis Drought and Waterlogging on Accumulation of High‐Molecular‐Weight Glutenin Subunits and Glutenin Macropolymers Content in Wheat Grain

Jiang

Yue

Wollenweber

et al. 2009

J Agronomy Crop Science

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Drought and flooding during grain filling have become major constraints to wheat quality and yield. The impacts of water deficits and waterlogging during the grain filling on contents of high‐molecular‐weight glutenin subunits (HMW‐GS) and of glutenin macropolymers (GMP) in grains of the winter wheat cultivar Yumai 34 with high grain protein content (GPC) and Yangmai 9 with low GPC were studied. At maturity, GPC was higher under drought and lower under waterlogging compared to the control, while contents of GMP and HMW‐GS were reduced by the two water‐stress treatments. The contents of both HMW‐GS and GMP were higher in Yumai 34 than in Yangmai 9. A drought event after anthesis increased the accumulation of HMW‐GS during the early grain filling stage. By contrast, waterlogging reduced the accumulation of HMW‐GS during the whole grain filling phase. At maturity, the HMW‐GS and GMP to protein ratios were also depressed under the two water‐stress events, while the HMW‐GS to GMP ratio was very close between the three treatments in Yumai 34 and much higher under the control than the drought and waterlogging treaments in Yangmai 9. It is concluded that the variation in GMP content with various water‐stress treatments is attributed to the changing in accumulation of HMW‐GS in the grain.

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Registration of Four Synthetic Hexaploid Wheat (Triticum turgidum/Aegilops tauschii) Germplasm Lines Tolerant to Waterlogging

Cited by 46 publications

References 1 publication

Bringing wild relatives back into the family: recovering genetic diversity in CIMMYT improved wheat germplasm

Bringing wild relatives back into the family: recovering genetic diversity in CIMMYT improved wheat germplasm

CIMMYT's use of synthetic hexaploid wheat in breeding for adaptation to rainfed environments globally.

Effects of Post‐Anthesis Drought and Waterlogging on Accumulation of High‐Molecular‐Weight Glutenin Subunits and Glutenin Macropolymers Content in Wheat Grain

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