YIELD PERFORMANCE AND STABILITY OF NEW BREAD WHEAT LINE

Powdery mildew, caused by Blumeria graminis (syn. Erysiphe graminis) f. sp. tritici, is an important disease of bread wheat (Triticum aestivum) in many countries. The CIMMYT bread wheat line Saar has exhibited a high level of partial resistance to powdery mildew in field trials conducted in Europe, Asia, and South America, and represents a valuable source of resistance in wheat breeding. A set of 114 random F5 inbred lines from the cross Saar × Avocet-YrA (susceptible) were evaluated in replicated field trials at two locations in southeastern Norway to determine the number of genes involved in partial resistance to powdery mildew. Narrow-sense heritability estimates were high (0.83 to 0.92). Based on both quantitative and qualitative genetic analyses, the minimum number of genes with additive effects segregating for powdery mildew resistance in the population was four. Transgressive segregation indicated that Avocet-YrA might have contributed one minor gene for resistance. It is concluded that partial resistance to powdery mildew in Saar is controlled by at least three genes. Such resistance conferred by multiple genes having additive effects is expected to be durable.

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Genetic Analysis of Fusarium Head Blight Resistance in CIMMYT Bread Wheat Line C615 Using Traditional and Conditional QTL Mapping

Frontiers in Plant Science ◽

10.3389/fpls.2018.00573 ◽

2018 ◽

Vol 9 ◽

Cited By ~ 23

Author(s):

Xin Yi ◽

Jingye Cheng ◽

Zhengning Jiang ◽

Wenjing Hu ◽

Tongde Bie ◽

...

Keyword(s):

Genetic Analysis ◽

Qtl Mapping ◽

Fusarium Head Blight ◽

Bread Wheat ◽

Fusarium Head Blight Resistance ◽

Blight Resistance ◽

Wheat Line ◽

Head Blight ◽

Conditional Qtl ◽

Conditional Qtl Mapping

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Photoperiod sensitivity affects flowering duration in wheat

The Journal of Agricultural Science ◽

10.1017/s0021859616000125 ◽

2016 ◽

Vol 155 (1) ◽

pp. 32-43 ◽

Cited By ~ 5

Author(s):

H. E. JONES ◽

M. LUKAC ◽

B. BRAK ◽

M. MARTINEZ-EIXARCH ◽

A. ALHOMEDHI ◽

...

Keyword(s):

Bread Wheat ◽

Plant Architecture ◽

Field Experiments ◽

Strong Relationship ◽

Photoperiod Sensitivity ◽

Pleiotropic Effects ◽

Wheat Line ◽

Wheat Varieties ◽

Flowering Duration

SUMMARYFlowering and successful pollination in wheat are key determinants of both quantity and quality of grain. Bread wheat line ‘Paragon’, introgressed with single or multiple daylength insensitivity alleles was used to dissect the effects on the timing and duration of flowering within a hierarchical plant architecture. Flowering of wheat plants was observed in a series of pot-based and field experiments. Ppd-D1a was the most potent known allele affecting the timing of flowering, requiring the least thermal time to flowering across all experiments. The duration of flowering for individual lines was dominated by the shift in the start of flowering in later tillers and the number of tillers per plant, rather than variation in flowering duration of individual spikes. There was a strong relationship between flowering duration and the start of flowering with the earliest lines flowering for the longest. The greatest flowering overlap between tillers was recorded for the Ppd-1b. Across all lines, a warmer environment significantly reduced the duration of flowering and the influence of Ppd-1a alleles on the start of flowering. These findings provide evidence of pleiotropic effects of the Ppd-1a alleles, and have direct implications for breeding for increased stress resilient wheat varieties.

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