Efficacy of Selection for Grain Yield in the F2 and F4 Generations in Bread Wheat under Irrigation and Drought Conditions = كفاءة الانتخاب لمحصول الحبوب من الجيل الثاني والجيل الرابع في قمح الخبز تحت ظروف الجفاف والري العادي

2017 ◽  
Vol 21 (4) ◽  
pp. 825-842
Author(s):  
Rasha E. Mahdy
Keyword(s):  
Grain Yield ◽  
Bread Wheat ◽  
Drought Conditions ◽  
Selection For

scholarly journals Selection for high spike fertility index increases genetic progress in grain yield and stability in bread wheat

Euphytica ◽  
2018 ◽  
Vol 214 (7) ◽  
Author(s):  
M. P. Alonso ◽  
N. E. Mirabella ◽  
J. S. Panelo ◽  
M. G. Cendoya ◽  
A. C. Pontaroli
Keyword(s):  
Grain Yield ◽  
Bread Wheat ◽  
Genetic Progress ◽  
Fertility Index ◽  
Selection For

Association between canopy reflectance indices and yield and physiological traits in bread wheat under drought and well-irrigated conditions

2004 ◽  
Vol 55 (11) ◽  
pp. 1139 ◽  
Author(s):  
Mario Gutiérrez-Rodríguez ◽  
Matthew Paul Reynolds ◽  
José Alberto Escalante-Estrada ◽  
María Teresa Rodríguez-González
Keyword(s):  
Grain Yield ◽  
Bread Wheat ◽  
Photosynthetic Rate ◽  
Flag Leaf ◽  
Radiation Environment ◽  
Yield Potential ◽  
Canopy Reflectance ◽  
Wheat Genotypes ◽  
Drought Conditions ◽  
The Relationship

Spectral reflectance (SR) indices [NDVI (R900 – R680/R900 + R680); GNDVI (R780 – R550/R780 + R550); and water index, WI (R900/R970)]; and 6 chlorophyll indices (R740/R720, NDI = R750 – R705/R750 + R705, R780 – R710/R780 – R680, R850 – R710/R850 – R680, mND = R750 – R705/R750 + R705 – 2R445, and mSR = R750 – R445/R705 – R445) were measured with a FieldSpec spectroradiometer (Analytical Spectral Devices, Boulder, CO) on bread wheat (Triticum aestivum L.) genotypes adapted to irrigated and drought conditions to establish their relationship with yield in field-grown plots. Bread wheat genotypes from the International Maize and Wheat Improvement Center (CIMMYT) were used for this study in 3 experiments: 8 genotypes in a trial representing historical progress in yield potential, and 3 pairs of near-isolines for Lr19, both of which were grown under well-watered conditions; and the third experiment included 20 drought tolerant advanced genotypes grown under moisture stress. These were grown during the 2000 and 2001 spring cycles in a temperate, high radiation environment in Obregón, NW México. The 9 SR indices were determined during grain filling along with canopy temperature depression (CTD), flag leaf photosynthetic rate, and chlorophyll estimates using a SPAD meter. The relationship of SR indices with grain yield and biomass fitted best with a linear model. NDVI and GNDVI showed positive relationships with grain yield and biomass under well-irrigated conditions (r = 0.35–0.92), whereas NDVI showed a stronger association with yield under drought conditions (r = 0.54). The 6 chlorophyll indices showed significant association with yield and biomass of wheat genotypes grown under well-irrigated conditions (r = 0.39–0.90). The association between chlorophyll indices and chlorophyll estimates was correlated (r = 0.38–0.92), as was the case for photosynthetic rate (r = 0.36–0.75). WI showed a significant relationship with grain yield in wheat genotypes grown under drought stress conditions (r = 0.60) as well as with grain yield and biomass under well-irrigated conditions (r = 0.52–0.91). The relationship between WI and CTD was significant (P ≤ 0.05) in both environments (r = 0.44–0.84). In conclusion, the SR showed potential for identifying higher-yielding genotypes in a breeding program under dry or irrigated conditions, as well as for estimating some physiological parameters.

scholarly journals Direct and Indirect Selection for Grain Yield in Bread Wheat (Triticum aesitivum L.)

2020 ◽  
Vol 11 (3) ◽  
pp. 241-249
Author(s):  
Hassan Fouad ◽  
M. El-Ashmoony ◽  
A. El-Karamity ◽  
M. Sarhan
Keyword(s):  
Grain Yield ◽  
Bread Wheat ◽  
Indirect Selection ◽  
Selection For

Early generation selection for milling quality in five bread wheat crosses

1993 ◽  
Vol 44 (4) ◽  
pp. 633 ◽  
Author(s):  
L O'Brien ◽  
DJ Mares ◽  
FW Ellison
Keyword(s):  
Grain Yield ◽  
Bread Wheat ◽  
Yellow Pigment ◽  
Pigment Content ◽  
Response To Selection ◽  
Early Generation ◽  
Milling Quality ◽  
Early Generation Selection ◽  
Yellow Pigment Content ◽  
Selection For

A milling quality assessment protocol using a 10 g seed sample was developed. Its ability to discriminate between wheats differing in milling quality and its application to early generation selection were evaluated. The procedure reliably and accurately discriminated between the varieties Sunco, Hartog and Sunelg for the flour parameters yellow pigment content, Kent-Jones colour grade and yield. The procedure was applied to progeny of F2 single plant selections from five bread wheat crosses, and heritabilities and simulated response to selection measured in the F3 generation. Medium to high heritabilities were obtained for yellow pigment content and colour grade, while those for flour yield were generally lower and varied considerably between crosses. Results of simulated selection versus values for control varieties indicated that the protocol would result in positive response to selection for milling quality. The outcome for some crosses, however, was influenced by the comparatively high values for the control varieties, whereas the use of a lesser standard gave improved response to selection. The best simulated selection results were obtained from the Suneca/Sunfield cross in which values for both parents exceeded those of the standard (Hartog). However, there was no transgressive segregation for improved milling quality in any cross. Phenotypic correlations between milling parameters and grain yield were generally non-significant indicating that the sequence of trait selection (i.e. grain yield or milling quality) would have minimal influence on the other attribute. The data indicate that response to selection for milling quality would result from application of this protocol to the early generations of a wheat breeding program.

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