Selection for Reduced Carbon Isotope Discrimination Increases Aerial Biomass and Grain Yield of Rainfed Bread Wheat

Crop Science ◽  
2002 ◽  
Vol 42 (3) ◽  
pp. 739 ◽  
Author(s):  
G. J. Rebetzke ◽  
A. G. Condon ◽  
R. A. Richards ◽  
G. D. Farquhar
Keyword(s):  
Grain Yield ◽  
Carbon Isotope ◽  
Bread Wheat ◽  
Carbon Isotope Discrimination ◽  
Isotope Discrimination ◽  
Selection For

Relationship of grain yield with carbon isotope discrimination and ash content in lines derived from a bread wheat cultivar

2005 ◽  
Vol 143 (4) ◽  
pp. 275-282 ◽  
Author(s):  
J. T. TSIALTAS ◽  
I. S. TOKATLIDIS ◽  
E. TAMOUTSIDIS ◽  
I. XYNIAS
Keyword(s):  
Grain Yield ◽  
Carbon Isotope ◽  
Bread Wheat ◽  
Carbon Isotope Discrimination ◽  
Selection Criterion ◽  
Ash Content ◽  
Individual Plant ◽  
Low Density ◽  
Isotope Discrimination ◽  
Relationship Of

The objective was to explore, in lines derived from a bread wheat (Triticum aestivum L.) cultivar, the association of grain yield with carbon isotope discrimination (Δ) and ash content (Ash) determined in both flag leaf and kernel. Divergent selection within the cv. Nestos, based on individual plant yield under very low density (11547 plants/ha), produced 20 lines. Progeny evaluation was conducted in two sites of Northern Hellas (Greece) at both low (11547 plants/ha) and high (5000000 plants/ha) density. The results showed significant differences between lines for grain yield, Δ and Ash. However, only the conclusions on grain yield were similar in low and high density, perhaps because the selection criterion under low density was grain yield. This, combined with the lack of any strong relationship of grain yield with either Δ or Ash, failed to confirm the usefulness of these physiological traits as indirect selection criteria, when the within-cultivar variation for grain yield is exploited. The possible association of grain yield with Δ and Ash appeared to be influenced by various factors such as drought, level of grain yield and altitude. Results also showed that less plant-to-plant variability, as expressed by the coefficients of variation (CV) of single-plant yields, was associated with decreased drought response and higher yield stability. The less stressed lines were those that used water more conservatively till anthesis and maintained a high photosynthetic rate during grain filling.

Relationship between grain yield and carbon isotope discrimination in bread wheat under four water regimes

2005 ◽  
Vol 22 (2) ◽  
pp. 231-242 ◽  
Author(s):  
Philippe Monneveux ◽  
Matthew P. Reynolds ◽  
Richard Trethowan ◽  
Hector González-Santoyo ◽  
Roberto J. Peña ◽  
...  
Keyword(s):  
Grain Yield ◽  
Carbon Isotope ◽  
Bread Wheat ◽  
Carbon Isotope Discrimination ◽  
Isotope Discrimination ◽  
Water Regimes

Relations of carbon isotope discrimination and other physiological traits to yield in common bean (Phaseolus vulgaris) under rainfed conditions

1994 ◽  
Vol 122 (2) ◽  
pp. 275-284 ◽  
Author(s):  
J. W. White ◽  
J. A. Castillo ◽  
J. R. Ehleringer ◽  
J. A. C. Garcia ◽  
S. P. Singh
Keyword(s):  
Phaseolus Vulgaris ◽  
Carbon Isotope ◽  
Water Deficit ◽  
Seed Yield ◽  
Combining Ability ◽  
Carbon Isotope Discrimination ◽  
Isotope Discrimination ◽  
Rainfed Conditions ◽  
Mechanisms Of Adaptation ◽  
Selection For

SUMMARYAlthough direct selection for seed yield under water deficit can result in genetic gains in the common bean (Phaseolus vulgaris L.), progress could be enhanced through selection for additional traits that are related to underlying mechanisms of adaptation to water deficit. Carbon isotope discrimination (Δ) has received considerable attention as an indicator of water use efficiency and adaptation to water deficit. To test the utility of Δ as a selection criterion, Δ and other traits were measured in F2 and F3 generations of a nine-parent diallel grown under rainfed conditions at two locations in Colombia with contrasting soil types. An irrigated trial was also conducted at one location. Significant (P 0·05) differences among parents, F2 and F3 were found for carbon isotope discrimination (Δ), leaf optical density (OD), leaf nitrogen (N) and potassium (K) concentrations, relative duration of pod-filling period (RDPF), shoot dry weight (SDW) and harvest index (HI). Effect of location and water regime and their interactions with genotype were also frequently significant. Heritability estimates, determined by regressing the F3 on the F2, ranged from 0·11±011 (S.E.) to 0·33 ±0·10 for OD, 0·22 ± 0·07 to 0·44±0·09 for N, 0·04±0·05 to 0·29±0·08 for K, 0·40 ± 0·08 to 0·43 ± 0·15 for RDPF and 0·30±0·22 to 1·00±0·24 for SDW. All values for Δ and HI did not differ significantly from zero. Correlations between seed yield and OD and RDPF were negative, whereas those with N, K, SDW, and HI were positive. For all traits, mean square values for general combining ability (GCA) were usuall significant and larger than those for specific combining ability (SCA). All significant GCA effects for Δ for ‘Rio Tibagi’, ‘San Cristobal 83’ and ‘Apetito’ were negative, while those for ‘Bayo Rio Grande’, ‘Bayo Criollo del Llano’, ‘Durango 222’ and BAT1224 were positive. Although Δappears unsuitable as an indirect criterion for selection for yield under water deficit, further study of genotypes exhibiting contrasting values of A might reveal differences in mechanisms of adaptation to water deficits, thus leading to other selection criteria or identification of valuable parental lines.

Carbon Isotope Discrimination as a Surrogate of Grain Yield in Drought Stressed Triticale

2017 ◽  
pp. 603-615 ◽  
Author(s):  
Lawrence Munjonji ◽  
Kingsley Kwabena Ayisi ◽  
Bram Vandewalle ◽  
Geert Haesaert ◽  
Pascal Boeckx
Keyword(s):  
Grain Yield ◽  
Carbon Isotope ◽  
Carbon Isotope Discrimination ◽  
Isotope Discrimination

Stability of Carbon Isotope Discrimination and Grain Yield in Durum Wheat

Crop Science ◽  
2001 ◽  
Vol 41 (3) ◽  
pp. 677-681 ◽  
Author(s):  
O. Merah ◽  
E. Deléens ◽  
I. Souyris ◽  
M. Nachit ◽  
P. Monneveux
Keyword(s):  
Grain Yield ◽  
Durum Wheat ◽  
Carbon Isotope ◽  
Carbon Isotope Discrimination ◽  
Isotope Discrimination
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