Comparative performance of carbon isotope discrimination and canopy temperature depression as predictors of genotype differences in durum wheat yield in Spain

2002 ◽  
Vol 53 (5) ◽  
pp. 561 ◽  
Author(s):  
C. Royo ◽  
D. Villegas ◽  
L. F. García del Moral ◽  
S. Elhani ◽  
N. Aparicio ◽  
...  
Keyword(s):  
Durum Wheat ◽  
Carbon Isotope ◽  
Carbon Isotope Discrimination ◽  
Canopy Temperature ◽  
Total Carbon ◽  
Total Carbon Content ◽  
Isotope Discrimination ◽  
Canopy Temperature Depression ◽  
Wide Range ◽  
Temperature Depression

The relationships between carbon isotope discrimination (Δ) in mature kernels, canopy temperature depression (CTD) during anthesis and grain filling, 1000-kernel weight (TKW), total carbon content of mature kernels, and yield were studied in durum wheat (Triticum turgidum L. var. durum) grown in Spain (western Mediterranean basin). Twenty-five durum wheat genotypes were grown in 2 regions (NE and SE Spain) and under 2 water regimes (rainfed v. support irrigation) from 1997 to 1999 (i.e. a total of 12 trials). Principal component analysis placed yield and Δ on the same axis. Pearson’s correlation and stepwise analysis confirmed that Δ was the trait that best assessed genotype differences in yield within trials, and was followed, at a considerable distance, by TKW. Our results also demonstrated the extremely poor performance of CTD throughout the wide range of growing conditions in this study.

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

scholarly journals Ash content might predict carbon isotope discrimination and grain yield in durum wheat

2001 ◽  
Vol 149 (2) ◽  
pp. 275-282 ◽  
Author(s):  
Othmane Merah ◽  
Eliane Deléens ◽  
Irenée Souyris ◽  
Philippe Monneveux
Keyword(s):  
Grain Yield ◽  
Durum Wheat ◽  
Carbon Isotope ◽  
Carbon Isotope Discrimination ◽  
Ash Content ◽  
Isotope Discrimination

Short-Term Measurements of Carbon Isotope Discrimination in Several C4 Species

1992 ◽  
Vol 19 (3) ◽  
pp. 263 ◽  
Author(s):  
SA Henderson ◽  
SV Caemmerer ◽  
GD Farquhar
Keyword(s):  
Carbon Isotope ◽  
Carbon Isotope Discrimination ◽  
Isotope Composition ◽  
Leaf Gas Exchange ◽  
Short Term ◽  
Isotope Discrimination ◽  
C4 Species ◽  
Linear Relationships ◽  
Partial Pressures ◽  
Wide Range

Carbon isotope discrimination (Δ) and leaf gas-exchange were measured simultaneously for a number of C4 species. Linear relationships were found between A and the ratio of intercellular to ambient partial pressures of CO2, pI/pa. These data were used to estimate the fraction of CO2 released by C4-acid decarboxylation in the bundle sheath, which subsequently leaks out to the mesophyll. We define this fraction as the leakiness of the system and it is also a measure of the extent to which phosphoenolpyruvate (PEP) carboxylations exceed ribulose 1,5-bisphosphate (RuBP) carboxylations. For Sorghum bicolor and Amaranthus edulis, leakiness was estimated at 0.2 and was constant over a wide range of irradiances (between 480 and 1600 μmol quanta m-2 s-1), intercellular CO2 pressures (between 30 and 350 μbar) and leaf temperatures (from 21�C to 34�C). At irradiances less than 240 μmol quanta m-2 s-1, leakiness appeared to increase. For a number of dicotyledonous and monocotyledonous species, of the various C4-decarboxylation types, leakiness was also estimated at 0.2. Contrary to expectation, amongst the 11 species examined, those with suberised lamellae did not show lower values of leakiness than those without suberised lamellae. For one NAD-ME and one PCK monocot, the estimates of leakiness were significantly higher at 0.30 and 0.25, respectively. Long-term discrimination (assessed from carbon isotope composition of leaf dry matter) did not correlate well with these short- term measures of discrimination. We suggest that this may be due to differences between species in fractionations occurring after photosynthesis.

Environmental Factors Determining Carbon Isotope Discrimination and Yield in Durum Wheat under Mediterranean Conditions

Crop Science ◽  
2003 ◽  
Vol 43 (1) ◽  
pp. 170 ◽  
Author(s):  
J. L. Araus ◽  
D. Villegas ◽  
N. Aparicio ◽  
L. F. García del Moral ◽  
S. El Hani ◽  
...  
Keyword(s):  
Environmental Factors ◽  
Durum Wheat ◽  
Carbon Isotope ◽  
Carbon Isotope Discrimination ◽  
Isotope Discrimination ◽  
Mediterranean Conditions

Relationships between ash content, carbon isotope discrimination and yield in durum wheat

1998 ◽  
Vol 25 (7) ◽  
pp. 835 ◽  
Author(s):  
J.L. Araus ◽  
T. Amaro ◽  
J. Casadesús ◽  
A. Asbati ◽  
M.M. Nachit
Keyword(s):  
Grain Yield ◽  
Durum Wheat ◽  
Carbon Isotope ◽  
Carbon Isotope Discrimination ◽  
Flag Leaf ◽  
Dry Mass ◽  
Ash Content ◽  
The Other ◽  
Isotope Discrimination ◽  
Mass Basis

The relationships between ash content, carbon isotope discrimination and yield were studied in durum wheat (Triticum durum Desf.) grown in a Mediterranean region (north-western Syria) under three different water regimes (hereafter referred to as environments). Ash content (on dry mass basis) was measured in the flag leaf about 3 weeks after anthesis (leaf ash) and in mature kernels (kernel ash), whereas Δ was analysed in the penultimate leaf at heading (leaf Δ) and in mature kernels (kernel Δ). Leaf Δ was weakly or not related with the other parameters. Leaf ash correlated positively with kernel Δ (P≤0.001), even in the driest environment, which gave a mean yield of 1.5 t ha-1. For the four parameters, correlations with yield remained significant (P≤0.001) after correcting for days to heading. All the parameters showed a higher broad-sense heritability than yield. The parameter that showed the best genetic correlation with grain yield was kernel ash (r2= 0.88), followed by kernel Δ (r2 = 0.69) and leaf ash (r2 = 0.64), whereas leaf Δ (r2 = 0.26) was the least correlated parameter. Except for kernel ash, these parameters always correlated positively with grain yield. The negative relationships of kernel ash (on dry mass basis) with yield and all the other parameters may be attributable to the finding that kernel ash was higher in those genotypes more affected by drought during grain filling. Thus, kernel ash was negatively related (P≤0.001) with total kernel mass per spike. Prediction of grain yield through multiple linear regression suggests that kernel ash can be used as complementary criterion to either kernel Δ or leaf ash.

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