Author:
Araus J.L.,Amaro T.,Casadesús J.,Asbati A.,Nachit M.M.
Abstract
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.
Subject
Plant Science,Agronomy and Crop Science
Cited by
124 articles.
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