Accumulation dynamics of dry matter, oil and major fatty acids in sunflower seeds in relation to genotipe and water regime
Academic Article
Publication Date:
2003
abstract:
Water availability is one of the agronomic
factors that can influence the production and
quality of sunflower oil. For this reason, a trial was
done in southern Italy to study the effects of different
water regimes (0, 33, 67 and 100% of ETm
replacement) on dry matter and oil accumulation in
the seed of a standard and an oleic sunflower
hybrid.
METHODS. The changes in dry matter, oil and major
fatty acids in the seeds were defined by functional
analysis and calculating their accumulation rates.
RESULTS. Dry matter, oil and oleic acid contents were
higher in the three irrigated treatments than the rainfed
one. The irrigated treatments differed only at the
intermediate ripening phase, with values increasing
from the most stressed treatment to that better supplied.
Differences in the accumulation rate of linoleic
acid were less marked. The intermediate water
regimes, independently of genotype, determined a
more marked intensity of initial increase but also the
sharpest decrease. In comparison, the initial seed
growth levels of the two extreme treatments were
more than halved and the most sustained accumulation
rate was measured in the intermediate seed filling
phase. The accumulation rate of oil and oleic acid
was similar to that of the dry matter, while that of
linoleic acid clearly differed. The variability in dry
matter and oil accumulation caused by genotype was
fairly insignificant in comparison to that of water
regime. Variations on the oleic acid accumulation determined
by the two studied factors were instead,
similar, whereas genotype was the most important
source of variation for linoleic acid.
CONCLUSION. The trial provided useful results to add
to the basic knowledge on the subject. The interaction
effect between the two studied factors on the
content of the two major fatty acids also gives the
possibility of being able to programme, within determined
limits, the quality of the raw material intended
for industry.
factors that can influence the production and
quality of sunflower oil. For this reason, a trial was
done in southern Italy to study the effects of different
water regimes (0, 33, 67 and 100% of ETm
replacement) on dry matter and oil accumulation in
the seed of a standard and an oleic sunflower
hybrid.
METHODS. The changes in dry matter, oil and major
fatty acids in the seeds were defined by functional
analysis and calculating their accumulation rates.
RESULTS. Dry matter, oil and oleic acid contents were
higher in the three irrigated treatments than the rainfed
one. The irrigated treatments differed only at the
intermediate ripening phase, with values increasing
from the most stressed treatment to that better supplied.
Differences in the accumulation rate of linoleic
acid were less marked. The intermediate water
regimes, independently of genotype, determined a
more marked intensity of initial increase but also the
sharpest decrease. In comparison, the initial seed
growth levels of the two extreme treatments were
more than halved and the most sustained accumulation
rate was measured in the intermediate seed filling
phase. The accumulation rate of oil and oleic acid
was similar to that of the dry matter, while that of
linoleic acid clearly differed. The variability in dry
matter and oil accumulation caused by genotype was
fairly insignificant in comparison to that of water
regime. Variations on the oleic acid accumulation determined
by the two studied factors were instead,
similar, whereas genotype was the most important
source of variation for linoleic acid.
CONCLUSION. The trial provided useful results to add
to the basic knowledge on the subject. The interaction
effect between the two studied factors on the
content of the two major fatty acids also gives the
possibility of being able to programme, within determined
limits, the quality of the raw material intended
for industry.
Iris type:
1.1 Articolo in rivista
Keywords:
achene; dry matter; fatty acid; oil; sunflower; water regime
List of contributors:
Santonoceto, Carmelo; Anastasi, U.; Riggi, E. E ABBATE V.
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