INVESTIGADORES
AGUIRREZABAL Luis Adolfo Nazareno
artículos
Título:
Intercepted solar radiation affects oil fatty acid composition in crop species
Autor/es:
IZQUIERDO N.G; AGUIRREZÁBAL L.A.N.; ANDRADE F.H.; GEROUDET, C; PEREYRA IRAOLA, M
Revista:
FIELD CROPS RESEARCH
Editorial:
ELSEVIER SCIENCE BV
Referencias:
Año: 2009 p. 66 - 74
ISSN:
0378-4290
Resumen:
Solar radiation intercepted during grain filling affects growth of grain crops. Its effects on oil fatty acid
composition have not been investigated. The objective of this work was to investigate the effect of
intercepted solar radiation per plant on oil fatty acid composition in four crops. An experiment including
a cultivar of soybean, maize and sunflower was sown at Balcarce, Argentina, during two growing seasons
(200102 and 200405) and two experiments with a rape cultivar were conducted during in 2004 and
2005. The amount of intercepted solar radiation during grain filling was modified by shading (5080%)
and thinning plants (50%). In addition, the same cultivars of soybean andmaize were sown in the field at
Parana´ , Argentina, during the 200405 growing season and in growth chambers under different day/
night temperatures during grain filling. Regardless of the species, oleic acid percentage increased as
intercepted solar radiation (ISR) per plant increased. The highest difference (13%) was observed in
sunflower (shading vs. thinning) and the increase in oleic acid was associated with a reduction in both
linoleic and linolenic acids. Saturated fatty acid percentage was not affected by intercepted solar
radiation per plant. Differences among radiation treatments were observed not only at physiological
maturity but also at earlier stages of the grain filling period. In soybean and maize, increasing daily mean
temperature increased oleic acid percentage (r2 0.52). Changes in fatty acid composition in radiation
experiments and treatments were not accounted for by variations in temperature (differences among
treatments were 1 8C). In sunflower and maize, the source (ISR)sink (grain number) ratio during the
grain filling period better explained changes in oleic acid percentage than per plant ISR alone. Changes in
fatty acid composition due to radiation treatments were as large as variations produced by changes in
temperature in soybean and maize, but not in sunflower. Based on these results, management practices
that increase intercepted radiation by the plant during grain filling could contribute to obtain oils with
higher oleic acid percentage.
grain filling period better explained changes in oleic acid percentage than per plant ISR alone. Changes in
fatty acid composition due to radiation treatments were as large as variations produced by changes in
temperature in soybean and maize, but not in sunflower. Based on these results, management practices
that increase intercepted radiation by the plant during grain filling could contribute to obtain oils with
higher oleic acid percentage.
experiments and treatments were not accounted for by variations in temperature (differences among
treatments were 1 8C). In sunflower and maize, the source (ISR)sink (grain number) ratio during the
grain filling period better explained changes in oleic acid percentage than per plant ISR alone. Changes in
fatty acid composition due to radiation treatments were as large as variations produced by changes in
temperature in soybean and maize, but not in sunflower. Based on these results, management practices
that increase intercepted radiation by the plant during grain filling could contribute to obtain oils with
higher oleic acid percentage.
grain filling period better explained changes in oleic acid percentage than per plant ISR alone. Changes in
fatty acid composition due to radiation treatments were as large as variations produced by changes in
temperature in soybean and maize, but not in sunflower. Based on these results, management practices
that increase intercepted radiation by the plant during grain filling could contribute to obtain oils with
higher oleic acid percentage.
r2 0.52). Changes in fatty acid composition in radiation
experiments and treatments were not accounted for by variations in temperature (differences among
treatments were 1 8C). In sunflower and maize, the source (ISR)sink (grain number) ratio during the
grain filling period better explained changes in oleic acid percentage than per plant ISR alone. Changes in
fatty acid composition due to radiation treatments were as large as variations produced by changes in
temperature in soybean and maize, but not in sunflower. Based on these results, management practices
that increase intercepted radiation by the plant during grain filling could contribute to obtain oils with
higher oleic acid percentage.
grain filling period better explained changes in oleic acid percentage than per plant ISR alone. Changes in
fatty acid composition due to radiation treatments were as large as variations produced by changes in
temperature in soybean and maize, but not in sunflower. Based on these results, management practices
that increase intercepted radiation by the plant during grain filling could contribute to obtain oils with
higher oleic acid percentage.
1 8C). In sunflower and maize, the source (ISR)sink (grain number) ratio during the
grain filling period better explained changes in oleic acid percentage than per plant ISR alone. Changes in
fatty acid composition due to radiation treatments were as large as variations produced by changes in
temperature in soybean and maize, but not in sunflower. Based on these results, management practices
that increase intercepted radiation by the plant during grain filling could contribute to obtain oils with
higher oleic acid percentage.