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Grain yield and quality of wheat under increased ultraviolet radiation (UV-B) at later stages of the crop cycle

Published online by Cambridge University Press:  06 September 2007

D. F. CALDERINI ,
X. C. LIZANA ,
S. HESS ,
C. R. JOBET  and
J. A. ZÚÑIGA
D. F. CALDERINI*
Affiliation:
Instituto de Producción y Sanidad Vegetal, Universidad Austral de Chile, Campus Isla Teja, Valdivia, Chile
X. C. LIZANA
Affiliation:
Instituto de Producción y Sanidad Vegetal, Universidad Austral de Chile, Campus Isla Teja, Valdivia, Chile Escuela de Graduados, Facultad de Ciencias Agrarias, Universidad Austral de Chile, Campus Isla Teja, Valdivia, Chile
S. HESS
Affiliation:
Instituto de Química, Universidad Austral de Chile, Campus Isla Teja, Valdivia, Chile
C. R. JOBET
Affiliation:
INIA Carillanca, Km 10 Camino Cajón, Vilcún. IX Región, Chile
J. A. ZÚÑIGA
Affiliation:
INIA Carillanca, Km 10 Camino Cajón, Vilcún. IX Región, Chile
*
*To whom all correspondence should be addressed. E-mail: danielcalderini@uach.cl
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Summary

The increase of ultraviolet (UV-B) radiation could be a challenge for wheat production systems in Southern Chile, as in other areas. Previous reports have shown that increased UV-B radiation decreases wheat yield by affecting both grain number and grain weight. However, contrasting results have also been published showing no effect on wheat biomass and grain yield. In addition, little is known about the effect of higher UV-B radiation at particular periods of the crop cycle on grain quality traits. The objective of the present study was to evaluate grain yield, yield components and grain quality in response to increased UV-B radiation during key periods of yield component determination. Two experiments were carried out under field conditions in the Universidad Austral de Chile (latitude 39°62′S). Two spring wheat cultivars were exposed to two periods of supplemented UV-B radiation (280–320 nm): (i) between booting and anthesis, c. 20 days, and (ii) from 10 days after anthesis until physiological maturity, c. 40 days. Ultraviolet radiation was increased to levels of 3·8 and 4·9 kJ/m2/day in experimental years 1 and 2, respectively, by using UV-B lamps. At harvest, plants were sampled to quantify aboveground biomass, grain yield, grain number and average grain weight. In addition, protein and gluten concentration of grains were measured. Grain yield was not affected (P>0·05) by the UV-B increase at pre- or at post-anthesis treatments. Similar results were found for each yield component. In addition, grain protein and gluten concentration showed similar values in the increased UV-B and control treatments. Therefore, if increases in UV-B radiation take place during the latter stages of the crop cycle as is expected, the present results do not support the speculation that increases of UV-B radiation in Southern Chile will compromise wheat production systems.

Type
Crops and Soils
Information
The Journal of Agricultural Science , Volume 146 , Issue 1 , February 2008 , pp. 57 - 64
Copyright
Copyright © Cambridge University Press 2007

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