Record Display for the EPA National Library Catalog


Main Title Competition, Morphology and Canopy Structure in Wheat ('Triticum aestivum L.') and Wild Oat ('Avena fatua L.') Exposed to Enhanced Ultraviolet-B Radiation.
Author Barnes, P. W. ; Jordan, P. W. ; Gold, W. G. ; Flint, S. D. ; Caldwell, M. M. ;
CORP Author Utah State Univ., Logan. Dept. of Range Science and Ecology Center.;Corvallis Environmental Research Lab., OR.
Publisher c1988
Year Published 1988
Report Number EPA/600/J-88/416;
Stock Number PB90-108317
Additional Subjects Plant anatomy ; Farm crops ; Crop weeds ; Ultraviolet radiation ; Competition ; Field tests ; Greenhouses ; Biomass ; Oat plants ; Wheat plants ; Reprints ; Triticum aestivum ; Avena fatua ; Biological radiation effects
Library Call Number Additional Info Location Last
NTIS  PB90-108317 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 14p
The influence of enhanced ultraviolet-B radiation (UV-B, 280-320nm) on competitive balance in wheat (Triticum aestivum L.) and wild oat (Avena fatua L.) was examined in the field for each of 6 years using replacement series experiments. The relative competitive status of wheat increased significantly under UV-B enhancement in two of the years, when precipitation was relatively high, and over all years when data from all years were combined. Shifts in competitive balance occurred in response to UV-B enhancement despite no significant changes in total shoot biomass in either monocultures or mixtures. Associated with shifts in competitive balance under UV-B treatment in the field and in a glasshouse competition experiment were similar, differential effects of UV-B on species growth form: leaf insertion heights and leaf blade lengths were reduced to a greater extent in wild oat than in wheat in mixtures exposed to enhanced UV-B. These changes in individual plant morphology were related to shifts in foliage height distribution in mixed canopies with wheat overtopping wild oat to a greater degree under UV-B treatment.