Latitudinal variation In ambient UV-B radiation is an important determinant of Lolium perenne forage production, quality, and digestibility

David Charles Comont, Ana Louise Winters, Leonardo D Gomez, Simon J. McQueen-Mason, Dylan Gwynn-Jones

Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

16 Dyfyniadau(SciVal)
13 Wedi eu Llwytho i Lawr (Pure)

Crynodeb

Few studies to date have considered the responses of agriculturally important forage grasses to UV-B radiation. Yet grasses such as Lolium perenne have a wide current distribution, representing exposure to a significant variation in ambient UV-B. The current study investigated the responses of L. perenne (cv. AberDart) to a simulated latitudinal gradient of UV-B exposure, representing biologically effective UV-B doses at simulated 70, 60, 50, 40, and 30° N latitudes. Aspects of growth, soluble compounds, and digestibility were assessed, and results are discussed in relation to UV-B effects on forage properties and the implications for livestock and bio-ethanol production. Aboveground biomass production was reduced by approximately 12.67% with every 1 kJ m–2 day–1 increase in biologically weighted UV-B. As a result, plants grown in the highest UV-B treatment had a total biomass of just 13.7% of controls. Total flavonoids were increased by approximately 76% by all UV-B treatments, while hydroxycinnamic acids increased in proportion to the UV-B dose. Conversely, the digestibility of the aboveground biomass and concentrations of soluble fructans were reduced by UV-B exposure, although soluble sucrose, glucose, and fructose concentrations were unaffected. These results highlight the capacity for UV-B to directly affect forage productivity and chemistry, with negative consequences for digestibility and bioethanol production. Results emphasize the need for future development and distribution of L. perenne varieties to take UV-B irradiance into consideration.
Iaith wreiddiolSaesneg
Tudalennau (o-i)2193-2204
Nifer y tudalennau12
CyfnodolynJournal of Experimental Botany
Cyfrol64
Rhif cyhoeddi8
Dyddiad ar-lein cynnar11 Ebr 2013
Dynodwyr Gwrthrych Digidol (DOIs)
StatwsCyhoeddwyd - Mai 2013

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