Latitudinal variation in ambient UV-B radiation is an important determinant of Lolium perenne forage production, quality, and digestibility.
Latitudinal variation in ambient UV-B radiation is an important determinant of Lolium perenne forage production, quality, and digestibility.
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DOI：
10.1093/jxb/ert077
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发表时间：
2013-05
影响因子：
6.9
通讯作者：
Gwynn-Jones D
中科院分区：
文献类型：
--
作者：
Comont D;Winters A;Gomez LD;McQueen-Mason SJ;Gwynn-Jones D
到目前为止，很少有研究考虑在农业上重要的牧草对UV-B辐射的反应。然而，多年生黑麦草等草本植物的电流分布很广，这代表着暴露在环境UV-B的显著变化中。本研究对多年生乳杆菌L.perenne(cv.)AberDart)到模拟的UV-B照射的纬度梯度，代表在模拟北纬70、60、50、40和30°N的生物有效UV-B剂量。对生长、可溶性化合物和消化率进行了评估，并讨论了UV-B对牧草特性的影响以及对牲畜和生物乙醇生产的影响。生物加权UV-B每增加1kJ m-2天，地上生物量产量就减少约12.67%。结果，在最高UV-B处理下生长的植物的总生物量仅为对照的13.7%。所有UV-B处理都使总黄酮类化合物增加了约76%，而羟基肉桂酸则随着UV-B剂量的增加而增加。相反，UV-B辐射降低了地上生物量的消化率和可溶性果糖的浓度，但可溶性蔗糖、葡萄糖和果糖的浓度没有受到影响。这些结果突显了UV-B直接影响饲草生产力和化学物质的能力，对消化和生物乙醇生产产生负面影响。这些结果强调了多年生黑麦草品种未来发展和分布中考虑UV-B辐射的必要性。
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.