中文摘要：

两种养麦（甜荞和苦荞）栽培在不同紫外线B（UV-B）辐射[减弱（-UVB）、近充足（NA，Near—abient）、增强（＋UVB）]保护小区内，以研究当前和未来增强UV．B辐射对其生长、发育、产量、生物量和卢丁含量等的影响。结果表明，不仅未来增强UV—B辐射而且当前高原条件下的UV-B辐射显著抑制了荞麦的生长、降低了产量和生物量积累，但促进了荞麦发育使其开花期提前。另一方面，叶片卢丁和UV吸收化合物在NA和增强UV—B辐射下显著增加，而多酚氧化酶在UV-B辐射下大幅度提高。两种栽培荞麦对UV-B辐射非常敏感，在高紫外辐射地区或未来增强UV-B辐射条件下荞麦生产除应考虑到高产外，还应该考虑到荞麦对紫外线辐射的耐性。

英文摘要：

The common and tartary buckwheat were grown in the sheltered field plots under reduced, near-ambient and supplemental uhraviolet-B radiation （UV-B ,280 -315 nm）. Effects of different UV-B treatments on crop growth, development, rutin content, UV-absorbing compound, peroxidase activity, seed yield and biomass accumulation were determined. The prevailing and increasing UV-B radiation caused negative effect on plant growth, total biomass, final seed yield in both buckwheats, while crop development was promoted by enhanced UV-B radiation. Leaf turin concentration and UV-B absorbing compound were generally increased by UV-B. The results showed that common and tartary buckwheats were potentially UV-B sensitive species, and UV-B tolerance should be considered while introducing and promoting new buckwheat euhivars in the high-ambient UV-B region besides considering the high-yield potential.