两种栽培荞麦对日光UV-B辐射的响应

两种荞麦(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。

Responses of Two Cultivated Buckwheat Subspecies to Solar UV-B Radiation

The common and tartary buckwheat were grown in the sheltered field plots under reduced,near-ambient and supplemental ultraviolet-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 rutin 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 cultivars in the high-ambient UV-B region besides considering the high-yield potential.