UV-B胁迫下植物的生理适应及分子应答

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Physiological adaptations and molecular responses of plantsunder UV-B stress

ZHANG Fei1LIYingzhu2DUPengfei1BAI Shiqie1YANJiajun1 （ Schoolof Life Scienceand Engineering，Southwest UniversityofScienceand Technology，Mianyang 62101o，China； 2Sichuan Academe of Grassland Sciences， Chengdu 611731， China）

AbstractAsan abiotic stress factor，UV-B radiation significantly impacts plant morphological development， physiological and biochemical processes，and molecular mechanisms.This paper reviewed the regulatory efects of UVBradiationonplant morphology（e.g.，inhibitionofstem elongation，reductioninleaf area，andalterationof rot-toshootratio），aswellas its direct or indirect damage tocell membrane stability，osmoticregulation substances （e.g， soluble sugars，proline），antioxidant defense systems （enzyme activities such as SOD，CAT，APX，and non-enzymatic antioxidants），andphotosyntheticsystems.Plantsenhancetheiradaptabilityto UV-B stress through molecular mechanisms such as synthesizing secondary metabolites like flavonoids and anthocyanins，activating the UVR8- mediated signaling pathway，andactivating hormoneregulationandsecondary metabolicgenes.Furthermore，combined stressfrom UV-B and other environmental factors （e.g.，tmperature，drought，heavy metals）often exhibits synergisticor antagonistic efects，with complex mechanisms varying across species.Current research primarily focuses on crops and herbaceous plants under controlled experimental conditions.Future studies should integrate multi-omics technologies andlong-term fieldobservations to deeplyunravelthe molecular networksand ecological adaptabilityof plants in response to UV-B radiation，providing insights for stress-resistantbreeding and ecological restoration.

KeywordsUV-B radiation； morphological development； physiological response； adaptation mechanism

UV-B辐射是一种影响植物生长发育和环境适应的非生物胁迫因子，在植物的分子遗传、生理生化和表型性状水平上引起一系列复杂的变化。（剩余17055字）