Epichloë gansuensis Enhances Achnatherum inebrians Seedlings Growth and Antioxidant Capacity Under UV-B Stress
2025
Cuiling Wan | Xiuzhang Li | Qian Shi
Strong UV-B radiation is one of the main climatic characteristics of the Qinghai&ndash:Tibet Plateau. Plants grown on the Tibetan Plateau are exposed to high-intensity UV radiation and therefore require effective mechanisms to adapt to these stresses. However, little attention has been paid to the response of grass&ndash:endophytic fungi symbiosis to UV-B radiation in this area. In this study, we investigated the relationship between Epichloë: gansuensis and the growth and antioxidant responses of Achnatherum inebrians seedlings exposed to different UV-B doses, aiming to evaluate the growth and antioxidant capacity of A. inebrians seedlings under UV-B stress. The plant height, tillers, biomass, electrical conductivity, soluble sugars, malondialdehyde (MDA), proline, hydrogen peroxide (H2O2), superoxide dismutase (SOD), polyphenol oxidase (POD), and catalase (CAT) of A. inebrians seedlings were determined under different intensities of UV-B radiation treatments. The results showed that, with the increase in UV-B radiation intensity, the plant height, tiller and biomass of A. inebrians seedlings showed a decreasing trend, the electrical conductivity increased, malondialdehyde content increased, soluble sugar and proline content decreased, SOD, POD, and CAT activities showed a decreasing trend, and the content of H2O2 increased, which means that the UV-B radiation was able to inhibit the morphogenesis and aggravate the membrane lipid peroxidation of A. inebrians seedlings. The tolerance of the A. inebrians&ndash:E. gansuensis symbiont to UV-B may enable it to have a high infection rate on the Qinghai&ndash:Tibet Plateau.
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