Mavrič Čermelj Anja, Golob Aleksandra, Vogel-Mikuš Katarina, Germ Mateja
Biotechnical Faculty, University of Ljubljana, Jamnikarjeva ulica 101, 1000 Ljubljana, Slovenia.
Jozef Stefan Institut, Jamova 39, 1000 Ljubljana, Slovenia.
Plants (Basel). 2021 Dec 28;11(1):91. doi: 10.3390/plants11010091.
Due to climate change, plants are being more adversely affected by heatwaves, floods, droughts, and increased temperatures and UV radiation. This review focuses on enhanced UV-B radiation and drought, and mitigation of their adverse effects through silicon addition. Studies on UV-B stress and addition of silicon or silicon nanoparticles have been reported for crop plants including rice, wheat, and soybean. These have shown that addition of silicon to plants under UV-B radiation stress increases the contents of chlorophyll, soluble sugars, anthocyanins, flavonoids, and UV-absorbing and antioxidant compounds. Silicon also affects photosynthesis rate, proline content, metal toxicity, and lipid peroxidation. Drought is a stress factor that affects normal plant growth and development. It has been frequently reported that silicon can reduce stress caused by different abiotic factors, including drought. For example, under drought stress, silicon increases ascorbate peroxidase activity, total soluble sugars content, relative water content, and photosynthetic rate. Silicon also decreases peroxidase, catalase, and superoxide dismutase activities, and malondialdehyde content. The effects of silicon on drought and concurrently UV-B stressed plants has not yet been studied in detail, but initial studies show some stress mitigation by silicon.
由于气候变化，植物正受到热浪、洪水、干旱以及气温和紫外线辐射增加的更不利影响。本综述聚焦于增强的UV-B辐射和干旱，以及通过添加硅来减轻它们的不利影响。关于UV-B胁迫以及添加硅或硅纳米颗粒对包括水稻、小麦和大豆在内的农作物的影响已有研究报道。这些研究表明，在UV-B辐射胁迫下向植物添加硅会增加叶绿素、可溶性糖、花青素、类黄酮以及紫外线吸收和抗氧化化合物的含量。硅还会影响光合速率、脯氨酸含量、金属毒性和脂质过氧化。干旱是影响植物正常生长发育的胁迫因素。经常有报道称硅可以减轻包括干旱在内的不同非生物因素造成的胁迫。例如，在干旱胁迫下，硅会增加抗坏血酸过氧化物酶活性、总可溶性糖含量、相对含水量和光合速率。硅还会降低过氧化物酶、过氧化氢酶和超氧化物歧化酶的活性以及丙二醛含量。硅对干旱以及同时受到UV-B胁迫的植物的影响尚未得到详细研究，但初步研究表明硅有一定的减轻胁迫作用。
