不同浓度的硅处理对老芒麦苗期抗寒性的影响
王若非 , 李昕哲 , 李祺策 , 张嘉仪 , 王焙钧 , 谢文刚
草业学报 ›› 2026, Vol. 35 ›› Issue (01) : 130 -139.
不同浓度的硅处理对老芒麦苗期抗寒性的影响
Effects of different concentrations of silicon on the cold resistance of Elymus sibiricus seedlings
本研究以老芒麦为材料,旨在评估不同浓度(0、50、100、150和200 mg·L-1)纳米硅处理对其苗期抗寒性的影响。通过低温胁迫试验和纳米硅处理,发现在低温胁迫下纳米硅处理显著促进了老芒麦根系的伸长(P<0.05),而对株高无显著影响(P>0.05)。此外,对试验中各指标全面综合分析表明,和对照相比,200 mg·L-1纳米硅处理组老芒麦幼苗的根长、脯氨酸含量、叶绿素含量分别提高了63.2%、178.6%和15.6%,相对电导率、丙二醛含量和脱落酸含量分别降低了17.5%、3.88%和2.23%。综上,纳米硅可通过调节细胞渗透压、维持光合作用效率以及调节植物激素水平等维持植物在低温胁迫下能正常进行生理代谢,以增强植物的抗寒性。本研究为纳米硅在牧草抗寒育种中的应用提供了理论支撑。
In this study, we evaluated the effects of nano-silicon (nano-Si) at varying concentrations (0, 50, 100, 150, and 200 mg·L-1) on the cold resistance of Elymus sibiricus during the seedling stage. When seedlings were subjected to a cold treatment, those treated with nano-Si showed significantly enhanced root elongation, compared with that of the control group, but no difference in their plant height. An exhaustive analysis of cold-resistance traits revealed that, compared with the control group, E. sibiricus seedlings treated with 200 mg·L-1 nano-silicon showed markedly higher values for root length, proline content, and chlorophyll content (increased by 63.2%, 178.6%, and 15.6%, respectively), and lower values for several stress-related parameters. Specifically, compared with the control group, the E. sibiricus seedlings treated with 200 mg·L-1 nano-Si had lower relative conductivity, malondialdehyde content, and abscisic acid content (17.5%, 3.88%, and 2.23% lower, respectively). These results indicate that nano-Si regulates cell osmotic pressure, maintains photosynthetic efficiency, and modulates plant hormone levels, thereby preserving physiological metabolism under low-temperature stress and improving cold resistance. The results of this study provide theoretical support for the application of nano-Si to increase the cold resistance of forage crops.
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青海省帅才科学家责任制项目(2023-NK-147)
财政部和农业农村部:国家现代农业产业技术体系,甘肃省首席科学家项目(23ZDKA013)
甘肃省科技重大专项(22ZD6NA007)
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