PDF(Pubmed)
Abstract：
Seed priming has become a practical pre-sowing strategy to deal with abiotic stresses. This study aims to explore the effects of polyethylene glycol (PEG) priming on seed germination and seedling growth of Scutellaria baicalensis Georgi under salt stress. Regardless of seed priming, salt stress significantly inhibited the seed germination and seedling growth of S. baicalensis. PEG priming significantly alleviates the inhibitory effects of salt stress on seed germination and seedling growth when compared to non-priming and water priming. Among all treatments, PEG priming exhibited the highest germination rate, germination potential, seed vigor index, fresh weight, dry weight, and plant length; the highest contents of proline, soluble sugar, and soluble protein; the highest K+/Na+ ratio and relative water content; the highest antioxidant activities and contents; but the lowest H2O2, malondialdehyde (MDA) content, and relative electrical conductivity in response to salt stress. In addition, PEG priming had the highest transcript levels of antioxidant-related genes among all treatments under NaCl stress. Taken together, the results demonstrated that seed priming with PEG could be recommended as an effective practice to enhance the germination and early seedling growth of S. baicalensis under saline conditions.
摘要：
种子引发已成为应对非生物胁迫的实用播种前策略。本研究旨在探讨聚乙二醇(PEG)引发对盐胁迫下黄芩种子萌发和幼苗生长的影响。不管种子引发如何，盐胁迫显著抑制了黄芩种子萌发和幼苗生长。与非引发和水引发相比，PEG引发显着减轻了盐胁迫对种子萌发和幼苗生长的抑制作用。在所有治疗中，PEG引发表现出最高的发芽率，发芽潜力，种子活力指数，鲜重,干重,和植物长度；脯氨酸含量最高，可溶性糖，K+/Na+比值和相对含水量最高;抗氧化活性和含量最高;但H2O2、丙二醛(MDA)含量最低,和响应盐胁迫的相对电导率。此外,在NaCl胁迫下的所有处理中，PEG引发的抗氧化相关基因的转录水平最高。一起来看,结果表明，在盐碱条件下，用PEG引发种子可作为增强黄芩萌发和幼苗早期生长的有效方法。
