水杨酸对盐胁迫下百日草种子萌发及幼苗生理特性的影响

doi:10.11686/cyxb2014516

摘要/Abstract

摘要： 以百日草品种“芳菲1号”为试材,在100 mmol/L NaCl胁迫处理下,研究了不同浓度(0, 0.5, 1.0, 1.5和2.0 mmol/L)水杨酸浸种对百日草种子萌发以及不同浓度水杨酸(SA)注根和叶面喷施对幼苗生长及生理特性的影响。结果显示,SA一定程度上可以缓解盐胁迫对百日草种子萌发和幼苗生长的影响。其中,0.5, 1.0, 1.5 mmol/L SA处理的种子具有较高的发芽势、发芽率、发芽指数、活力指数;幼苗株高、茎粗、根冠比增加;叶片叶绿素含量明显升高;超氧化物歧化酶(SOD)、过氧化物酶(POD)活性以及脯氨酸、可溶性糖、可溶性蛋白含量均变高,丙二醛(MDA)含量降低。表明0.5~1.5 mmol/L的SA处理通过促进百日草叶片叶绿素合成,保护其光合作用,维持了植物的正常生长;同时,通过调节百日草抗氧化及抗渗透胁迫能力,有效缓解了盐毒害,尤其以1.0 mmol/L效果最佳,2.0 mmol/L的SA处理未见有明显缓解。

Abstract: Zinnia elegans seed (cultivar “Fangfei No.1”) was treated with 100 mmol/L NaCl. The effects of different concentration of exogenous salicylic acid (SA: 0, 0.5, 1.0, 1.5, and 2.0 mmol/L) on salt stress-injuries were investigated during seed germination and seedling growth. The results indicated that SA can effectively alleviate the injuries of salt stress on seed germination and seedling growth of Z. elegans. Salicylic acid increased germination vigour, germination percentage, germination index, and subsequently increased plant height, stem diameter, root∶shoot ratio, chlorophyll content, proline, soluble sugar and soluble protein content and superoxide dismutase (SOD) and peroxide (POD) activity under salt stress. However, malondialdehyde (MDA) content (indicator of oxidative stress) was decreased by salicylic acid. Salicylic acid concentration of 1.0 mmol/L produced the best effects whereas no mitigation effects were observed on seed germination or seedling growth under salt stress at 2.0 mmol/L salicylic acid. It is suggested that salicylic acid concentrations of 0.5-1.5 mmol/L could be used to alleviate salt stress-induced injuries.

黄玉梅, 张杨雪, 刘庆林, 刘盼, 黄胜岚. 水杨酸对盐胁迫下百日草种子萌发及幼苗生理特性的影响[J]. 草业学报, 2015, 24(7): 97-105.

HUANG Yu-Mei, ZHANG Yang-Xue, LIU Qing-Lin, LIU Pan, HUANG Sheng-Lan. Effects of salicylic acid on seed germination and seedling physiological characteristics of Zinnia elegans under salt stress[J]. Acta Prataculturae Sinica, 2015, 24(7): 97-105.

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