铜锌复合胁迫对8种观赏草种子萌发特性及幼苗生长的影响

Effects of Copper and Zinc Combined Stress on Seed Germination and Seedling Growth of 8 Ornamental Grasses

为探究观赏草萌发期对铜锌复合胁迫的耐性,以8种观赏草为试验材料,采用水培法,研究不同质量浓度处理对观赏草萌发期生长发育的影响及品种间的差异性.结果表明,随着胁迫质量浓度的升高,8种观赏草种子的发芽率、发芽势、发芽指数、活力指数、胚芽长、胚根长和幼苗鲜质量均呈逐渐下降的趋势,且与胁迫质量浓度呈极显著负相关,Cu2+500 mg/L、Zn2+800 mg/L处理观赏草受到的抑制作用最大.不同的品种之间存在较大差异,总体表现为4种狼尾草属观赏草较4种芒属观赏草的耐性强.通过隶属函数法对供试观赏草的耐铜锌性进行综合评析,种子萌发期耐受性强弱依次为小兔子狼尾草>紫叶狼尾草>大布尼狼尾草>金红羽狼尾草>细叶芒>花叶芒>晨光芒>斑叶芒.

In order to explore the tolerance to copper-zinc combined stress in the germination stage of ornamental grass,8 ornamental grasses were used as experimental materials,and the hydroponic method was used as the test method.The effects of different concentrations of stress on the growth and development of the test materials during germination and the differences among the varieties were studied.The results showed that with the increase of stress concentration,the germination rate,germination potential,germination index,vigor index,seedling length,root length and seedling fresh weight of 8 species of ornamental grasses showed gradual decline.They had an extremely significant negative correlation with the stress concentration,and the inhibition was the most in Cu 2+500 mg/L and Zn 2+800 mg/L treatment.There were large differences among different varieties,and the overall performance was that the 4 species of Pennisetum ornamental grasses were more tolerant than the 4 species of Miscanthus ornamental grasses.Through comprehensive evaluation and analysis by subordination function method,the tolerance was in the order of P.alopecuroides cv.‘Little Bunny’>P.setaceum‘Rubrum’>P.orientale‘Tall tails’>P.setaceum>M.sinensis‘Gracillimus’>M.sinensis‘Variegatus’>M.sinensis‘Morning Light’>M.sinensis‘Zebrinus’.