盐胁迫和干旱胁迫对蓝花子种子萌发和幼苗生长的影响

Effects of NaCl and Mannitol Stress on the Seed Germination and Seedling Growth of Raphanus sativus L.var.raphanistroides Makino

将蓝花子培养在含有不同浓度的NaCl和甘露醇的MS培养基上,研究蓝花子在不同浓度的NaCl和甘露醇处理下的发芽势、发芽率、相对发芽率、叶绿素含量以及过氧化物酶活性等,揭示蓝花子对盐胁迫和干旱胁迫的耐受能力。结果表明:蓝花子的发芽率、株高、根长、叶绿素以及过氧化物酶活性都随NaCl浓度的升高而显著下降;在甘露醇胁迫时,蓝花子幼苗的根长、叶绿素含量以及POD酶活性都随甘露醇浓度的升高表现为先升高后降低的趋势。说明同十字花科其它植物相比蓝花子对盐胁迫十分敏感,而对干旱胁迫却能表现出比较明显的耐受性。

The seeds of Raphanus sativus L. var. raphanistroides Makino were cultured on MS medium containing different concentrations of NaCl and mannitol. After measuring the physiological and biochemical characters such as germination potential,germination rate, relative germination rate, chlorophyll content and POD activity, it was found that the Raphanus sativus L. var. raphanistroides Makino germination rate,plant height,root length,chlorophyll content and POD activity gradually decreased with the increasing of NaC1 concentration. But with the increasing of mannitol concentration, the seeds showed longer root length, higher chlorophyll content and POD activity at lower mannitol concentration, but when the concentration of mannitol increased further, theses physiological and biochemical characters declined again. It seemed that the Raphanus sativus L. var. raphanistroides Makino was more tolerant to drought stress than other species of crueiferae.