低Ca对拟南芥幼苗生长及盐胁迫影响初探

Effect of Calcium Deficiency on the Growth of Arabidopsis Seedling and Salt Stress Resistance

以模式植物拟南芥为研究材料,探讨了Ca在拟南芥根生长发育及抵御盐胁迫过程中的重要生理作用。结果表明,低Ca条件会导致拟南芥幼苗鲜质量降低、抑制主根生长、侧根发育及根毛发育与生长。研究发现,50 mmol/L NaCl胁迫会导致对照培养植物产生1个细胞质Ca2+([Ca2+]cyt)升高峰值,为0.325μmol/L;而低Ca培养植物产生3个[Ca2+]cyt升高值,升高频率明显增多,最高达0.467μmol/L,是对照的1.40倍。由此推断,低Ca条件使植物对盐胁迫更敏感。

We choose Arabidopsis as material. The research studies on the important physiology role of calcium in root development and resistance to salt stress. In this study,the fresh weight,primary root,lateral roots and root hairs of Arabidopsis thaliana were all inhibited on the calcium deprivation media. The plants grown on control media were evoked a transient rise of cytosolic Ca^2 ＋（ [Ca^2 ＋]cyt） by 50 mmol/L NaCl,while the plants grown on calcium deprivation media were evoked three. The peaks of signal were 0. 325,0. 476 μmol / L,respectively. It is suggested the plants were more sensitive to salt stress under the calcium deprivation condition.