The Physiological Responses of Jiangxi Yanshan Red Bud Taro(Colocasia esculenta L.Schott var.cormosus CV.Hongyayu)Plantlets Under Salt Stress
The physiolo gical responses of Jiangxi Yanshan red bud taro(Colocasia esculenta L.Schott var.cormosus CV.Hongyayu)plantlets under salt stress were studied.The results show that:(1)The lower concentration Na Cl(1 g/L and 2.5 g/L)contributed to the growth and development of plantlets,the fresh weight and dry weight increased significantly and there was no significant effect on root/shoot ratio,while the higher concentration of Na Cl(5 g/L,10 g/L and 15 g/L)inhibited the growth and development of plantlets,fresh weight,dry weight and root/shoot ratio decreased significantly.(2)The lower concentration Na Cl(1 g/L and 2.5 g/L)could increase the content of chlorophyll and soluble protein,improve the activity of SOD and POD.But the higher concentration of Na Cl(5 g/L,10 g/L and 15 g/L) decreased the content of chlorophyll and soluble protein content,decreased the activity of SOD and POD.(3)Na Cl stress at any concentration all increased the Na+and K+content of red bud taro leaves and roots,and the Na+/K+of leaves and roots also increased with the increasing of Na Cl concentration.(4)Na Cl stress at any concentration all increased the content of soluble sugar and proline of red bud taro.Low concentration Na Cl stress did not result in the change of malondialdehyde content and the cytoplasmic membrane permeability of red bud taro tube seedlings leaf,but high concentration Na Cl stress could cause the increase of malondialdehyde content and the cytoplasmic membrane permeability of red bud taro tube seedlings leaf.Thecontent of p roline showed significant positive correlation with the content of soluble sugar and MDA and the membrane permeability,which showed that the accumulative content of proline could reflect the hurt degree of red bud taro plantlet.