凹土对甘薯植株生长和生理代谢的影响

Effects of Attapulgite Clay on Growth and Physiological Metabolism of Sweetpotato

通过盆栽试验研究在盐、干旱胁迫下外施凹土对甘薯幼苗生长和生理代谢的影响。在200 mmol/L Na Cl胁迫、干旱胁迫处理下,外施凹土添加到土壤中能够显著增强甘薯的耐盐性和抗旱性;酶活性测定结果显示,外施凹土显著增加盐、干旱胁迫下超氧化物歧化酶(SOD)、过氧化氢酶(CAT)、抗坏血酸过氧化物酶(APX)和过氧化酶(POD)的活性;物质含量测定结果显示,在盐、干旱胁迫下外施凹土显著增加甘薯的脯氨酸、相对水、可溶性糖和叶绿素的含量,显著降低丙二醛(MDA)和过氧化氢(H_2O_2)的含量。结果表明,凹土可以缓解盐、干旱胁迫对甘薯造成的伤害,从而增强甘薯植株的耐盐性和抗旱性。

Culture pot experiment was used to study the effects of attapulgite clay（ AC） on growth and physiological metabolism of sweetpotato. In this paper,AC applied into the soil can significantly enhance salt and drought tolerance of sweetpotato under 200 mmol/L Na Cl and drought stresses. Enzymatic analyses indicated that the activities of superoxide dismutase,catalase,ascorbate peroxidase and peroxidase were significantly increased in sweetpotato plants grown in the soil with applied AC under salt and drought stresses. Further analyses under salt and drought stresses showed significant increases of proline,relative water,soluble sugar and chlorophyll content in sweetpotato plants. Meanwhile,the contents of malonaldehyde and H2 O2 were significantly decreased. These results demonstrate that the applied AC can alleviate damage on sweetpotato plants caused by salt and drought stresses,leading to the enhanced salt tolerance and drought tolerance of sweetpotato plants.