Adverse Effect of H₂O₂ Change on Morphology, Mitochondrial Membrane Permeability and Antioxidant Enzyme in Root of <em>Dianthus Chinensis</em> L. under Salt Stress

Abstract

Dianthus chinensis L. is a salt-tolerant ornamental plant. Root is the first and critical part of plant to encounter soli salinity. In order to elucidate H 2 O 2 impact on root morphology and mitochondrial permeability transition as well as activities of antioxidant enzymes in root of Dianthus chinensis L., we treated seedling with H 2 O 2 and DMTU under NaCl. The results revealed that change of H 2 O 2 level under NaCl would negatively influence the root growth, as well as lower the value of mitochodrial membrane absorbance at 540 nm and the ratio of Cyt c/a. Meanwhile, SOD and POD under NaCl plus H 2 O 2 and NaCl plus DMTU were far lower than those under NaCl alone.