| Root morphology and antioxidant enzyme activity of Pugionium cornutum (L.) Gaertn under drought stress |
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| DOI：10.7606/j.issn.1000-7601.2016.03.25 |
| Key Words: Pugionium cornutum seedlings root drought stress activity of antioxidant enzymes root activity osmotic regulation substances root morphology index |
| Author Name | Affiliation | | ZHANG Xi-li | College of Agronomy, Inner Mongolia Agricultural University, Inner Mongolia Autonomous Region Key Laboratory of Wild Peculiar Vegetable Germplasm Resource and Germplasm Enhancement, Huhhot, Inner Mongolia 010019, China | | WANG Ping | College of Agronomy, Inner Mongolia Agricultural University, Inner Mongolia Autonomous Region Key Laboratory of Wild Peculiar Vegetable Germplasm Resource and Germplasm Enhancement, Huhhot, Inner Mongolia 010019, China | | SHI Lei | College of Agronomy, Inner Mongolia Agricultural University, Inner Mongolia Autonomous Region Key Laboratory of Wild Peculiar Vegetable Germplasm Resource and Germplasm Enhancement, Huhhot, Inner Mongolia 010019, China | | YANG Jing | College of Agronomy, Inner Mongolia Agricultural University, Inner Mongolia Autonomous Region Key Laboratory of Wild Peculiar Vegetable Germplasm Resource and Germplasm Enhancement, Huhhot, Inner Mongolia 010019, China |
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| Abstract: |
| Root tissues of annual Pugionium cornutum seedlings under drought stress were used in a pot experiment to investigate the effect of soil water on root morphological characteristics, osmotic regulation substances content, antioxidant enzymes activity and other physiological indexes of seedling root by different drought treatments. The results showed that drought stress increased roots taproot length, root volume and root cap ratio of Pugionium cornutum seedlings with the extension of stress days, which under serve stress were elevated by 154.39%, 90.69% and 189.59%, respectively. Root soluble proteins, proline and soluble sugar content were increased under mild and moderate stresses, whereas went down by 1.65%, 4.13% and 11.84% under severe stress, respectively. Additionally, seedling root activity was dropped by 51.22% under severe stress. While the stress levels went up, malondialdehyde (MDA) content and root plasma membrane permeability gradually rose to 255.74% and 122.78%, respectively. Peroxidase (POD), superoxide dismutase (SOD) and ascorbic acid contents in root became increased under mild and moderate stresses, but were reduced under severe one. Three days after rewatering, the antioxidative defense system and the osmotic regulation substances in Pugionium cornutum seedlings root under the m
ild and moderate water stress could quickly return to control levels, but these indexes under severe stress could only be recovered to the mild stress level, indicating that Pugionium cornutum seedlings roots were seriously damaged. |
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