Institutional Repository of Xishuangbanna Tropical Botanical Garden
| Contrasting Physiological Responses of Jatropha curcas Plants to Single and Combined Stresses of Salinity and Heat | |
| Silva, E. N. | |
| 2013 | |
| Source Publication | Journal of Plant Growth Regulation
 |
| ISSN | 0721-7595 |
| Volume | 32Issue:1Pages:159-169 |
| Abstract | In this study we evaluated the contrasting major physiological responses of Jatropha curcas L. to salinity alone and in combination with high temperature. The plants were subjected to salinity (100 mM NaCl) before and after exposure to 43 A degrees C (heat stress) for 6 h. The effects of salinity were more harmful than heat stress, and the effects of salt stress were increased when both stress factors were combined. The negative effects of the combined treatments included strong impairment of the CO2 assimilation rate and stomata conductance and increased Na and Cl- accumulation in the leaves associated with increased membrane damage and lipid peroxidation. Heat favorably stimulated the accumulation of glycine betaine and chlorophyll in the salt-stressed leaves. Treatments with salt, heat, and their combination stimulated the antioxidant enzymatic defense system, that is, the expression of ascorbate peroxidase (APX) and superoxide dismutase (SOD), whereas the expression of catalase (CAT) was stimulated through treatments with salt alone and in combination with heat; treatment with heat alone did not affect CAT expression. The ascorbate redox state was decreased under salinity stress alone and in combination with heat but remained unaffected when treated with heat alone. Overall, the leaf H2O2 concentration did not change in response to these stresses, but lipid peroxidation and membrane damage was increased. Moreover, high temperature increases the negative effects of salt stress on key physiological processes, but treatment with heat alone is favorable for several metabolic indicators of young J. curcas plants. In contrast with heat, these plants exhibit higher physiological disturbances under isolated salinity stress. |
| Document Type | 期刊论文 |
| Identifier | https://ir.xtbg.ac.cn/handle/353005/7830 |
| Collection | 热带植物资源可持续利用重点实验室特色文献_小桐子相关文献 |
| Recommended Citation GB/T 7714 | Silva, E. N.. Contrasting Physiological Responses of Jatropha curcas Plants to Single and Combined Stresses of Salinity and Heat[J]. Journal of Plant Growth Regulation,2013,32(1):159-169. |
| APA | Silva, E. N..(2013).Contrasting Physiological Responses of Jatropha curcas Plants to Single and Combined Stresses of Salinity and Heat.Journal of Plant Growth Regulation,32(1),159-169. |
| MLA | Silva, E. N.."Contrasting Physiological Responses of Jatropha curcas Plants to Single and Combined Stresses of Salinity and Heat".Journal of Plant Growth Regulation 32.1(2013):159-169. |
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| Contrasting Physiolo（405KB） | 开放获取 | CC BY-NC-SA | View Download | |||
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