Physiological responses of Phalaenopsis leaves to low temperature stress
In order to study the physiological characteristics of three typical Phalaenopsis spp. varieties (cold-tolerant variety Hunyan, cold-susceptible variety Jubao, medium cold-tolerant variety ZD-1) under low temperature stress, the activities of catalase (CAT), superoxide dismutase (SOD) and ascorbate...
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| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Zhejiang University Press
2011-09-01
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| Series: | 浙江大学学报. 农业与生命科学版 |
| Subjects: | |
| Online Access: | https://www.academax.com/doi/10.3785/j.issn.1008-9209.2011.05.006 |
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| Summary: | In order to study the physiological characteristics of three typical Phalaenopsis spp. varieties (cold-tolerant variety Hunyan, cold-susceptible variety Jubao, medium cold-tolerant variety ZD-1) under low temperature stress, the activities of catalase (CAT), superoxide dismutase (SOD) and ascorbate peroxidase (APX), relative electrical conductivity, soluble sugar and malondialdehyde (MDA) contents in leaves of Phalaenopsis spp. were determined at 10 ℃, 5 ℃, 0℃ for 12, 24, 48 h after pretreatment. The results showed that the relative electrical conductivity and MDA contents in leaves were enhanced along with the increase of low temperature stress. Therefore, these two physiological indexes could be used as identification indexes of cold tolerance for Phalaenopsis plant. No obvious changes of soluble sugar contents were detected. The activities of CAT and SOD increased from 12 h to 24 h and decreased from 24 h to 48 h at all low temperature treatments. The activity of APX consistently increased with the increase of stress degree. The activity of APX could also be used as an identification index of cold tolerance. It was found that the variety Hunyan with good tolerance to low temperature possessed self-protection mechanism through enzyme defense systems, while the susceptible variety Jubao had low protection ability to cold stress. |
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| ISSN: | 1008-9209 2097-5155 |