Abstract:
KEY MESSAGE:The T.118 and T.406 seedlings showed strong adaptability under Cd concentrations ≤ 50 µM. The mechanisms of photoprotection in T.118 and T.406 differed in high-Cd concentrations. To explore the physiological response characteristics of Taxodium hybrids to cadmium (Cd) stress and provide basis for screening of Cd-tolerant species, the hydroponic cultivation of T.118 and T.406 seedlings was conducted to demonstrate the effects of Cd stress on seedling growth, antioxidant system, and chlorophyll fluorescence parameters. After 35 days of Cd stress at a concentration ≤ 50 µM, the dry weight biomass of the two clones did not significantly differ from that of the control. T.406 exhibited a significant increase in POD activity compared to T.118 and maintained high SOD activity after exposure to high concentrations of Cd, whereas MDA levels showed little changes. Under low-Cd stress, chlorophyll content and fluorescence parameters remained stable, especially for T.406. Under high-Cd concentration stress, the above parameters were lower than the control, with a more significant decrease in T.118 than in T.406. The non-photochemical quenching coefficient (NPQ) of both clones increased with increasing Cd concentration. T.118 showed a greater increase than T.406, particularly under high-Cd concentration stress. The T.118 and T.406 seedlings adapted to low-Cd concentration stress by enhancing their antioxidant enzyme activity to maintain the balance of reactive oxygen metabolism and reduce cellular damage. The photochemical activity of mesophyll cells remained high to maintain photosynthetic capacity and normal seedling growth. T.406 showed stronger resistance to Cd than T.118. T.406 prevented photodamage by promoting the photochemical utilization of the excitation energy and maintaining a strong antioxidant stress ability. Enhancement of heat dissipation capability may be the main photoprotection mechanism of T.118.
journal_name
Plant Cell Repjournal_title
Plant cell reportsauthors
Ma YL,Wang HF,Wang P,Yu CG,Luo SQ,Zhang YF,Xie YFdoi
10.1007/s00299-018-2327-0subject
Has Abstractpub_date
2018-11-01 00:00:00pages
1547-1555issue
11eissn
0721-7714issn
1432-203Xpii
10.1007/s00299-018-2327-0journal_volume
37pub_type
杂志文章abstract::The DNA-binding domain of the yeast transcriptional activator GAL4 was expressed in transgenic tobacco plants in order to attempt to obtain specific repression of reporter genes. Expression of the GUS and the NPTII gene was essentially the same regardless of the presence of a gene encoding a functional GAL4 DNA-bindin...
journal_title:Plant cell reports
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journal_title:Plant cell reports
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journal_title:Plant cell reports
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journal_title:Plant cell reports
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pub_type: 杂志文章
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journal_title:Plant cell reports
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journal_title:Plant cell reports
pub_type: 杂志文章
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journal_title:Plant cell reports
pub_type: 杂志文章
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