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Physiological Response of Cycas multipinnata to High Temperature and PEG Treatments(PDF)

《北方园艺》[ISSN:1001-0009/CN:23-1247/S]

Issue:
2017年17
Page:
104-109
Research Field:
Publishing date:

Info

Title:
Physiological Response of Cycas multipinnata to High Temperature and PEG Treatments
Author(s):
ZHENG Yanling
Key Laboratory of Biodiversity Conservation in Southwest China，State Forestry Administration，Southwest Forestry University，Kunming，Yunnan 650224
Keywords:
Cycas multipinnata; high temperature; PEG treatment
PACS:
-
DOI:
10.11937/bfyy.20170760
Abstract:
To understand the ecological adaptive mechanisms of Cycas multipinnata under stress conditions，leaves collected from adult trees were used to determine the effects of different temperatures (25，35，45，55 ℃) and different concentrations of PEG (0.00，0.05，0.10，0.15，0.20 g?mL-1) on physiological characteristics of C.multipinnata.The results showed that MDA content did not vary significantly among different temperatures；CAT activity of leaves subjected to 45 ℃ was significantly higher than that of leaves subjected to other temperatures;compared to those of leaves subjected to 25 ℃，POD activity decreased and SOD activity increased significantly for leaves that were treated at 35，45，55 ℃；the soluble sugar content of leaves treated at 45 ℃ and 55 ℃ increased significantly，but the proline content of leaves did not vary significantly among temperature treatments.The pigment content and composition，Fv/Fm，MDA content，proline content and antioxidant enzyme (CAT，POD and SOD) activities did not vary significantly among leaves treated at various concentrations of PEG，but the soluble sugar contents of leaves treated at 0.10，0.15 g?mL-1 of PEG were significantly higher than that of leaves treated at other concentrations of PEG.In conclusion，C.multipinnata possessed relatively high tolerance to heat，and soluble sugar and antioxidant enzymes such as CAT and SOD played roles in osmotic adjustment and resistence of oxidative stress under high temperatures.The physiological process of C.multipinnata was not significantly affected by the tested concentrations of PEG which might suggest the relatively high tolerance of the species to drought.

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Last Update: 2017-09-29