Document Detail

Ecophysiological responses of Abies fabri seedlings to drought stress and nitrogen supply.
MedLine Citation:
PMID:  20230480     Owner:  NLM     Status:  MEDLINE    
Abies fabri (Mast.) Craib. (A. fabri) is an endemic and dominant species in typical subalpine dark coniferous forests distributed in mountainous regions of Western Sichuan, China. We investigated the ecophysiological responses of A. fabri seedlings to short-term experimental drought, nitrogen supply and their interaction. Drought stress was created by excluding natural precipitation with automatically controlled plastic roof that covered the seedlings. Nitrogen fertilization was applied weekly by spraying over seedlings ammonium nitrate solution (50 kg N ha(-1) year(-1)) during the growing season of 2009. The results showed that drought stress decreased leaf relative water content (RWC), whereas it caused marked increases in root mass ratio (RMR) and root/shoot mass ratio by 6.19 and 10.39%, respectively, as compared with the control. Drought stress increased malondialdehyde (MDA) content, electrolyte leakage, proline content, soluble sugars content and the activities of antioxidant enzymes, whereas nitrogen supply decreased MDA content, but enhanced activities of some antioxidant enzymes [especially peroxidase (POD)]. In the drought stressed plots, nitrogen supply increased RWC and decreased the content of MDA. The combination of drought stress and nitrogen supply also decreased the activities of antioxidant enzymes. These results indicated that the negative effects of drought stress on A. fabri seedlings might be alleviated by nitrogen supply.
Jianying Guo; Yan Yang; Genxu Wang; Liudong Yang; Xiangyang Sun
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2010-03-08
Journal Detail:
Title:  Physiologia plantarum     Volume:  139     ISSN:  1399-3054     ISO Abbreviation:  Physiol Plant     Publication Date:  2010 Aug 
Date Detail:
Created Date:  2010-07-15     Completed Date:  2010-10-12     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  1256322     Medline TA:  Physiol Plant     Country:  Denmark    
Other Details:
Languages:  eng     Pagination:  335-47     Citation Subset:  IM    
Key Laboratory of Mountain Environmental Change and Regulation, Chengdu Institute of Mountain Hazards and Environment, The Alpine Ecosystem Observation and Experiment Station of the Gongga Mountain, Chinese Academy of Sciences & Ministry of Water Conservancy, Chengdu 610041, P.R. China.
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MeSH Terms
Abies / enzymology,  physiology*
Antioxidants / metabolism
Carbohydrates / analysis
Cell Membrane Permeability
Hydrogen Peroxide / metabolism
Malondialdehyde / analysis
Nitrogen / metabolism*
Peroxidases / metabolism
Plant Leaves / physiology
Plant Roots / growth & development
Proline / analysis
Seedling / enzymology,  physiology*
Singlet Oxygen / metabolism
Water / physiology
Reg. No./Substance:
0/Antioxidants; 0/Carbohydrates; 147-85-3/Proline; 17778-80-2/Singlet Oxygen; 542-78-9/Malondialdehyde; 7722-84-1/Hydrogen Peroxide; 7727-37-9/Nitrogen; 7732-18-5/Water; EC 1.11.1.-/Peroxidases

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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