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《Chinese Journal of Applied and Environmental Biology》 2015-03
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Effects of drought stress on growth and physiological parameters of Machilus pingii seedlings

LUO Jie;ZHOU Guangliang;HU Tingxing;HU Hongling;CHEN Hong;WANG Qian;HU Yi;WANG Bin;Faculty of Forestry, Sichuan Agricultural University;  
This paper is aimed to determine the drought-resistant characteristics of Machilus pingii seedlings in order to provide theoretical foundation and technical reference for the cultivation and water management of M. pingii seedlings. The study was a pot trial in greenhouse. The continuous drought stress in different duration was classified as different soil water levels: well-watered(CK), mildly stressed(water soil content(SWC): 10-15%), moderately stressed(SWC: 6-10%) and severely stressed(SWC: 6%). The results indicated that:(1) with longer duration of droug ht stress, the SWC, relative leaf water content(LRWC), and the height and basal diameter increment of seedling decreased significantly. Chlorophyll a(Chla), Chlorophyll b(Chlb), carotenoids(Car) contents and Chla/b increased at the beginning and then decreased.(2) Main osmotic adjustment substances including soluble sugar(SS) and soluble protein(SP) contents increased at first, reached the maximum values under moderate drought stress, and declined under severe drought, while proline(Pro) content increased continuously.(3) With higher drought stress intensity, the contents of mlonaldehyde(MDA) and hydrogen peroxide(H2O2) increased slowly under moderate drought stress, and then rose sharply under severe drought stress, which led to aggravation of membrane lipid peroxidation and increase of membrane permeability.(4) The superoxide dismutase(SOD) activity and ascorbic acid(As A) content in leaves were significantly lower in drought-stressed plants compared with well-watered plants, whereas peroxidase(POD) activity initially increased but then declined. By the end of drought stress, POD activity was still 25.5% higher than that of CK. We concluded that under the condition of mild and moderate drought stress(SWC 7.6%) M. pingii seedlings can adjust the protective enzyme system and osmotic adjustment substances to reduce the damage of drought stress and maintain growth of the seedlings and normal physiological metabolism. But under the condition of serious soil water deficit, M. pingii seedlings will be severely hurt.
【Fund】: 四川省“十二五”育种攻关项目(2011NZ0098-10);; 国家“十二五”科技支撑计划(2011BAC09B05)资助~~
【CateGory Index】: Q945.78
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