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大气臭氧浓度升高对樱桃萝卜生长和生物量的影响(PDF)

《南京林业大学学报(自然科学版)》[ISSN:1000-2006/CN:32-1161/S]

Issue:
2019年05期
Page:
187-192
Column:
研究简报
publishdate:
2019-09-20

Article Info:/Info

Title:
Effects of elevated atmospheric ozone on the growth and biomass of Raphanus sativus L.
Article ID:
1000-2006(2019)05-0187-06
Author(s):
LI Li12 MANNING William3 WANG Xiaoke2
(1.Bamboo Research Institute,Nanjing Forestry University, Nanjing 210037, China; 2. State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China; 3. Stockbridge School of Agriculture, University of Massachusetts, Amherst MA 01003, USA)
Keywords:
atmospheric ozone(O3) AOT40 Raphanus sativus L. hypocotyl biomass injury symptom
Classification number :
S722
DOI:
10.3969/j.issn.1000-2006.201809011
Document Code:
A
Abstract:
【Objective】 High levels of atmospheric ozone(O3), which is an important secondary air pollutant with strong oxidizing capability, can reduce the quantity and quality of vegetation production by damaging the functions and physical structure of plant cells. Therefore, in order to establish a basic understanding of the effects of O3 on crop production, the present study investigated the effects of different O3 concentrations, including AOT40, on the growth(hypocotyl length), biomass(dry weight)and leaf health of cherry reddish (Raphanus sativus). 【Method】 Raphanus sativus were grown in growth chambers under four different O3 concentrations(30, 50, 70 and 90 nmol/mol), and the growth, biomass and foliar injury status of the plants were assessed on a weekly basis for 4 weeks. 【Result】 ① The O3 injury symptoms that were observed under 70 and 90 nmol/mol(i.e., cotyledons with chlorotic stippling and inconsistent thickness)developed within the first week of O3 fumigation, and the injury symptoms intensified with the duration of treatment. Furthermore, the proportion of leaves with injury symptoms was positively correlated with AOT40(accumulated O3 exposure over a threshold of 40(nmol/mol)(P<0.01). ② Meanwhile, elevated O3 concentrations significantly reduced dry mass and hypocotyl size since the 3rd week. At the end of 4th week, the dry mass of hypocotyl had been reduced by 45.1%, 57.3% and 79.9% in 50, 70 and 90 nmol/mol O3 treatments, respectively, when compared to the control group. In addition, the reduction of hypocotyl exhibited a linear relationship with AOT40, and dry mass declined more rapidly than hypocotyl size.【Conclusion】The growth, biomass and injury symptoms of Raphanus sativus were affected by both O3 concentration and duration of exposure.

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Last Update: 2019-10-08