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当前位置: 首页 > 文章 > 生物炭减缓干旱胁迫对秋子梨根系呼吸生理功能的影响 果树学报 2016 (1) 90-97
Position: Home > Articles > Biochar alleviates effects of drought stress on root respiration in Pyrus ussuriensis Journal of Fruit Science 2016 (1) 90-97

生物炭减缓干旱胁迫对秋子梨根系呼吸生理功能的影响

作  者：
杜国栋;刘志琨;赵玲;吕三三;汪晓谦
单  位：
沈阳农业大学园艺学院辽宁省果树品质发育与调控重点实验室;沈阳农业大学园艺学院河北省邯郸市成安县综合职业技术学校沈阳农业大学工程学院
关键词：
秋子梨;生物炭;干旱胁迫;呼吸代谢
摘  要：
【目的】探讨生物炭减缓干旱胁迫对秋子梨幼苗根系呼吸代谢功能的影响机制。【方法】以1年生盆栽秋子梨(Pyrus ussuriensis Maxim.)幼苗为试材,主要利用液相氧电极技术和方法,研究废弃枝条制成的生物炭对干旱胁迫下秋子梨幼苗根系活力、根系呼吸代谢途径、关键酶活性及中间产物的影响。【结果】土壤干旱胁迫期间,干旱处理的土壤相对含水量呈明显下降趋势。而生物碳处理的土壤含水量一直高于干旱处理水平。其中,干旱胁迫3 d,生物炭处理的土壤含水量较干旱处理高23.6%。生物炭处理的根系活力较干旱处理下降缓慢,干旱胁迫7~11 d,生物炭处理的根系活力分别较干旱处理高28.2%、23.0%和20.4%;生物炭处理有效减缓根系呼吸代谢EMP途径贡献率下降幅度,维持稳定的TCA途径贡献率,PPP途径贡献率升幅较小,线粒体电子传递途径仍以细胞色素途径(CP)为主,PPP途径的关键酶G-6-PDH和6-PGDH活性明显高于同期干旱处理,根系TCA途径中间产物丙酮酸和柠檬酸含量高于干旱处理。【结论】生物炭减缓干旱胁迫下土壤水分损耗,减轻土壤干旱胁迫对秋子梨幼苗根系呼吸代谢功能的抑制作用,提高秋子梨植株对干旱胁迫的适应能力。
译  名：
Biochar alleviates effects of drought stress on root respiration in Pyrus ussuriensis
作  者：
DU Guodong;LIU Zhikun;ZHAO Ling;Lü Sansan;WANG Xiaoqian;Lü Deguo;College of Horticulture, Shenyang Agricultural University;Comprehensive Vocational and Technical Schools of Cheng'an County in Hebei Province;College of Engineering, Shenyang Agricultural University;
关键词：
Pyrus ussuriensis Maxim;;Biochar;;Drought stress;;Respiratory metabolism
摘  要：
【Objective】The study aims to clarify the physiological mechanism of biochar alleviating the impact of drought stress on root respiratory metabolism in Pyrus ussuriensis Maxim. seedlings.【Methods】One-year-old potted seedlings of Pyrus ussuriensis were used in this experiment to determine the effectiveness of biochar prepared from discarded branches, on root activities, respiratory pathways, key enzyme activities and intermediate products of respiratory pathways under drought stress.【Results】Soil relative moisture significantly decreased in drought treatment. However, soil moisture of biochar treatment was23.6% higher than that without biochar at the 3rd day of drought treatment. Biochar treatment delayed the declining of root activities under drought condition. At the 7thday, the 9thday, and the 11 thday, root activity in biochar treatment increased by 28.2%, 23.0%, and 20.4%, respectively. Biochar effectively reduced the range of decrease in EMP contribution to respiration and stabilized the contribution rate of TCA path-way. Moreover, the contribution rate of PPP pathway in biochar treatment slightly increased. In both biochar treatment and drought treatments, the cytochrome pathway(CP) was always the principal electron transport pathway in the root of Pyrus ussuriensis. The activities of G-6-PDH and 6-PGDH, key enzymes in PPP pathway were significantly higher in biochar treatment. The contents of pyruvate acid and citric acid which are the intermediate products in TCA pathway were higher in the biochar treatment than those in the non-biochar treatments.【Conclusion】Biochar could enhance the adaptability of Pyrus ussuriensis seedlings to soil drought through slowing down the loss of soil available moisture and alleviating the inhibitory effect of soil drought on root respiratory metabolism.

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