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The effects of exogenous salicylic acid on growth and H2O2-metabolizing enzymes in rice seedlings under lead stress 总被引:4,自引:0,他引:4
Salicylic acid (SA) was an essential component of the plant resistance to pathogens and also plays an important role in mediating plant response to some abiotic stress. The possible effects of SA on the growth and H2O2-metabolizing enzymes in rice seedlings under lead stress were studied. When rice seedlings grown in nutrient solution containing Pb^2+ (0, 0.05, 0.15, 0.25 mmol/L) for 18 d, the plant biomass as well as the chlorophyll content of leaves decreased with increasing Pb concentration. The pre-treatment with SA (treated with 0.1 mmol/L SA for 48 h before Pb stress) partially protected seedlings from Pb toxicity. The chlorophyll contents were significant higher in leaves of Pb-exposed with SA pre-treatment seedlings than in Pb-exposed plants at the same Pb intensity. SA pre-treated alone could significantly increase the length of shoot and root of seedlings but the vigour difference was not marked under long-term exposure to Pb toxicity. SA pre-treated influence the H2O2 level in leaves of seedlings by up-regulating the activity of superoxide dismutase (SOD), repressing the activity of catalase (CAT) and ascorbate peroxidase (APX) depending on the concentrations of Pb^2+ in the growth medium. The results supported the conclusion that SA played a positive role in rice seedlings against Pb toxicity. 相似文献
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依据采矿区裂隙岩体中存在的具有鲜明水理性质的膨胀性充填物,应用有限元分析软件ANSYS对裂隙全充填的岩体进行了数值模拟计算,重点探讨了膨胀性充填介质对裂隙岩体位移、应力场的影响。结果表明:裂隙充填物的膨胀效应增大了裂隙岩体各应力的分量,因此当计算的裂隙岩体应力呈非线性分布时,应综合考虑裂隙充填物吸水膨胀效应,否则计算结果将偏于不安全;导致裂隙扩展的楔切效应显著,但裂隙岩体未受到拉张和剪切破坏。通过将模拟结果与实测结果进行对比分析,验证了该模拟方法的有效性和可靠性。 相似文献
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To analyze the effect of nutrient addition on small- and medium-sized soil arthropod communities in a Stipa Baikal meadow grassland, a nitrogen (N) and phosphorus (P) addition experiment was designed in the Stipa Baikal meadow grassland at Ewenki Banner, Hulunbeier City, Inner Mongolia, China in 2010. Changes in the structure and diversity of soil arthropod communities and their relationship with environmental factors were studied. Soil arthropod samples were collected during the forage greening (May), growth (August), and yellowing (end of September) periods in 2019. The results showed that: (1) compared to the control sample, N-added and NP-added samples had higher number of soil arthropods by 1.38 and 1.15 times, respectively, and an increase of 28.57% and 21.43% in the number of soil arthropod groups. The numbers of individual as well as groups of soil arthropods tended to increase with P addition; however, this response did not reach a significant level. (2) The water and heat conditions during the vegetation growth period in the test area were more suitable for the development of soil fauna communities. (3) The redundancy analysis (RDA) results further indicated that the community composition of soil fauna is mainly regulated by pH and plant evenness, and soil pH is particularly important in mediating changes in small- and medium-sized soil fauna communities. This study suggests that long-term nutrient addition has a positive impact on small- and medium-sized soil arthropod communities by changing plant evenness and soil pH, and the contribution of soil pH is greater than that of plant evenness. © 2022 Authors. All rights reserved. 相似文献
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Factors affecting the adoption of multiple climate‐smart agricultural practices in the Indo‐Gangetic Plains of India
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Jeetendra Prakash Aryal Dil Bahadur Rahut Sofina Maharjan Olaf Erenstein 《Natural resources forum》2018,42(3):141-158
Climate change poses a major threat to agricultural production and food security in India, and climate‐smart agriculture (CSA) is crucial in addressing the potential impacts. Using survey data from 1,267 farm households in 25 villages from Bihar and Haryana in the Indo‐Gangetic Plains, this study analyzes the factors that determine the probability and level of adoption of multiple CSA practices, including seeds of stress‐tolerant varieties, minimum tillage, laser land leveling, site‐specific nutrient management and crop diversification. We applied a multivariate probit model for the simultaneous multiple adoption decisions, and ordered probit models for assessing the factors affecting the level of adoption. The adoption of the various CSA practices is interrelated, whereas several factors, including household characteristics, plot characteristics, market access and major climate risks are found to affect the probability and level of CSA adoption. Climate‐smart agriculture (CSA) adoption and its intensity also vary significantly between eastern Bihar, which is relatively poor and densely populated, and north‐western Haryana. Engaging multiple stakeholders such as farmers, agricultural institutions, agricultural service providers and concerned government departments at the local level is crucial for the large‐scale uptake of CSA. The study, therefore, calls for agricultural policy reforms so that most of the issues related to the uptake of CSA can be adequately addressed. 相似文献
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应用低应变反射波法对锚杆锚固系统进行无损检测时,常因锚杆底端反射很微弱而影响锚固系统中应力波波速的准确确定,导致锚固质量无法准确判读,为此,采用低应变反射波法测试了不同围岩和锚固介质中的锚固系统应力波波速,并与采用超声波法测试的由锚固介质材料所制作标准试块中的应力波波速进行对比分析。结果表明,这2种波速与锚固介质材料强度密切相关;锚固系统中的应力波波速介于锚固介质材料与自由锚杆中的应力波波速之间,锚固系统中的应力波波速和锚杆介质材料中的应力波波速随龄期和强度均呈指数关系变化且对称分布。 相似文献
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老南瓜含有丰富的胡萝卜素、维C、多糖和一定的食疗价值,也可加工成多种南瓜产品,近年来越来越深受消费者喜爱,目前国内种植最为普遍的老南瓜品种主要是中国类型老南瓜,本文现将主要介绍我国老南瓜种植品种、栽培模式和技术要点. 相似文献