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 共查询到20条相似文献，搜索用时 46 毫秒
1.
Genetic Resources and Crop Evolution - Zea mays ssp. parviglumis is the progenitor of maize and assume to have tolerance against various biotic and abiotic stresses. It...  相似文献   

2.
Genetic Resources and Crop Evolution - The endemic and precious tree Pterocarpus santalinus L. f. (Red sanders) is a drought hardy species for conservation in peninsular India due to its...  相似文献   

3.
Water, Air, & Soil Pollution - Precipitation was collected from May 15, 2001 to November 18, 2002, at the mountain top (620 m a.s.l.) and mountain foot (47 m a.s.l.) of the...  相似文献   

4.
Water, Air, & Soil Pollution - The degradation of benzene in groundwater at concentrations as high as 2,000 mg L?1 was studied using a four-column trickling-flow fixed-film...  相似文献   

5.
Eurasian Soil Science - The quantitative and qualitative diversity of the clay fraction (<1 µm) from parent materials (BC and C horizons), albic (suprasolonetzic eluvial SEL)...  相似文献   

6.
Journal of Soils and Sediments - The purpose of this study is to define the relative contributions of fine (<10 μm) suspended sediment from tributaries within the Burdekin...  相似文献   

7.
Genetic Resources and Crop Evolution - Hancornia speciosa is one target species for genetic diversity ethnobotanical and medicinal applications within the Brazilian Northeast Atlantic...  相似文献   

8.
Bai  Jinshun  Qiu  Shaojun  Jin  Liang  Wei  Dan  Xu  Xinpeng  Zhao  Shicheng  He  Ping  Wang  Ligang  Christie  Peter  Zhou  Wei 《Biology and Fertility of Soils》2020,56(3):319-329
Biology and Fertility of Soils - An incubation experiment with equivalent N rates was conducted for 56 days using a typical black soil amended with chemical fertilizer with or without...  相似文献   

9.
采用生命周期分析方法系统评估测土配方施肥行动的直接与间接环境效益,为深入实施该项目提供依据。以山东省聊城市玉米测土配方施肥项目为例,对玉米施肥生命周期资源消耗与污染物排放进行清单分析,并以习惯施肥区为参照对象评估其实现的净资源节约与污染物减排效益。结果表明,2006~2009年聊城市测土配方施肥项目显著减少了玉米生命周期资源消耗与污染物排放量。通过测土配方施肥,1 t 玉米生命周期实现的富营养化和环境酸化的减缓潜力分别相当于2000年世界人均影响潜力的20%~34%和5%~15%。环境总效益呈逐年下降趋势,这是由于习惯施肥与测土配方施肥的差距越来越小,农民肥料投入趋于理性,表明测土配方施肥通过示范起到了较好的辐射推广作用。  相似文献   

10.
Genetic Resources and Crop Evolution - Loss of seed viability is a serious hurdle in production and ambient seed storage of soybean. Understanding the factors affecting seed viability, and...  相似文献   

11.
Qaswar  Muhammad  Chai  Rushan  Ahmed  Waqas  Jing  Huang  Han  Tianfu  Liu  Kailou  Ye  Xinxin  Xu  Yongmei  Anthonio  Christian Kofi  Zhang  Huimin 《Journal of Soils and Sediments》2020,20(3):1285-1296
Journal of Soils and Sediments - The aim of this study was to investigate the effect of combined use of chemical fertilizers with wheat straw and swine manure on rice yield and phosphorus...  相似文献   

12.
Genetic Resources and Crop Evolution - Marrubium parviflorum Fisch. & C.A. Mey. and Marrubium cuneatum Russell, are naturally distributed in various parts of Iran. It is difficult to...  相似文献   

13.
Jan  Sami  Khan  M. N.  Jan  Sofora  Zaffar  Aaqif  Rashid  Rizwan  Khan  M. A.  Sheikh  F. A.  Bhat  M. Ashraf  Mir  R. R. 《Genetic Resources and Crop Evolution》2022,69(2):661-676
Genetic Resources and Crop Evolution - Barley (Hordeum vulgare L.) is one of the principal cereal crops grown in Western-Himalayas of India. A set of 105 barley genotypes including 38...  相似文献   

14.
Background, Aim and Scope   Environmental contamination by heavy metals affects microbial communities. The number of single and multiple heavy metal resistant bacteria may be an indictor of the level of contamination. This paper details the isolation and characterisation of metal resistant microorganisms isolated from rhizosphere/soil samples obtained from an abandoned zinc, lead and copper mine and a local unaffected site. This data was compared to the level of heavy metal in the soils to establish the effect of metals on the microbial community and to determine the relationship between pollutant levels and resistant strains. This paper outlines the diversity of transferable resistance determinants between both sites and details the levels of heavy metal resistant bacteria and those expressing transferable multiple heavy metal tolerance.Methods   The sample sites were located in Co. Galway, Ireland. The first sample site (site A) was a former lead, zinc and copper mine, which was closed in 1961 due to exhaustion of ore. The second site (site B) was located two and a half kilometres from the mining site and was not affected by the mining operations. Composite soil samples were characterised for general soil matrix composition, organic content, pH and general chemical parameters. The soil was also enumerated for the total viable heterotrophic counts and tested on Pseudomonas selective agar (PSA) for total Pseudomonas counts and Sucrose Asparagine (SA), which is semi-selective for fluorescent Pseudomonas.Results and Discussion   Samples from both site A and site B were analysed by atomic absorption spectrophotometry for the presence of heavy metals. In the case of copper, which has a Dutch list recommended minimum permissible level of 190 µg/Kg dry weight, the levels detected at site A were 1270 µg/Kg dry weight while site B was detected at 36 µg/Kg. The arsenic levels detected at site A were eight times the permissible level (416 µg/Kg) while only half the permissible level was found at site B (13 µg/Kg). Zinc concentrations were also high at site A (4460 µg/Kg) while at site B (553 µg/Kg) they were well below the Dutchlist guidelines (720 µg/Kg). A large number of heavy metal tolerant strains were isolated from both sites. 270 isolates (site A (170) and site B (100)) were screened against 8 metals to examine the extent of multiple resistance. 82% of the strains from site A were found to be resistant to 5 metals. A total of 18% showed resistance to all 8 metals and of those examined only 4% were resistant to only one metal. In contrast isolates from site B showed no multiple resistance to more than 5 metals, while 62% showed resistance to individual metals only. Site A had a higher level of multiple heavy metal resistance strains. Stains isolated from site A had 23 (14%) isolates resistant to zinc, copper, nickel, arsenic and cobalt and site B had no bacteria resistant to all five of these selected metals. The transferability of heavy metal resistance was investigated in the case of 60 multiple heavy metal resistant isolates taken from site A and 50 multiple resistance isolates from site B. Transfer was only detected in isolates from site A, 13% showed transfer and expression of copper, zinc and arsenic resistance determinants. In most cases the transconjugants only expressed resistance to copper, zinc and arsenic, which were the metals, used for selection. This co-transfer of all three determinants suggests a genetic link between these resistance determinants.Conclusion   Heavy metal resistant bacteria are present in both sites, however, the number and presence of multiple transferable resistance phenotypes are confined to the isolates from the heavy metal contaminated site. The presence of high levels of heavy metals selects these multiple resistance phenotypes. Within these communities there seems to be little diversity between the microorganisms, which provides a hugely preferable environment for gene transfer of such metal resistant determinants.Recommendation and Perspective   The experiments have shown a microbes ability to mobilize heavy metal determinants and a relationship between heavy metal resistance and metal contamination has been identified These multiple heavy metal resistant bacteria could eventually be used for detection and qualification of the level of heavy metal-polluted soil/water environments.  相似文献   

15.
Genetic Resources and Crop Evolution - Hancornia speciosa Gomes is a fruit and medicinal tree species native to South America, which in Brazil is considered of potential economic value and...  相似文献   

16.
Genetic Resources and Crop Evolution - Growth habit is a plant architectural trait in grain legumes with no exception of horse gram [Macrotyloma uniflorum (Lam.) Verdc.]. Determinacy and...  相似文献   

17.
Journal of Soils and Sediments - The responses of nitrification and denitrification are not well characterised at temperatures above 35 °C, which is the focus of our study. Soils...  相似文献   

18.
Li  Xiaowen  Bai  Dong  Deng  Qinghui  Cao  Xiuyun  Zhou  Yiyong  Song  Chunlei 《Journal of Soils and Sediments》2021,21(10):3493-3504
Journal of Soils and Sediments - Dissimilatory nitrate (NO3?) reduction to ammonium (DNRA) is a significant nitrogen (N) transformation process in estuarine ecosystem. The objectives...  相似文献   

19.
Journal of Soils and Sediments - The purposes of this study are to characterize the relationship between basal soil respiration at 0 °C (R0) and the temperature sensitivity (Q10) of...  相似文献   

20.
Yu  Diansi  Wang  Hui  Gu  Wei  Qin  Tao  Sun  Pingdong  Lu  Youlin  Shi  Biao  Zheng  Hongjian 《Genetic Resources and Crop Evolution》2021,68(6):2379-2389
Genetic Resources and Crop Evolution - Popcorn is a kind of snack food and has a breeding history of nearly 40 years in China, however, there are relatively few studies on its genetic...  相似文献   

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