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Prodigiosin is a reddish antibiotic pigment that plays an important role in the biocontrol of plant diseases by the bacterium
Serratia marcescens. However, its activity is unstable under agricultural conditions; further, it can be degraded by various environmental factors.
To examine the effect of epiphytic microbes on the stability of prodigiosin used for biological control processes, we collected
a total of 1,280 bacterial isolates from the phylloplane of cyclamen and tomato plants. Approximately 72% of the bacterial
strains isolated from the cyclamen plants and 66% of those isolated from the tomato plants grew on minimal agar medium containing
100 μg ml−1 prodigiosin. Certain isolates obtained from both plant species exhibited prodigiosin-degrading activity. We compared the
16S rRNA gene sequences derived from the isolates with sequences in a database. The comparison revealed that the sequences
determined for the prodigiosin-degrading isolates were homologous to those of the genera Pseudomonas, Caulobacter, Rhizobium, Sphingomonas, Janthinobacterium, Novosphingobium, and Rathayibacter. These results indicate that indigenous epiphytic microorganisms may interfere with the interaction between plant pathogens
and biocontrol agents by degrading the antibiotics produced by the agents. 相似文献
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Organic residue decomposition: The minicontainer-system a multifunctional tool in decomposition studies 总被引:1,自引:0,他引:1
Gerhard Eisenbeis Ralf Lenz Thomas Heiber 《Environmental science and pollution research international》1999,6(4):220-224
The Minicontainer-test, first described by Eisenbeis (1993), was designed to study the kinetics of organic residue decomposition
at a microsite level. It is derived from the litterbag technique and consists of polyethylene minicontainers (volume about
1.5 cm3) filled with a test substrate (litter, straw, cellulose, etc.). The minicontainers (MCs) are closed at either end with plastic
gauze discs of variable mesh size (e.g. 20 μm, 250 μm, 500 μm or 2 mm). A definite number of such units are inserted into
PVC-bars, which can be implanted into the soil horizontally or vertically, or be exposed on the soil surface horizontally.
The bars are very stable and can be exposed in different environments for months to years. If required, the bars can be removed
temporarily and stored, e.g. during soil cultivation. Should fresh litter be used, two phases of decomposition can be distinguished:
a fast initial phase, which can be mainly related to the effect of leaching, and a second slow phase depending mainly on the
activity of soil organisms and litter quality. Several questions can be addressed to investigations using MCs, e.g. 1) parts
of the soil fauna which are involved in decomposition (nematodes, microarthropods, and smaller specimens of the macrofauna,
e.g. enchytraeidae, diplopods and dipteran larvae) can be extracted from the litter substrate using a miniscale high gradient
extractor, 2) the organic mass loss of litter can be determined, 3) microbial biomass (Cmic, Nmic) can be assessed by fumigation extraction and 4) microbial activity (respiration) in the test substrate can also be assessed
by use of standardised methods. Compared to litterbag studies, the larger number of small replicate units improves the statistical
evaluation. Until today the Minicontainer-test has been applied in forestry and agriculture, e.g. studying the effects of
liming, soil restoration and the application of insecticides, e.g. Diflubenzuron (Dimilin) and Btk (Bacillus thuringiensis var.kurstaki). 相似文献
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运用经验公式分析BOD5 总被引:2,自引:2,他引:0
运用经验公式分析BOD5,节省时间、人力、财力,对污染源企业用此方法是可行的。 相似文献
88.
Axel Hochkirch Michael J. Samways Justin Gerlach Monika Böhm Paul Williams Pedro Cardoso Neil Cumberlidge P. J. Stephenson Mary B. Seddon Viola Clausnitzer Paulo A. V. Borges Gregory M. Mueller Paul Pearce-Kelly Domitilla C. Raimondo Anja Danielczak Klaas-Douwe B. Dijkstra 《Conservation biology》2021,35(2):502-509
Measuring progress toward international biodiversity targets requires robust information on the conservation status of species, which the International Union for Conservation of Nature (IUCN) Red List of Threatened Species provides. However, data and capacity are lacking for most hyperdiverse groups, such as invertebrates, plants, and fungi, particularly in megadiverse or high-endemism regions. Conservation policies and biodiversity strategies aimed at halting biodiversity loss by 2020 need to be adapted to tackle these information shortfalls after 2020. We devised an 8-point strategy to close existing data gaps by reviving explorative field research on the distribution, abundance, and ecology of species; linking taxonomic research more closely with conservation; improving global biodiversity databases by making the submission of spatially explicit data mandatory for scientific publications; developing a global spatial database on threats to biodiversity to facilitate IUCN Red List assessments; automating preassessments by integrating distribution data and spatial threat data; building capacity in taxonomy, ecology, and biodiversity monitoring in countries with high species richness or endemism; creating species monitoring programs for lesser-known taxa; and developing sufficient funding mechanisms to reduce reliance on voluntary efforts. Implementing these strategies in the post-2020 biodiversity framework will help to overcome the lack of capacity and data regarding the conservation status of biodiversity. This will require a collaborative effort among scientists, policy makers, and conservation practitioners. 相似文献
89.
Tao Liu Yudong Song Zhiqiang Shen Yuexi Zhou 《Frontiers of Environmental Science & Engineering》2021,15(6):119
90.
《生物多样性公约》缔约方大会第10次会议(COP-10)决定设立名古屋议定书政府间委员会(ICNP),主要负责《关于遗传资源获取与惠益分享(ABS)的名古屋议定书》(简称《议定书》)缔约方大会第1次会议(COP/MOP-1)的筹备工作。2011年6月、2012年7月和2014年2月,分别在加拿大、印度和韩国共召开了3次会议。会议对《议定书》生效和执行将面临的问题开展了讨论。通过详细梳理不同缔约方与其它国家政府对两年期方案预算、COP/MOP议事规则、COP/MOP-1临时议程草案、全球多边惠益分享机制、ABS信息交换所、能力建设、意识提高、遵约程序和机制、监测与报告以及示范合同条款等主要议题所持观点,总结了会议的进展动态,综合分析了各议题的谈判成效,深入探讨了名古屋议定书委员会对《议定书》生效和执行的积极作用以及面临的挑战。 相似文献