نتایج جستجو برای: p australis

تعداد نتایج: 1272196  

Journal: :American journal of botany 2014
Md Nazim Uddin Randall William Robinson Domenic Caridi Md Abdullah Yousuf Al Harun

PREMISE OF THE STUDY Invasive plants are a great threat to the conservation of natural ecosystems and biodiversity. Allelopathy as a mechanism for invasion of plants such as Phragmites australis, one of the most aggressive invaders, has the potential to suppress neighboring plant species. Allelopathic interference, through root exudates of P. australis on native Melaleuca ericifolia, was invest...

2012
Carla Lambertini Brian K. Sorrell Tenna Riis Birgit Olesen Hans Brix

BACKGROUND AND AIMS Two Phragmites australis taxa are recognized in Europe: P. australis ssp. altissimus, also known as Phragmites isiaca, in the Mediterranean region and P. australis in the temperate region. Another taxonomic group in the Mediterranean is Phragmites frutescens. European genotypes are diverse genetically, cytologically and morphologically, and are related to African, Asiatic an...

2012
Karin M. Kettenring Sylvie de Blois Donald P. Hauber

AIMS We use a regional comparison of Phragmites australis (common reed) subsp. americanus, P. australis subsp. berlandieri and introduced P. australis (possibly five sublineages) in the Chesapeake Bay, the St Lawrence River, Utah and the Gulf Coast to inform a North American perspective on P. australis invasion patterns, drivers, impacts and research needs. FINDINGS AND RESEARCH NEEDS: Our regi...

2017
TODD E. MINCHINTON MARK D. BERTNESS

In recent decades the grass Phragmites australis has been aggressively invading coastal, tidal marshes of North America, and in many areas it is now considered a nuisance species. While P. australis has historically been restricted to the relatively benign upper border of brackish and salt marshes, it has been expanding seaward into more physiologically stressful regions. Here we test a leading...

2012
Xuehong Wang Junbao Yu Di Zhou Hongfang Dong Yunzhao Li Qianxin Lin Bo Guan Yongli Wang

In this study, we compared ecological characteristics of wetland vegetation in a series of restoration projects that were carried out in the wetlands of Yellow River Delta. The investigated characteristics include plant composition structure, species diversity and community similarity in three kinds of Phragmites australis wetlands, i.e. restored P. australis wetlands (R1, R2, R3 and R4: restor...

2017
Ellen V Crocker Eric B Nelson Bernd Blossey

Interactions between introduced plants and soils they colonize are central to invasive species success in many systems. Belowground biotic and abiotic changes can influence the success of introduced species as well as their native competitors. All plants alter soil properties after colonization but, in the case of many invasive plant species, it is unclear whether the strength and direction of ...

Journal: :Plant physiology 2009
Gurdeep Bains Amutha Sampath Kumar Thimmaraju Rudrappa Emily Alff Thomas E Hanson Harsh P Bais

A number of hypotheses have been suggested to explain why invasive exotic plants dramatically increase their abundance upon transport to a new range. The novel weapons hypothesis argues that phytotoxins secreted by roots of an exotic plant are more effective against naïve resident competitors in the range being invaded. The common reed Phragmites australis has a diverse population structure inc...

2006
TODD E. MINCHINTON JULIET C. SIMPSON MARK D. BERTNESS

1 Determining the mechanisms by which invasive species exclude natives is critical for conserving and restoring native populations in impacted habitats. In recent decades the grass Phragmites australis has been aggressively invading coastal marshes of North America, with monocultures often replacing diverse assemblages of plants. 2 Our objective was to quantify how P. australis modifies the abi...

2013
Yue Yuan Kaiyun Wang Dezhi Li Yu Pan Yuanyuan Lv Meixia Zhao JinJin Gao

The invasive species Spartina alterniora Loisel was introduced to the eastern coast of China in the 1970s and 1980s for the purposes of land reclamation and the prevention of soil erosion. The resulting interspecific competition had an important influence on the distribution of native vegetation, which makes studying the patterns and mechanisms of the interactions between Spartina alterniora Lo...

پایان نامه :دانشگاه آزاد اسلامی - دانشگاه آزاد اسلامی واحد علوم دارویی - دانشکده داروسازی 1392

جلبک ها به سه دسته سبز، قهوه ای و قرمز تقسیم بندی می شوند. آنها در مکمل های غذایی، لوازم آرایشی و صنایع داروسازی استفاده می شوند و نیز تحقیقات حاکی از اثرات هیپوتانسیون، هیپوگلایسمیک، سایتوتوکسیک و ضد التهاب آنها هستند. در تحقیق حاضر فعالیت آنتی اکسیدانی، مهار کنندگی استیل کــولیـن اسـتــراز(achei) و سایـتـوتـوکسیـک دو گـونـه جـلـبـک به نـام هـای padina australis و p . tetrastromatica بررسی شد....

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