Faculty of Science and Arts - Khulais | Researches | Propagation, Taxonomy and ecophysiological characteristics od Azolla- Anabaena symbiosis in freshwater habitats of Beni- Suef Governorate (Egypt).

Faculty of Science and Arts - Khulais

Document Details

Document Type	:	Article In Journal
Document Title	:	Propagation, Taxonomy and ecophysiological characteristics od Azolla- Anabaena symbiosis in freshwater habitats of Beni- Suef Governorate (Egypt). انتشار و تصنيف و الصفات البيئية الفسيولوجية لتكافل أزولا- أنابينا فى بيئات المياه العذبة بمحافظة بنى سويف (مصر).
Document Language	:	Arabic
Abstract	:	A new ecotype of Azolla fern has established in freshwater habitats at Beni-Suef Governorate. The fern propagates in shallow irrigation canals and drains with low-velocity water. Azolla fern is circular (fan-like) in shape with a diameter of 2-3 cm; the surface of the fronds is covered with trichomes and contains stomata with annular guard cells and central pores. Azolla is a sterile hybrid, only forming microsporocarps, never megasporocarps: the microsporocarp contains about 64 microsporangia. Each microsporangium consists of 4 massula, each characterized by the presence of anchor-like multiseptate glochidia covering the whole surface of the massula. This ecotype probably belongs to Azolla caroliniana on the basis of vegetative and reproductive characteristics. Growth (biomass yield) is seasonal, with higher biomass (3.0-4.5 kg m-2) and shorter doubling time in summer, reducing to about 1.0-1.5 kg m-2 in winter. Azolla plants accumulated the minerals Fe, Zn, Cu, Ni and Pb when growing in freshwater canals, drains and waste water. Salt stress treatment inhibited growth, nitrogen fixation and protein content. Iinhibitory levels of salinity were about 0.6-0.8 % NaCl. Growth and nitrogen fixation were inhibited at higher levels (2.4 mol m-3 and 5.1 mol m-3) of combined nitrogen (ammonium sulphate and urea). The ecophysiological significance of Azolla in the freshwater habitats of Beni-Suef Governorate is discussed.
ISSN	:	14356-985
Journal Name	:	Egyptian Journal of Biology
Volume	:	9
Issue Number	:	1
Publishing Year	:	1428 AH 2007 AD
Article Type	:	Article
Added Date	:	Monday, December 27, 2010

Researchers

Researcher Name (Arabic)	Researcher Name (English)	Researcher Type	Dr Grade	Email
عماد على الشريف	Al Sherif, Emad Ali	Investigator	Doctorate	emad_702001@yahoo.com
أيمن حسن أبو الليل	Aboellil, Ayman Hassan	Investigator	Doctorate
حمدى حسين زهران	zahran, hamdi Houssein	Investigator	Doctorate

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