Virus - like particles associated with dieback symptoms in the brown alga Ecklonia radiata
نویسنده
چکیده
Since 1991 epidemic dieback of the kelp Ecklonia radiata has been observed at the Leigh h4arine Reserve and other sites in northern New Zealand. As the dominant phaeophycean E. radiata is a very important component of the eastern coastal ecosystem, providing both food and refuge for many species. Examination of the E. radiata sap extracts by electron microscopy detected the presence of both straight (ca 280 nm) and flexuous (ca 700 to 900 nm) virus-like filamentous particles. Extracts from several dieback-affected plants also reacted positively with potyvirus group monoclonal antibody.
منابع مشابه
A new phlorotannin from the brown alga Ecklonia stolonifera.
A new phlorotannin, named eckstolonol (1), was isolated from the EtOAc soluble fraction of the methanolic extract of the brown alga, Ecklonia stolonifera OKAMURA, along with three known phlorotannins, eckol (2), phlorofucofuroeckol A (3), and dieckol (4). The structure of eckstolonol was identified as 5,8,13,14-tetraoxa-pentaphene-1,3,6,9,11-pentaol on the basis of spectroscopic evidence. The n...
متن کامل‘Awa Dieback in Hawaii
brown leaf spots; or diffuse yellow blotches. Severely affected plants have rotten basal stems and stumps and black, rotten roots. Symptoms of ‘awa dieback may resemble other ‘awa diseases or conditions. The mosaic symptoms associated with ‘awa dieback resemble nutrient deficiencies (e.g., nitrogen, potassium, and iron) caused by insufficient fertilizer applications or planting in a nutrient-po...
متن کاملNovel ssDNA Viruses Detected in the Virome of Bleached, Habitat-Forming Kelp Ecklonia radiata
Kelp forests provide essential habitats for organisms in temperate rocky shores. Loss of kelp forests has occurred over large areas in a number of temperate regions, including in Australia, where the dominant kelp Ecklonia radiata has been lost from substantial areas of the shoreline. Loss of E. radiata has been associated with environmental stressors, including increased temperature and anthro...
متن کاملInhibition of HIV-1 reverse transcriptase and protease by phlorotannins from the brown alga Ecklonia cava.
The bioassay-directed isolation of a marine brown alga, Ecklonia cava, afforded four phlorotannin derivatives, eckol (1), 8,8'-bieckol (2), 8,4"'-dieckol (3), and phlorofucofuroeckol A (4). Among these compounds, 2 and 3 exhibited an inhibitory effect on human immunodeficiency virus type 1 (HIV-1) reverse transcriptase (RT) and protease. Specifically, they inhibited the RT more potently than th...
متن کاملThe extent of die-back of the kelp Ecklonia radiata in the Cape Rodney to Okakari Point Marine Reserve
The extent of die-back of the kelp Ecklonia radiata in the Cape Rodney to Okakari Point Marine Reserve. Summary The kelp Ecklonia radiata has undergone high rates of mortality in a region of northeastern New Zealand stretching from Whangarei Heads south to Cape Rodney and east to Great Barrier Island. Die-back of this kelp began in late 1991 and continued up to May 1993, with mortathy of over 9...
متن کامل