N2-FIXATION (ACETYLENE REDUCTION) AND THE MICROBIAL COLONIZATION OF MANGROVE ROOTS
نویسندگان
چکیده
منابع مشابه
In situ studies on N2 fixation using the acetylene reduction technique.
The measurement of in situ N2-fixation rates on the basis of total nitrogen changes or 15N2 uptake is not entirely satisfactory-the former method is insufficiently sensitive and accurate, and the '5N method is time consuming, expensive, and requires a mass spectrometer. The discovery in 1966 by Sch6llhorn and Burris' and by Dilworth2 that the nitrogen-fixing complex (nitrogenase) reduces acetyl...
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Root segments and root-soil cores (6.5-cm diameter) from fields and nurseries of winter wheat and sorghum were tested for N2 fixation by using the acetylene reduction assay. Wheat samples (approximately 1,200) from 109 sites generally had low or no activity (0 to 3.1 nmol of C2H4 produced per h per g [dry weight] of root segments), even after 24 h of incubation. However, a commercial field of S...
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Mangrove forests are highly productive ecosystems but represent low nutrient environments. Nitrogen availability is one of the main factors limiting mangrove growth. Diazotrophs have been identified as key organisms that provide nitrogen to these environments. N2-fixation by such organisms was found to be higher in the mangrove roots than in surrounding rhizosphere. Moreover, previous studies s...
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The involvement of epiphytic microorganisms in nitrogen fixation was investigated in a shallow freshwater pond near Ithaca, N.Y. The acetylene reduction technique was used to follow diel and seasonal cycles of nitrogen fixation by epiphytes of Myriophyllum spicatum. Acetylene-reducing activity was maximal between noon and 6 p.m., but substantial levels of activity relative to daytime rates cont...
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ژورنال
عنوان ژورنال: New Phytologist
سال: 1979
ISSN: 0028-646X,1469-8137
DOI: 10.1111/j.1469-8137.1979.tb02673.x