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Changes in Acetylene Reduction Activities and nifH Genes Associated with Field-Grown Sweet Potatoes with Different Nursery Farmers and Cultivars

Faculty of Life and Environmental Sciences, Shimane University, 1060 Nishikawatsu, Matsue, Shimane 690-8504, Japan
Author to whom correspondence should be addressed.
Horticulturae 2019, 5(3), 53;
Received: 17 May 2019 / Revised: 22 July 2019 / Accepted: 25 July 2019 / Published: 27 July 2019
(This article belongs to the Special Issue Horticultural Crop Microbiomes)
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Sweet potato cultivars obtained from different nursery farmers were cultivated in an experimental field from seedling-stage to harvest, and the acetylene reduction activity (ARA) of different parts of the plant as well as the nifH genes associated with the sweet potatoes were examined. The relationship between these parameters and the plant weights, nitrogen contents, and natural abundance of 15N was also considered. The highest ARA was detected in the tubers and in September. Fragments of a single type of nitrogenase reductase gene (nifH) were amplified, and most of them had similarities with those of Enterobacteriaceae in γ-Proteobacteria. In sweet potatoes from one nursery farm, Dickeya nifH was predominantly detected in all of the cultivars throughout cultivation. In sweet potatoes from another farm, on the other hand, a transition to Klebsiella and Phytobacter nifH was observed after the seedling stage. The N2-fixing ability contributed to plant growth, and competition occurred between autochthonous and allochthonous bacterial communities in sweet potatoes. View Full-Text
Keywords: sweet potato; endophyte; nitrogen fixation; nifH gene sweet potato; endophyte; nitrogen fixation; nifH gene

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Itoh, K.; Ohashi, K.; Yakai, N.; Adachi, F.; Hayashi, S. Changes in Acetylene Reduction Activities and nifH Genes Associated with Field-Grown Sweet Potatoes with Different Nursery Farmers and Cultivars. Horticulturae 2019, 5, 53.

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