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Plant Growth Promoting Effects of Nepalese Sweet Potato Endophytes

The United Graduate School of Agricultural Sciences, Tottori University, 4-101 Koyama-Minami, Tottori 680-8553, Japan
Nepal Agricultural Research Council, Singhadurbar Plaza, Kathmandu 44600, Nepal
Faculty of Life and Environmental Sciences, Shimane University, 1060 Nishikawatsu, Matsue, Shimane 690-8504, Japan
Author to whom correspondence should be addressed.
Horticulturae 2018, 4(4), 53;
Received: 11 October 2018 / Revised: 27 November 2018 / Accepted: 30 November 2018 / Published: 6 December 2018
(This article belongs to the Special Issue Horticultural Crop Microbiomes)
Endophytic bacteria form a symbiotic relation with plants and generally cause no harmful effects to the host plants. In a previous study, we isolated eight bacterial endophytes from sweet potato plants harvested in Salyan, Nepal. These endophytes showed plant growth-promoting properties as a mixed culture. In this study, we evaluated the ability of these strains to produce indole-3-acetic acid (IAA) and to fix nitrogen. Based on these results, we selected two strains, Klebsiella sp. Sal 1 and Enterobacter sp. Sal 3, and evaluated their ability to promote plant growth. IAA production activity peaked at 15–60 mg NH4NO3/L in plant-free medium. Similarly, acetylene reduction activity peaked at 0–6.25 mg NH4NO3/L. Both strains successfully colonized plants, promoted the growth of tomatoes, and induced phenotypes in plants consistent with IAA exposure. This suggests that these strains promote plant growth by producing IAA inside the plant, where nitrogen levels are expected to be low. View Full-Text
Keywords: endophyte; indole-3-acetic acid (IAA); sweet potato; tomato; nitrogen fixation; colonization endophyte; indole-3-acetic acid (IAA); sweet potato; tomato; nitrogen fixation; colonization
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Adhikari Dhungana, S.; Adachi, F.; Hayashi, S.; Raj Puri, R.; Itoh, K. Plant Growth Promoting Effects of Nepalese Sweet Potato Endophytes. Horticulturae 2018, 4, 53.

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