2019 ; Vol.29-11: 1777~1789
|Author||Junthima Namwongsa, Sanun Jogloy, Nimitr Vorasoot, Sophon Boonlue, Nuntavan Riddech, Wiyada Mongkolthanaruk|
|Place of duty||Department of Microbiology, Faculty of Science, Khon Kaen University, Khon Kaen, 40002, Thailand|
|Title||Endophytic Bacteria Improve Root Traits, Biomass and Yield of Helianthus tuberosus L. under Normal and Deficit Water Conditi|
J. Microbiol. Biotechnol.2019 ;
|Abstract||Drought is more concerned to be a huge problem for agriculture as it affects plant growth and
yield. Endophytic bacteria act as plant growth promoting bacteria that have roles for
improving plant growth under stress conditions. The properties of four strains of endophytic
bacteria were determined under water deficit medium with 20% polyethylene glycol. Bacillus
aquimaris strain 3.13 showed high 1-aminocyclopropane-1-carboxylate (ACC) deaminase
production; Micrococcus luteus strain 4.43 produced indole acetic acid (IAA).
Exopolysaccharide production was high in Bacillus methylotrophicus strain 5.18 while Bacillus
sp. strain 5.2 did not show major properties for drought response. Inoculation of endophytic
bacteria into plants, strain 3.13 and 4.43 increased height, shoot and root weight, root length,
root diameter, root volume, root area and root surface of Jerusalem artichoke grown under
water limitation, clearly shown in water supply at 1/3 of available water. These increases were
caused by bacteria ACC deaminase and IAA production; moreover, strain 4.43 boosted leaf
area and chlorophyll levels, leading to increased photosynthesis under drought at 60 days of
planting. The harvest index was high in the treatment with strain 4.43 and 3.13 under 1/3 of
available water, promoting tuber numbers and tuber weight. Inulin content was unchanged in
the control between well-watered and drought conditions. In comparison, inulin levels were
higher in the endophytic bacteria treatment under both conditions, although yields dipped
under drought. Thus, the endophytic bacteria promoted in plant growth and yield under
drought; they had outstanding function in the enhancement of inulin content under wellwatered
|Key_word||Drought, Inulin, jerusalem artichoke, plant promoting endophytes|
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