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Abdul Latif Khan,Muhammad Waqas,강상모,Ahmed Al-Harrasi,Javid Hussain,Ahmed Al-Rawahi,Salima Al-Khiziri,Ihsan Ullah,Liaqat Ali,정희영,이인중 한국미생물학회 2014 The journal of microbiology Vol.52 No.8
Plant growth promoting endophytic bacteria have been identifiedas potential growth regulators of crops. Endophyticbacterium, Sphingomonas sp. LK11, was isolated from theleaves of Tephrosia apollinea. The pure culture of Sphingomonassp. LK11 was subjected to advance chromatographicand spectroscopic techniques to extract and isolate gibberellins(GAs). Deuterated standards of [17, 17-2H2]-GA4,[17, 17-2H2]-GA9 and [17, 17-2H2]-GA20 were used to quantifythe bacterial GAs. The analysis of the culture broth ofSphingomonas sp. LK11 revealed the existence of physiologicallyactive gibberellins (GA4: 2.97 ± 0.11 ng/ml) and inactiveGA9 (0.98 ± 0.15 ng/ml) and GA20 (2.41 ± 0.23). Theendophyte also produced indole acetic acid (11.23 ± 0.93μM/ml). Tomato plants inoculated with endophytic Sphingomonassp. LK11 showed significantly increased growth attributes(shoot length, chlorophyll contents, shoot, and rootdry weights) compared to the control. This indicated thatsuch phyto-hormones-producing strains could help in increasingcrop growth.