Characterization of bacterial endophytes of sweet potato plants

Khan, Zareen; Doty, Sharon L.

doi:10.1007/s11104-009-9908-1

Cited by 156 publications

(103 citation statements)

References 65 publications

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“…Our results of root length are in accordance with the research findings of Khan et al (2009), who isolated the IAA producing endophyte from sweet potato and showed an excellent root growth when inoculated onto poplar plant (hybrid variety). Similarly, the EBIs isolated from mangrove are known to promote root length of rice seedlings derived from seeds inoculated with EBIs which proves that endophytes are beneficial to non-host plants (Deivanai Subramanian et al, 2014).…”

Section: Results and Discusssionsupporting

confidence: 91%

Screening of cultivable endophytic bacterial isolates for their plant growth promoting activity in rice

Firdous

2017

IJARe

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Large amounts of chemical fertilizers are being used to enhance the growth and development of the rice (Oryza sativa L.) crop. Chemical fertilizers are too expensive; hence, endophytic bacteria with growth promoting activity can be considered to promote the crop plant growth to minimize the usage of chemical fertilizers and to have sustainable rice cultivation. This study was undertaken to explore the potential of endophytic bacterial isolates (EBIs) which were isolated previously. The objective of this study was to evaluate 800 EBIs for auxin-like activity and its effect on early seedlings growth of rice. Surface sterilized rice seeds were treated separately with different EBIs and allowed to grow in Petriplates (containing sterile cotton) for 10 days. On the 10 th day, the root length of the rice seedlings was measured and recorded to determine the auxin-like activity of EBIs. Results showed that 9 different isolates out of 800 EBIs screened to have significant effect on rice root and shoot growth when compared to control. The increase in root length was in the range of 58.30% to 81.68%, in comparison to root length of seedlings from control category. Based on the results, it was concluded that the positive root growth promoting response of rice seedlings could be due to the production of auxin-like compounds by the EBIs. These research findings could be useful in developing endophytic bacteria based formulation to enhance the growth of rice crop.

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Section: Results and Discusssionsupporting

confidence: 91%

Screening of cultivable endophytic bacterial isolates for their plant growth promoting activity in rice

Firdous

2017

IJARe

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“…Proteobacteria members were the dominate species in the atmosphere over mountains (Bowers et al, 2012;Vaïtilingom et al, 2012;Temkiv et al, 2012), in the air samples collected on a tower (Fahlgren et al, 2010), and from the troposphere (DeLeon-Rodriguez et al, 2013;Kourtev et al, 2011). In the phylum proteobacteria, the families Phyllobacteriaceae, Methylobacteriaceae, and Xanthomonadaceae were predominately detected from the non-dust samples and are associated with plant bodies or surfaces (Mantelin et al, 2006;Fürnkranz et al, 2008;Khan and Doty, 2009;Fierer and Lennon, 2011). The Betaproteobacteria sequences in the non-dust samples mainly contained the Oxalobacteraceae and Comamonadaceae families, which are commonly dominate in freshwater environments (Nold and Zwart, 1998) and on plant leaves (Redford et al, 2010).…”

Section: Dominant Bacterial Populations In the Air Masses Originated mentioning

confidence: 99%

Variations in airborne bacterial communities at high altitudes over the Noto Peninsula (Japan) in response to Asian dust events

et al. 2017

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Abstract. Aerosol particles, including airborne microorganisms, are transported through the free troposphere from the Asian continental area to the downwind area in East Asia and can influence climate changes, ecosystem dynamics, and human health. However, the variations present in airborne bacterial communities in the free troposphere over downwind areas are poorly understood, and there are few studies that provide an in-depth examination of the effects of long-range transport of aerosols (natural and anthropogenic particles) on bacterial variations. In this study, the vertical distributions of airborne bacterial communities at high altitudes were investigated and the bacterial variations were compared between dust events and non-dust events.

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“…3,4) Acetobacter diazotrophicus, an endophytic nitrogen-xing bacterium, has been isolated from aerial parts of eld-grown sweet potato, sugarcane, and sweet sorghum (Sorghum vulgare), 3,5) and various nitrogen-xing bacteria were shown to colonize the sago palm extensively. 6) In a recent study by Khan and Doty, 7) endophytic bacteria associated with sweet potato plants were isolated, identi ed, and tested for their ability to x nitrogen and exhibit stress tolerance.…”

Section: Introductionmentioning

confidence: 99%

Activation of Nitrogen-Fixing Endophytes Is Associated with the Tuber Growth of Sweet Potato

et al. 2014

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Endophytic nitrogen-xing organisms have been isolated from the aerial parts of eld-grown sweet potato (Ipomoea batatas). e 15 N dilution method, which is based on the di erences in stable nitrogen isotope ratios, is useful for measuring nitrogen xation in the eld. In this study, seedlings of two sweet potato cultivars, 'Beniazuma' and 'Benikomachi,' were transplanted into an alluvial soil that had been treated with organic improving material in advance. Whole plants were sampled every 2 or 3 weeks. A er separating plants into tuberous roots and leaves, the fresh weights of the samples were measured, and the nitrogen content and natural 15 N content of leaves were determined with an elemental analyzer and an isotope ratio mass spectrometer linked to an elemental analyzer, respectively. e contribution of nitrogen xation derived from atmospheric N 2 in sweet potato was calculated by assuming that leaves at 2 weeks a er transplanting were in a non-nitrogen-xing state. e contribution ratios of nitrogen xation by nitrogen-xing endophytes in leaves of both sweet potato cultivars increased rapidly from 35 to 61 days a er transplanting and then increased gradually to 55-57% at 90 days a er transplanting. Over the course of the sweet potato growing season, the activity of nitrogen-xing endophytes in leaves began to increase at about 47 days a er transplanting, the weight of leaves increased rapidly, and then growth of tuberous roots began a few weeks later. Our ndings indicate that nitrogen-xing endophytes will be activated under inorganic nitrogen-free sweet potato cultivation, allowing for growth of the tuberous roots.

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Characterization of bacterial endophytes of sweet potato plants

Cited by 156 publications

References 65 publications

Screening of cultivable endophytic bacterial isolates for their plant growth promoting activity in rice

Screening of cultivable endophytic bacterial isolates for their plant growth promoting activity in rice

Variations in airborne bacterial communities at high altitudes over the Noto Peninsula (Japan) in response to Asian dust events

Activation of Nitrogen-Fixing Endophytes Is Associated with the Tuber Growth of Sweet Potato

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