Sustained growth promotion in Arabidopsis with long-term exposure to the beneficial soil bacteriumBacillus subtilis(GB03)

Abstract

Volatile emissions from the commercial growth promoting soil bacterium Bacillus subtilis (GB03) are effective in augmenting short-term growth, photosynthetic capacity and salt tolerance in Petri-dish grown arabidopsis seedlings. In contrast, the impact sustained GB03 volatile exposure on plant growth and development has yet to be examined. here is provided physical and physiological data establishing that bacterial volatiles induce long-term growth promotion, elevated photosynthetic capacity and iron accumulation, as well as delayed albeit higher seed count compared with water-treated control plants. Plants were grown unrestricted in double Magenta boxes containing solid MS media for up to twelve weeks with GB03 volatiles introduced in separate containers within the chamber so that plant bacterial interactions were only by airborne transmission. These results establish that GB03 volatiles induce sustained beneficial effects on Arabidopsis growth including robust and extended vegetative growth followed by elevated seed set.

Manipulating the soil microbiome to increase soil health and plant fertility

“…Recent discoveries have shown that plants also interact with a variety of PGPRs that are capable of increasing photosynthetic capacity (Xie et al 2009;Zhang et al 2008b), conferring drought and salt tolerance (Dimkpa et al 2009;Xie et al 2009;Zhang et al 2008aZhang et al , 2009aZhang et al , 2010, increase disease suppression (Chithrashree et al 2011;Jetiyanon and Kloepper 2002;Okubara and Bonsall 2008), plant growth (Hayat et al 2010;Lim and Kim 2009), and improving the effectiveness of the plant's own iron acquisition mechanisms (Zhang et al 2009a). These discoveries may offer potential for PGPR applications to improve agricultural production and sustainability.…”

Transcriptional profiling in cotton associated with Bacillus subtilis (UFLA285) induced biotic-stress tolerance

“…With PGPR-induced salt tolerance, the sodium uptake transporter HKT1 has been shown to be organ specifically regulated in Arabidopsis by B. subtilis resulting in reduced endogenous sodium when plants are grown with elevated salt (Zhang et al 2008). For growth promotion, PGPR have been linked with auxin redistribution from leaves to roots that in turn is associated with foliar cell expansion and lateral root proliferation in Arabidopsis (Zhang et al 2007;Xie et al 2009). …”

Understanding and Enhancing Soil Biological Health: The Solution for Reversing Soil Degradation

“…With emerging extreme climatic changes, another critical question is whether cropping system sustainability can be increased by using plants that can interact with a variety of PGPR/B that are capable of increasing photosynthetic capacity [126,127], conferring drought and salt tolerance [126,[128][129][130], and improving the effectiveness of the plant's own iron acquisition mechanisms [129]. A variety of companies have begun to offer new products that consist of PGPR/B inoculants (soil and/or seed treatments), or chemicals aimed at increasing root exudation to help foster PGPR/B establishment.…”