Herbaspirillum sp. strain GW103 alleviates salt stress in Brassica rapa L. ssp. pekinensis

Abstract

Mutual interactions between plant and rhizosphere bacteria facilitate plant growth and reduce risks of biotic and abiotic stresses. The present study demonstrates alleviation of salt stress in Brassica rapa L. ssp. perkinensis (Chinese cabbage) by Herbaspirillum sp. strain GW103 isolated from rhizosphere soil of Phragmites australis. The strain was capable of producing plant beneficial factors, such as auxin, siderophore, and 1-aminocylopropane-1-carboxylic acid deaminase. Treatment of strain GW103 on Chinese cabbage under salt stress increased K(+)/Na(+) ratio in roots generating balance in the ratio of ion homeostasis and consequently contributed to the increase of biomass. In addition, root colonization potential of the strain was observed by green fluorescent protein (GFP)-tagging approach. These results strongly suggest the beneficial impact of strain GW103 by inducing the alleviation of salt stress and development of stress tolerance in Chinese cabbage via plant-microbe interaction.

Inter-Genera Colonization of Ocimum tenuiflorum Endophytes in Tomato and Their Complementary Effects on Na+/K+ Balance, Oxidative Stress Regulation, and Root Architecture Under Elevated Soil Salinity

“…Microbes have different mechanisms for abiotic stress management, such as maintaining Na + /K + balance ( Lee et al, 2016 ), spatial exclusion of ions via ion transporters ( Zhang et al, 2008 ), restricting Na + uptake in roots ( Ashraf et al, 2004 ; Dodd and Pérez-Alfocea, 2012 ), osmotic balance ( López-Gómez et al, 2019 ; Nadeem et al, 2020 ), membrane stability ( Bano and Fatima, 2009 ; Singh and Jha, 2016 ; Yasin et al, 2018 ; Chauhan et al, 2019 ), improved nutrient uptake ( Lee et al, 2015 ; Albdaiwi et al, 2019 ; Abdelshafy Mohamad et al, 2020 ), production of enzymatic ( Halo et al, 2015 ; Fukami et al, 2018 ) and non-enzymatic antioxidants ( Fazal and Bano, 2016 ; Singh and Jha, 2017 ), etc. Since all these effects are generally not found in a single endophyte, exploring the endophytes having different complementary mechanisms could pave the way for the inoculants having multiple mechanisms and stress-alleviating potential.…”

Volatile-Mediated Effects Predominate in Paraburkholderia phytofirmans Growth Promotion and Salt Stress Tolerance of Arabidopsis thaliana

“…Other phytohormone-related bacterial functions, like the ability to modulate indoleacetic acid (IAA) levels, have also been proposed to play a role in plant salt stress tolerance induction (Shilev et al, 2010; Wu et al, 2012; Egamberdieva et al, 2015). However, it is not easy to rule out the contribution of additional putative growth promotion functions, like the production of siderophore compounds, which is frequently observed in bacterial isolates effective in amelioration of abiotic stress (Barriuso et al, 2008; Shilev et al, 2010; Tiwari et al, 2011; Ramadoss et al, 2013; Liu and Zhang, 2015; Singh et al, 2015; Lee et al, 2016). These may act as stimulating compounds by themselves, activating a tolerance response within the plant (Aznar and Dellagi, 2015).…”

Editorial: Cell biology in agriculture and food sciences

“…The suppression of Xoo growth by a volatile terpene, (S)-limonene is reported by Lee et al (2016a). Further, Lee et al (2016b) have demonstrated the alleviation of salt stress in Brassica rapa L. ssp. perkinensis (Chinese cabbage) by Herbaspirillum sp.…”