Autochthonous halotolerant plant growth-promoting rhizobacteria promote bacoside A yield of Bacopa monnieri(L.)Nash and phytoextraction of salt-affected soil  

作　　者：Umesh PANKAJ Durgesh Narain SINGH Pooja MISHRA Pooja GAUR C.S.Vivek BABU Karuna SHANKER Rajesh Kumar VERMA 

机构地区：[1]Department of Soil Science,CSIR-Central Institute of Medicinal and Aromatic Plants,Lucknow 226015(India) [2]Division of Biotechnology,CSIR-Central Institute of Medicinal and Aromatic Plants,Lucknow 226015(India) [3]Division of Microbial Technology,CSIR-Central Institute o f Medicinal and Aromatic Plants,Lucknow 226015(India) [4]Analytical Chemistry Department,CSIR-Central Institute o f Medicinal and Aromatic Plants,Lucknow 226015(India) [5]Research Centre,CSIR-Central Institute of Medicinal and Aromatic Plants,Bangalore 560065(India)

出　　处：《Pedosphere》2020年第5期671-683,共13页土壤圈（英文版）

摘　　要：Phytoremediation is a promising approach for reclamation of salt-affected soil.Phytoextraction is the most commonly used process,which exploits plants to absorb,immobilize,and accumulate salt in their shoots.In this study,halotolerant plant growth-promoting rhizobacteria(PGPR)were isolated from the rhizosphere of wild grasses growing naturally in salt-affected areas of Lucknow,Uttar Pradesh(India)and were tested for their efficacies of salt-tolerance and plant growth-promoting(PGP)abilities.Based on 16S rRNA sequences,the most efficient halotolerant isolates possessing PGP traits were identified as Pseudomonas plecoglossicida(KM 233646),Acinetobacter calcoaceticus(KM 233647),Bacillus flexus(KM 233648),and Bacillus safensis(KM 233652).Application of these isolates as bio-inoculants significantly(P<0.05)increased the growth and bacoside A yield of a medicinal plant,Bacopa monnieri(L.)Nash,grown on natural salt-affected soil.The phytoremediation of salt-affected soil was evident by the substantial increase in shoot Na^+:K^+ratio of bio-inoculant-treated plants.When compared to un-inoculated control plants,the soil physico-chemical properties of bio-inoculant-treated plants were improved.The shoot and root biomass(fresh and dry weights),soil enzymes,and soil nutrient parameters showed significant positive correlations with the shoot Na+:K+ratio.Consequently,the halotolerant PGPR screened in this study could be useful for the reclamation of saline soils concomitant with improved plant growth and bacoside A yield.

关 键 词：bio-inoculant PHYTOREMEDIATION plant productivity soil physico-chemical property soil salinity 

分 类 号：Q945[生物学—植物学]