title: Promoting effects of a single Rhodopseudomonas palustris inoculant on plant growth by Brassica rapa chinensis under low fertilizer input.
abstract: Several Rhodopseudomonas palustris strains have been isolated from rice paddy fields in Taiwan by combining the Winogradsky column method and molecular marker detection. These isolates were initially screened by employing seed germination and seedling vigor assays to evaluate their potential as inoculants. To fulfill the demand in the present farming system for reducing the application of chemical fertilizers, we assessed the plant growth-promoting effects of the R. palustris YSC3, YSC4, and PS3 inoculants on Brassica rapa chinensis (Chinese cabbage) cultivated under a half quantity of fertilizer. The results obtained showed that supplementation with approximately 4.0×10(6) CFU g(-1) soil of the PS3 inoculant at half the amount of fertilizer consistently produced the same plant growth potential as 100% fertility, and also increased the nitrogen use efficiency of the applied fertilizer nutrients. Furthermore, we noted that the plant growth-promotion rate elicited by PS3 was markedly higher with old seeds than with new seeds, suggesting it has the potential to boost the development of seedlings that were germinated from carry-over seeds of poor quality. These beneficial traits suggest that the PS3 isolate may serve as a potential PGPR inoculant for integrated nutrient management in agriculture.
authors.affiliation: Department of Agronomy, National Taiwan University.
authors.forename: Wai-Tak
authors.initials: WT
authors.lastname: Wong
authors.forename: Ching-Han
authors.initials: CH
authors.lastname: Tseng
authors.forename: Shu-Hua
authors.initials: SH
authors.lastname: Hsu
authors.forename: Huu-Sheng
authors.initials: HS
authors.lastname: Lur
authors.forename: Chia-Wei
authors.initials: CW
authors.lastname: Mo
authors.forename: Chu-Ning
authors.initials: CN
authors.lastname: Huang
authors.forename: Shu-Chiung
authors.initials: SC
authors.lastname: Hsu
authors.forename: Kung-Ta
authors.initials: KT
authors.lastname: Lee
authors.forename: Chi-Te
authors.initials: CT
authors.lastname: Liu
mesh_terms: D059827:Agricultural Inoculants / Q000378:metabolism*; D001937:Brassica / Q000254:growth & development* / Q000378:metabolism / Q000382:microbiology*; D005308:Fertilizers / Q000032:analysis*; D009584:Nitrogen / Q000032:analysis / Q000378:metabolism; D010758:Phosphorus / Q000032:analysis / Q000378:metabolism; D012241:Rhodopseudomonas / Q000378:metabolism*; D012987:Soil / Q000737:chemistry; D012988:Soil Microbiology; D013624:Taiwan
chemical_list: D005308:Fertilizers; D012987:Soil; D010758:Phosphorus; D009584:Nitrogen