Selection of PGPR Which Promotes the Growth of Spinach

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  • ホウレンソウに対するPGPRの検索
  • ホウレンソウ ニ タイスル PGPR ノ ケンサク

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Abstract

Recently, soil sickness due to continuous mono-cropping has become a serious problem in greenhouse culture. In the case of leaf vegetables produced in the greenhouse, problem is compounded by intensive cropping. For such a problem, the establishment of a rotational cropping system is a fundamental solution method. But it is important to develop specialized technology which extends the possible period for continuous cropping. Rhizobacteria have the potential to be useful in agriculture for plant disease control and plant growth promotion. Plant growth-promoting rhizobacteria (PGPR) are soil bacteria that, when applied to seeds or roots, are able to colonize plant roots and stimulate plant growth. Strains of fluorescent pseudomonads, particularly Pseudomonas putida and Pseudomonas fluorescens, belong to a major group of PGPR. In this study, we selected PGPR which promoted the growth of the spinach. 1) We selected PGPR with the function of promoting the elongation of spinach root using the smallscale sterilized hydroponic culture bioassay system. 2) Several fluorescent pseudomonad strains which promoted around 50% increase in growth (aboveground and at the root) of the spinach were obtained. 3) Strains selected as PGPR were separated into 2 types. Type A accelerates the growth of the spinach root from the initial growth stage. Type B suppresses the growth of initial infant spinach root growth. 4) In the hydroponic culture, inoculated Pseudomonas spp. colonized satisfactorily on the spinach root. In the case of PGPR having sufficiently colonized on the root, the growth-promoting effect of PGPR on the spinach could be demonstrated. 5) In the case of diluted liquid of the type B culture being applied to the bioassay, growth suppression at the early stage disappeared. Therefore, the growth-promoting mechanism of type B was thought to be related to bacteria] secretion or microorganism metabolite.

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