NDLI: Promotion of tomato (Lycopersicon esculentum Mill.) plant growth by rhizosphere competent 1-aminocyclopropane-1-carboxylic acid deaminase-producing streptomycete actinomycetes

Content Provider	Springer Nature Link
Author	El Tarabily, Khaled A.
Copyright Year	2008
Abstract	The ability of streptomycete actinomycetes to promote growth of tomato through the production of 1-aminocyclopropane-1-carboxylic acid (ACC) deaminase was evaluated under gnotobiotic and greenhouse conditions. To achieve this, 64 isolates of Streptomyces spp. obtained from a tomato rhizosphere in the United Arab Emirates were initially selected for their ability to produce ACC deaminase as well as indole-3-acetic acid (IAA) and subsequently for their rhizosphere competence as root colonizers. Of the two selected ACC deaminase-producing isolates showing exceptional rhizosphere competence, S. filipinensis no. 15 produced both ACC deaminase and IAA, whilst S. atrovirens no. 26 did not produce IAA. Under greenhouse conditions, the application of S. filipinensis no. 15 or S. atrovirens no. 26 resulted in the reduction of the endogenous levels of ACC, the immediate precursor of ethylene, in both roots and shoots and increased plant growth. Plant growth promotion was most pronounced in the presence of S. filipinensis no. 15 compared to S. atrovirens no. 26. This relative superiority in performance shows the advantage conferred to S. filipinensis no. 15 due to its ability to produce both IAA and ACC deaminase. In comparison, an ACC deaminase-producing isolate of S. albovinaceus no. 41 which was neither rhizosphere-competent nor capable of producing IAA, failed to promote plant growth compared to S. filipinensis no. 15 or S. atrovirens no. 26 although the growth promotion obtained by S. albovinaceus no. 41 was significant compared to control. The application of S. globosus no. 8, which was not rhizosphere-competent and did not produce detectable levels of ACC deaminase or IAA did not promote plant growth. These results indicate the importance of rhizosphere competence. In conclusion I report the production of ACC deaminase by streptomycete actinomycetes and its ability to enhance plant growth through reduction in the in planta levels of endogenous ACC and the consequent lowering of endogenous ethylene levels in plant tissues.
Starting Page	161
Ending Page	174
Page Count	14
File Format	PDF
ISSN	0032079X
Journal	Plant and Soil
Volume Number	308
Issue Number	1-2
e-ISSN	15735036
Language	English
Publisher	Springer Netherlands
Publisher Date	2008-05-16
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Actinomycetes Auxins Biological fertilizers Ethylene Plant growth-promoting rhizobacteria Rhizosphere competence Soil fertility Ecology Plant Physiology Soil Science & Conservation Plant Sciences
Content Type	Text
Resource Type	Article
Subject	Soil Science Plant Science

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