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rhizoplane microbiota of superior wheat varieties possess enhanced plant growth-promoting abilities

Frontiers in Biology 2016年第6期11卷 481-487页

作者： Ayesha Siddiqa Yasir Rehman Shahida Hasnain Department of Microbiology and Molecular Genetics University of the Punjab Lahore Pakistan The Women University Multan Multan Pakistan

BACKGROUND： Microbes affect the growth of plants. In this study, the diversity and plant growth-supporting activities of wheat rhizospheric bacteria were examined. METHODS： Sampling was performed thrice at different phases of plant growth. Microbes associated with the rhizoplane of three wheat varieties （Seher, Lasani, and Faisalabad） were cultured and assessed for their plant growth-promoting abilities based on auxin production, hydrogen cyanide production, phosphate solubilization, and nitrogen fixation. RESULTS： Bacterial load （CFU/mL） declined, and the succession of bacterial diversity occurred as the plants aged. Most auxin-producing bacteria and the highest concentrations of auxin （77 ~tg/mL） were observed during the second sampling point at the filleting stage. The Seher variety harbored the most auxin-producing as well as phosphate-solubilizing bacteria. Most of the bacteria belonged to Bacillus and Pseudomonas. Planomicrobium, Serratia, Rhizobium, Brevundimonas, Stenotropho- monas, and Exiguobacterium sp. were also found. CONCLUSIONS： These results suggest that the rhizoplane microbiota associated with higher-yield plant varieties have better plant growth-promoting abilities as compared to the microbiota associated with lower-yield plant varieties.

关键词： wheat microbiota rhizoplane auxin phosphate solubilization

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Signaling at the Root Surface： The Role of Cutin Monomers in Mycorrhization

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Molecular Plant 2013年第5期6卷 1381-1383页

作者： Jeremy D. Murray Donna R. Cousins Kirsty J. Jackson Chengwu Liu Cell and Developmental Biology John Innes Centre Norwich NR4 7UH UK

Most vascular plants interact with arbuscular mycorrhizal fungi （AMF） and are thereby provided significant advantages in nutrient acquisition, especially phosphate. The widespread retention of this symbiosis in vascular plants is testament to its importance and ancient origins. This highlight focuses on the reports of two of the first genes identified through for- ward genetic screens for AMF symbiotic mutants： Required for Abuscular Mycorrhization 1 （RAM1） and RAM2, which respectively encode a GRAS transcription factor and a glyc- erol-3-phosphate acyl-transferase （GPAT） that are required for the formation of fungal entry structures （hyphopodia） on the root surface.

关键词： rhizoplane MYCORRHIZAS Crucial components Signal Transduction monomers cutin Oomycetes signals butter oil Glycerol-3-Phosphate O-Acyltransferase

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