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Productivity effects of single plant growth promoting rhizobacterium inoculation on Cannabis sativa L. morphological development and flower yield
  • Dongmei Lyu,
  • Rachel Backer,
  • D.L. Smith
Dongmei Lyu
McGill University
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Rachel Backer
McGill University
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D.L. Smith
Plant Science Department, McGill University, 21111 Lakeshore Road, Ste. Anne de Bellevue, Quebec, Canada H9X3V9

Corresponding Author:[email protected]

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The legalization of cannabis and awareness of its end-use applications has resulted in the renewed consumer demand. An important challenge is achievement of high yield with minimum input for indoor production. The beneficial phytomicrobiome as a sustainable approach gives its potential and ability to enhance plant growth has already been evaluated for a range of plants. This study evaluated three individual plant growth promoting rhizobacterium (PGPR, Bacillus sp., Mucilaginibacter sp. and Pseudomonas sp.) on cannabis (cv. CBD Kush) cuttings’ root development and subsequent plant growth. Our hypothesis was that the PGPR would improve rooting speed of cuttings, yield attributes, and physiological variables. When compared to control (mock inoculation with MgSO4), inoculation with PGPR increased root length at vegetative stage and enhanced flower fresh weight by 5.13%, 6.94% and 11.45%, inoculating with Bacillus sp., Mucilaginibacter sp. and Pseudomonas sp. respectively. While the plant height, node number, branch number and leaf area treated with PGPR was rarely different from control. Throughout growth (vegetative and reproductive), inoculation with Pseudomonas sp. resulted in the greatest increase in photosynthetic rate. Future research should investigate the effects of PGPR on the cannabinoid profile and the effect of various cell densities at inoculation, or different inoculation timings.