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Open AccessArticle

Impact of Different Phytohormones on Morphology, Yield and Cannabinoid Content of Cannabis sativa L.

1
Department of Agronomy, Institute of Crop Science, Cropping Systems and Modelling, University of Hohenheim, 70599 Stuttgart, Germany
2
Department of Agronomy, Institute of Crop Science, Biostatistics, University of Hohenheim, 70599 Stuttgart, Germany
3
Ai Fame GmbH, 9105 Wald-Schönengrund, Switzerland
*
Author to whom correspondence should be addressed.
Plants 2020, 9(6), 725; https://doi.org/10.3390/plants9060725
Received: 22 May 2020 / Revised: 5 June 2020 / Accepted: 5 June 2020 / Published: 8 June 2020
The impact of exogenously applied plant growth regulators (PGR), 1-naphthalenaecetic acid (NAA), 6-benzylaminopurine (BAP), and a mixture of both (NAA/BAP-mix), was investigated in regard to plant height, length of axillary branches, number of internodes, biomass yield and cannabinoid content of three different phytocannabinoid-rich (PCR) Cannabis genotypes. The results showed that total plant height was significantly reduced under the application of NAA (28%), BAP (18%), and NAA/BAP-mix treated plants (15%). Axillary branch length was also significantly reduced by 58% (NAA) and 30% (NAA/BAP-mix). BAP did not significantly reduce the length of axillary branches. The number of internodes was reduced by NAA (19%), BAP (10%), and the NAA/BAP-mix (14%) compared to the untreated control. NAA application influenced the plant architecture of the tested cv. KANADA beneficially, resulting in a more compact growth habitus, while inflorescence yield (23.51 g plant−1) remained similar compared to the control (24.31 g plant−1). Inflorescence yield of v. 0.2x and cv. FED was reduced due to PGR application while cannabinoid content remained stable. Overall, the application of PGR could be used on a genotype-specific level to beneficially influence plant architecture and optimize inflorescence yield per unit area and thus cannabinoid yield, especially in the presence of space limitations under indoor cultivation. View Full-Text
Keywords: Cannabis sativa L.; growth regulators; indoor growth; plant morphology; length of axillary branches; number of internodes; plant height; biomass yield; cannabinoids Cannabis sativa L.; growth regulators; indoor growth; plant morphology; length of axillary branches; number of internodes; plant height; biomass yield; cannabinoids
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MDPI and ACS Style

Burgel, L.; Hartung, J.; Schibano, D.; Graeff-Hönninger, S. Impact of Different Phytohormones on Morphology, Yield and Cannabinoid Content of Cannabis sativa L. Plants 2020, 9, 725. https://doi.org/10.3390/plants9060725

AMA Style

Burgel L, Hartung J, Schibano D, Graeff-Hönninger S. Impact of Different Phytohormones on Morphology, Yield and Cannabinoid Content of Cannabis sativa L. Plants. 2020; 9(6):725. https://doi.org/10.3390/plants9060725

Chicago/Turabian Style

Burgel, Lisa; Hartung, Jens; Schibano, Daniele; Graeff-Hönninger, Simone. 2020. "Impact of Different Phytohormones on Morphology, Yield and Cannabinoid Content of Cannabis sativa L." Plants 9, no. 6: 725. https://doi.org/10.3390/plants9060725

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