The curious origins of a high-stress training technique mainlining: its molecular, biochemical, and agronomic perspectives for the cultivation of Cannabis sativa

Sep 29, 2026

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Mainlining is a high-stress training (HST) technique used in Cannabis sativa cultivation to restructure plant architecture, improve canopy uniformity, and raise inflorescence yield. Despite widespread adoption, mechanistic evidence covering molecular, physiological, and agronomic pathways has been limited. This review synthesizes current knowledge on how mainlining interacts with apical dominance, shoot apical meristem (SAM) regulation, and vascular differentiation, emphasizing hormonal and metabolic shifts that support symmetrical cola development, and highlighting key research gaps and future directions for standardized protocols.

LanguageEnglish

CategoryHealthcare

FormatPDF

Pages20

Reading Time50 min

AccessFree to download

Abstract

Introduction

Cannabis sativa background and uses

Agronomic strategies for yield improvement

Low stress vs high stress training

Mainlining overview

Ijoma etal. Journal of Cannabis Research (2026) 8:3 Journal of Cannabis Research [https://doi.org/10.1186/s42238-025-00339-y](https://doi.org/10.1186/s42238-025-00339-y) REVIEW Open Access The curious origins of a high-stress training technique mainlining: its molecular, biochemical, and agronomic perspectives for the cultivation of Cannabis sativa Grace N. Ijoma 1*, Thulani Mannie 1, Weiz Nurmahomed 1, Pierre Adriaanse 1 and Memory Tekere 1 Abstract Mainlining is a high-stress training (HST) technique utilized in Cannabis sativa cultivation to restructure plant architecture, enhance canopy uniformity, and increase inflorescence yield. Despite its widespread application, scientific literature detailing the possible molecular, physiological, and agronomic mechanisms underlying this method remains limited. This review consolidates current knowledge on mainlining, focusing on its origins and its interaction with apical dominance, shoot apical meristem (SAM) regulation, and vascular differentiation. The technique involves strategic decapitation to disrupt apical dominance, initiating hormonal and metabolic shifts—particularly in auxin and sugar signalling—that stimulate axillary bud outgrowth and promote symmetrical cola development. Mainlining integrates both low-and high-stress training methods, including topping, lollipopping, and tie-downs, to optimize light distribution, canopy structure, and resource allocation. Further emphasis is placed on the role of vascular remodeling and secondary cell wall development in plant recovery and structural reinforcement following stress. The review also identifies critical research gaps, such as the absence of standardized protocols across Cannabis subspecies, and outlines future directions involving omics technologies, AI-assisted cultivation, and precision breeding. This synthesis provides a foundational reference for aligning empirical cultivation practices with plant developmental biology, contributing to the advancement of evidence-based Cannabis horticulture. Keywords Cannabis, Apical dominance, Mainlining, Stress training, Yield optimization *Correspondence: Grace N. Ijoma [ijomagn@unisa.ac.za](ijomagn@unisa.ac.za); [nkechiijoma@gmail.com](nkechiijoma@gmail.com) 1Department of Environmental Sciences, College of Agricultural and Environmental Sciences, University of South Africa, Roodepoort, FL 1709, South Africa © The Author(s) 2025. Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit [http://creativecommons.org/l](http://creativecommons.org/l)icenses/by/4.0/. Ijoma et al. Journal of Cannabis Research (2026) 8:3 Introduction Cannabis sativa is an annual dioecious herbaceous plant indigenous to Central Asia with a recorded history of at least 12,000 years. It was disseminated globally by nomadic communities (Crocq 2020). The extensive use of this plant can be attributed to its numerous functions for textile fibre, food, veterinary nutrition, cosmetics, recreational substance owing to its psychoactive characteristics, and medicine (Crini et al. 2020; Fordjour et al. 2023). Cannabis spp. offers a wide array of valuable phytochemicals, with terpenes, such as humulene, being the most renowned for their aromatic qualities

FAQs

What is mainlining in Cannabis sativa cultivation?

Mainlining is a high-stress training technique that restructures plant architecture to improve canopy uniformity and increase inflorescence yield by promoting symmetrical cola development.

How does mainlining work mechanistically according to the review?

Strategic decapitation disrupts apical dominance, triggering hormonal and metabolic shifts—especially auxin and sugar signalling—so axillary buds grow and colas develop symmetrically.

What research gaps and future directions does the review identify?

The review highlights the lack of standardized protocols across Cannabis subspecies and proposes future work using omics technologies, AI-assisted cultivation, and precision breeding.

Sep 29, 2026

Uploaded by Terk