Agronomic, phytochemical and drought tolerance evaluation of Iranian cannabis (Cannabis sativa L.) ecotypes under different soil moisture levels: a step towards identifying pharmaceutical and industrial populations
Sadegh Asadi A , Hosein Moghaddam A , Hassanali Naghdi Badi
B C * , Mohammad Reza Naghavi A and Seyed Alireza Salami D
+ Author Affiliations
- Author Affiliations
A Department of Agronomy and Plant Breeding, Faculty of Agriculture & Natural Resources, University of Tehran, Karaj, Iran.
B Department of Agronomy and Plant Breeding, Faculty of Agriculture, Shahed University, Tehran, Iran.
C Medicinal Plants Research Center, Shahed University, Tehran, Iran.
D Department of Horticultural Science, Faculty of Agriculture & Natural Resources, University of Tehran, Karaj, Iran.
* Correspondence to: Naghdibadi@yahoo.com, Naghdibadi@shahed.ac.ir
Handling Editor: Zakaria Solaiman
Crop & Pasture Science 74(12) 1238-1257 https://doi.org/10.1071/CP22212
Submitted: 19 June 2022 Accepted: 10 March 2023 Published: 14 April 2023
© 2023 The Author(s) (or their employer(s)). Published by CSIRO Publishing
Abstract
Context: Cannabis is a herbaceous annual plant that belongs to the Cannabaceae family, which is used in the production of fibre, paper, oil and pharmaceutical products.
Aims: The aim of this study was to identify drought-tolerant ecotypes and medicinal and industrial populations.
Methods: Due to the medicinal and industrial importance of cannabis, 12 cannabis ecotypes were collected from different regions of Iran. Then, their agronomic and phytochemical characteristics were evaluated under different soil moisture conditions.
Key results: The soil moisture levels had significant effects (P < 0.01) on the studied traits except for the 1000 seed weight. Based on duration of the growth period, the Tabas and Dasht-e-Moghan ecotypes were identified as early and late maturing ecotypes, respectively. Also, the highest stem dry weight and stem height/diameter ratio and the lowest seed yield were related to the Dasht-e-Moghan ecotype, which is valuable for fibre production. Based on seed yield (relative reduction) and some tolerance indexes, the Tabas and Tabrize ecotypes were shown to be the most tolerant and sensitive ecotypes, respectively. As soil moisture decreased, tetrahydrocannabinol levels increased and cannabidiol levels decreased. The highest amount of tetrahydrocannabinol was related to the Qom ecotype at 50% soil moisture and the highest amount of cannabidiol was related to the Rasht ecotype at 100% soil moisture.
Conclusions: Generally, these ecotypes had different responses to soil moisture. Some ecotypes were valuable in terms of the production of pharmaceutical metabolites and some in terms of fibre production.
Implications: Tolerant and sensitive ecotypes might be considered in production and also breeding programs.
Keywords: cannabidiol, Cannabis sativa L., drought stress, ecotype, growth period duration, sensitivity indices, soil moisture, tetrahydrocannabinol, tolerance indices.
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