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Conservation of aromatic medicinal plant Rheum emodi through improved seed germination

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Rheum emodi Wall. ex Meissn (Polygonaceae) is a plant of Garhwal Himalaya reported to be endangered due to over-exploitation for medicinal use and poor seed germination and seedling survival in nature. To determine the optimum germination conditions for this Himalayan medicinal herb, seeds were hot-water pre-treated (80°C then cooling overnight), cold-water pre-treated (10°C left overnight) or placed in a range of gibberellic acid (GA3) concentrations (0.3, 0.6, 0.9 μM) for 24 h. Control seeds were untreated. The seeds were subjected to two light regimes (16:8 h alternate light:dark and continuous dark) at three temperatures (15, 20, 25°C). The highest germination (83.3%) occurred following hot-water pre-treatment and incubation under 16:8 h alternate light:dark conditions at 15°C, with a reduced mean germination time (MGT) of 8 d. The second highest germination (80%) was recorded under dark conditions at 15°C with cold-water pre-treatment with MGT of 11.3 d. The present study indicates a low germination temperature (≥ 15°C), which is the normal temperature in the study area, and light for improved seed germination of R. emodi. Farmers can also use hot-water pre-treatment prior to sowing the seeds.
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Document Type: Research Article

Publication date: 01 April 2012

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  • Seed Science and Technology (SST) is one of the leading international journals featuring original papers and review articles on seed quality and physiology as related to seed production, harvest, processing, sampling, storage, distribution and testing. This widely recognised journal is designed to meet the needs of researchers, advisers and all those involved in the improvement and technical control of seed quality.
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