Seed coat imposed dormancy in Sesbania spp. and treatments to improve germination
Sesbania Scop. genus (Leguminosae) commonly known as Dhanicha is the most promising green manure crop in rice wheat cropping System of India. Most of the leguminous seeds including those of Sesbania possess high proportion of hard seeds due to impermeable seed coat, limiting their field emergence as well as germination in the laboratory conditions. Germination studies involving a total of 689 seed samples belonging to both indigenous and exotic collections showed variation in the percentage occurrence of hard seeds. Different methods such as chemical scarification with concentrated sulphuric acid for 20, 40 and 60 minutes, hot water treatment at 80°C for five minutes, boiling water treatment at 100°C for ten seconds and hot/cold water dipping (shock treatment) were tried to improve the germination in this species. The results obtained showed that 40-60 minutes acid scarification was most effective in completely eliminating the hard seeds and at the same time not affecting the vigour and viability of the treated seeds. The duration of acid treatment required to be adjusted depending upon the percentage of hard seeds present which varied from genotypes to genotypes. Hot water treatment was less effective and proved deleterious resulting in increased percentage of abnormal or dead seeds.
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Document Type: Research Article
Publication date: July 1, 2007
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