Overcoming physiological dormancy in Ceropegia odorata seeds, an endangered rare species, with GA3, H2O2 and KNO3
Ceropegia odorata, a threatened endemic species of India with medicinal properties, germinate with difficulty since its seeds possess physiological dormancy. The present study was carried out to investigate whether exogenous application of GA3, H2O2 and KNO3 could be used to alleviate dormancy. Dormant seeds of C. odorata showed slight (7% germination) loss of dormancy 80 days after storage (DAS), and reached 100% after 365 DAS, during after-ripening. Of the three chemicals evaluated for dormancy-breaking properties, H2O2 (0.1%) promoted germination up to 62% followed by 51% in 150 ppm of GA3 in dormant seeds (0 DAS). The KNO3 treatment was unable to break dormancy in fresh dormant seeds but was effective in seeds air-dried for 35 DAS (8% germination). Absolute loss of dormancy was obtained most rapidly in H2O2 (80 DAS) followed by GA3 (130 DAS). Compared with control, the total number of days required for non-dormant seeds of C. odorata to germinate was 5, 5 and 8 days, respectively, after GA3, H2O2 and KNO3 treatment. It is concluded that the percentage of germination in absolutely dormant seeds and rate of germination in non-dormant seeds of C. odorata was promoted most by exogenously applied H2O2, followed by GA3 and KNO3.
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Document Type: Research Article
Publication date: July 1, 2010
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