Meyers, S.P. and Nelson, C.J. and Horrocks, R.D. (1984) Temperature effects on imbibition, germination and respiration of grain sorghum seeds. Field Crops Research, 8 (1-2). pp. 135-142.
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Abstract
Seeds of grain sorghum (Sorghum bicolor (L.) Moench) were used to assess effects of imbibitional temperatures on germination, radicle length, emergence, and development of respiratory activity. Germination in soil after 6 days at 25, 20 and 15°C was about 90%. Seeds at 10°C for the first 24 hours, and then at 25°C (10/25°C) also germinated about 90%. However, seeds held continuously at 10°C absorbed sufficient moisture, but failed to germinate within 5 days. Rates of germination and radicle elongation increased when temperature increased from 15 to 25°C. Radicle elongation was slower and emergence was later for seedlings at 10/25°C than that for seeds imbibed and grown throughout at 25°C. In contrast to radicle elongation at 10/25°C was intermediate between that at 15 and 20°C, percentage emergence at 10/25°C was intermediate between 20 and 25°C. These results suggested that radicle growth was more sensitive to imbibitional chilling than was growth of the coleoptile and epicotyl. Respiration rates during imbibition at 10 and 6°C were low, and increased slowly in a linear manner over time as seeds imbibed water. Respiration rates at the higher inbibitional temperatures were progressively higher, and increased in a curvilinear manner as water was imbibed. Seeds at 31% moisture had respiration rates of 186, 83, 57, 22, and 10 μl O2 h−1 g−1 for the 25, 20, 15, 10, and 6°C treatments, respectively. Although seeds imbibed water at 6 and 10°C reaching the moisture content necessary for germination, they did not germinate
| Item Type: | Article |
|---|---|
| Author Affiliation: | Department of Agronomy, Missouri Univversity, Columbia, Mo 65211, USA |
| Subjects: | Plant Physiology and Biochemistry > Plant Physiology Plant Physiology and Biochemistry > Biochemistry |
| Divisions: | Sorghum |
| Depositing User: | Ms K Syamalamba |
| Date Deposited: | 25 Mar 2013 10:53 |
| Last Modified: | 25 Mar 2013 10:53 |
| Official URL: | http://dx.doi.org/10.1016/0378-4290(84)90057-1 |
| URI: | http://eprints.icrisat.ac.in/id/eprint/10007 |
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