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Enhancement of okra (Hibiscus esculentus) seedling growth and emergence by heat stress conditions

Published online by Cambridge University Press:  27 March 2009

I. C. Onwueme
I. C. Onwueme
Affiliation:
Plant Science Department, University of Ife, Ile-Ife, Nigeria
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Summary

Seeds of okra were sown in moist soil and subjected to heat stress of 45 °C for 10 h on day 0 (day of sowing), day 1 or day 2 after sowing. Stresses on day 0 and, to a lesser extent, on day 1 promoted hypocotyl elongation and accelerated seedling emergence. Stress on day 2 retarded hypocotyl elongation and did not accelerate emergence. The results were similar for seeds sown at depths of 1, 4 or 7·5 cm. For 10-h stresses on day 0, 40 °C was slightly less promotive than 45 °C; but 50 °C or above resulted in no emergence whatsoever. Subjecting dry seeds to 40–60 °C for 24 h before sowing gave no appreciable acceleration of emergence; instead, at 60 °C there was a 24-h delay in the onset of emergence. Seeds were also incubated for 1·5 h in water at temperatures ranging from 40 to 80 °C. Emergence was accelerated at 40 to 65 °C, with the greatest acceleration at 45 °C. It is suggested that incubating the seeds at 45 °C for 1·5 h before sowing could afford a practical means to accelerate field emergence of okra.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 85 , Issue 2 , October 1975 , pp. 233 - 239
Copyright
Copyright © Cambridge University Press 1975

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References

REFERENCES

Allan, R. E., Vogel, O. A. & Burleigh, J. R. (1962). Length and estimated number of coleoptile parenchyma cells of six wheat selections grown at two temperatures. Crop Science 2, 522–4.CrossRefGoogle Scholar
Burleigh, J. R., Allan, R. E. & Vogel, O. A. (1964). Effect of temperature on coleoptile elongation in eight wheat varieties and selections. Agronomy Journal 56, 523–4.CrossRefGoogle Scholar
Khan, R. A., Ahmad, S. & Hussain, S. (1973). Effects of pre-sowing high temperature stress on seedling emergence and yield of seed cotton. Experimental Agriculture 9, 9–14.CrossRefGoogle Scholar
Laude, H. M., Shrum, J. E. & Biehler, W. E. (1952). The effects of high soil temperatures on the seedling emergence of perennial grasses. Agronomy Journal 44, 110–12.CrossRefGoogle Scholar
Lawanson, A. O. & Onwueme, I. C. (1973). Effect of prior heat stress on protochlorophyll and chlorophyll formation in seedlings of Colocynthis citrullus. Zeitschrift für Pflanzenphysiologie 69, 461–3.CrossRefGoogle Scholar
Onwueme, I. C. (1974). Retardation of hypocotyl growth by prior heat stress in seedlings of cowpea, melon and tomato. Journal of Agricultural Science, Cambridge 83, 409–13.CrossRefGoogle Scholar
Onwueme, I. C. & Adegoroye, S. A. (1975). Emergence of seedlings from different depths following high-temperature stress. Journal of Agricultural Science, Cambridge 84, 525–28.CrossRefGoogle Scholar
Onwueme, I. C. & Laude, H. M. (1972). Heat-induced growth retardation and attempts at its prevention in barley and wheat coleoptiles. Journal of Agricultural Science, Cambridge 79, 331–3.CrossRefGoogle Scholar
Onwueme, I. C., Laude, H. M. & Huffaker, R. C. (1972). Nitrate reductase activity in relation to heat stress in barley seedlings. Crop Science 11, 195–200.CrossRefGoogle Scholar
Onwueme, I. C. & Lawanson, A. O. (1973). Effect of heat stress on subsequent chlorophyll accumulation in seedlings of Colocynthis citrullus. Planta 110, 81–4.CrossRefGoogle ScholarPubMed
Sunderman, D. W. (1964). Seedling emergence of winter wheats and its association with depth of sowing, coleoptile length under various conditions, and plant height. Agronomy Journal 56, 23–5.CrossRefGoogle Scholar