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A brief temperature pulse enhances the competency of microspores for androgenesis in Datura metel

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Abstract

Androgenesis may be induced in plants by a stress application on microspores or anthers. Temperature stress treatments have generally been confined to a single temperature regime (above or below ambient) lasting from a few hours to days. We introduced a gradient with two temperature pulses (30 s each) in the stress application on anthers of Datura metel L. by stepping the temperature up and down for a total period of 60 s. Anthers were immersed in sterile water preheated and cooled to the desired temperature and cultured on Nitsch medium. The temperature pulse gradient significantly improved androgenesis compared to single temperature treatments, resulting in increased mean embryogenesis of 128% over control for 45°/15°C, 110% for 45°/10°C, 113% for 40°/10°C and 96% for 45°/5°C. The 45°/10°C gradient also significantly increased the number of dividing microspores observed, after 14 days of anther culture. Besides the differential of the gradient, the temperature limit was important, with anthers not tolerating temperatures beyond 45°C. The temperature pulse gradient applied at an early stage of culture may increase the window of competency of microspores for androgenesis.

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Acknowledgements

We wish to acknowledge the assistance of Mr. R. B. Hapukotuwa in the greenhouse, Dr. Kopisch-Obuch for statistical advice, the late Prof. Aries Kovoor for invaluable discussions, and an anonymous reviewer for helpful comments.

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  1. Plant Reproductive Biology, Institute of Fundamental Studies, Hantane Road, Kandy, Sri Lanka

    Mohamed C. M. Iqbal & Kolitha B. Wijesekara

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  1. Mohamed C. M. Iqbal
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  2. Kolitha B. Wijesekara
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Correspondence to Mohamed C. M. Iqbal.

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Iqbal, M.C.M., Wijesekara, K.B. A brief temperature pulse enhances the competency of microspores for androgenesis in Datura metel . Plant Cell Tiss Organ Cult 89, 141–149 (2007). https://doi.org/10.1007/s11240-007-9222-7

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