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Effects of gibberellic acid and abscisic acid on α-amylase activity and ultrastructure of aleurone cells ofAvena sativa L.

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Abstract

The effects of GA3 and/or ABA on the α-amylase activity and the ultrastructure of aleurone cells in halves of seeds without embryos (embryo-less half seeds) of oats (Avena sativa L.) were studied.

α-Amylase activity was detected by the starch-agar gel method in the aleurone layers of embryo-less half seeds soaked in 1 μM GA3 solution or 100 μM GA3+10 μM ABA solution but not in those of seeds soaked in distilled water, 10 μM ABA solution, or 1 μM GA3+10 μM ABA solution. Ultrastructural examinations of aleurone cells with α-amylase activity showed a decrease in the number of sphaerosomes, the appearance of flattened saccules pressed to the surface of aleurone grains, and the development and transformations of the rER from a slender form to the one with wide inner spaces. In the aleurone cells in which the enzyme activity was not detected, components of the rER showed only slender profiles. The number of sphaerosomes did not decrease, and no flattened saccules appeared in the aleurone cells treated with 10 μM ABA or 1 μM GA3+10 μM ABA.

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Abbreviations

ABA:

abscisic acid

GA3 :

gibberellin A3

rER:

rough surfaced endoplasmic reticulum

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Authors and Affiliations

  1. Department of Biology, Faculty of Science, Nara Women's University, 630, Nara

    Aiko Sakai-Wada & Shigeno Kaneko

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  1. Aiko Sakai-Wada
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  2. Shigeno Kaneko
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Sakai-Wada, A., Kaneko, S. Effects of gibberellic acid and abscisic acid on α-amylase activity and ultrastructure of aleurone cells ofAvena sativa L.. Bot. Mag. Tokyo 102, 463–469 (1989). https://doi.org/10.1007/BF02488128

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  • DOI: https://doi.org/10.1007/BF02488128

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