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The effect of abscisic acid on the differential expression of α-amylase isozymes in barley aleurone layers

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Summary

The treatment of barley aleurone layers with gibberellic acid (GA3) results in the synthesis of two groups of α-amylase isozymes. Addition of abscisic acid (ABA) at the same time as GA3 inhibited the synthesis of both groups of isozymes. However, midcourse ABA addition (12 h or later after GA3) had a more inhibitory effect on the high pI α-amylase group than on the low pI α-amylase group. This midcourse inhibition was detectable within 2 h of ABA addition. Northern analysis results using cDNA probes for the high pI and low pI α-amylase groups paralleled the protein synthesis results for both isozyme groups. High pI α-amylase mRNA levels began to decrease within 2 h of midcourse ABA treatment and were less than 10% of the original level by 4 h. The levels of low pI α-amylase mRNA were decreased less by midcourse ABA addition than were high pI mRNA levels. Cordycepin and cycloheximide blocked the effects of midcourse ABA addition on α-amylase mRNA. These observations indicate that ABA inhibits α-amylase expression at the pretranslational level and that protein and RNA synthesis are required for midcourse ABA action to occur. Our results also show that α-amylase mRNA, which has been thought to be very stable, is degraded after midcourse ABA treatment.

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Authors and Affiliations

  1. Department of Biology, Washington University, 63130, St. Louis, MO, U.S.A.

    Randall C. Nolan, Liang-Shiou Lin & Tuan-hua David Ho

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  1. Randall C. Nolan
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  2. Liang-Shiou Lin
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  3. Tuan-hua David Ho
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Nolan, R.C., Lin, LS. & Ho, Th.D. The effect of abscisic acid on the differential expression of α-amylase isozymes in barley aleurone layers. Plant Mol Biol 8, 13–22 (1987). https://doi.org/10.1007/BF00016430

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  • DOI: https://doi.org/10.1007/BF00016430

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