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Spatial and temporal regulation of DNA fragmentation in the aleurone of germinating barley

Mei Wang,B. Oppedijk,Martien Caspers,Gerda E. M. Lamers,Marit J. Boot,Dave N.G. Geerlings,Bob Bakhuizen,Annemarie H. Meijer,Bert van Duijn

Aleurone

Endosperm

Fragmentation (computing)

1998

During germination of barley grains, the appearance of DNA fragmentation started in aleurone cells near the embryo and extended to the distal end in a timedependent manner. DNA fragmentation was demonstrated to occur only after the expression of a-amylase mRNA in the aleurone layer. In addition, cell wall degradation started in cells near the embryo on the sides facing the endosperm. Subsequently cell wall degradation extended to the lateral cell walls and to cells more to the distal end of the grain. A typical alteration of the nucleus was observed by electron microscopy and an almost complete degradation of DNA was found in the nucleus while the nuclear envelope remained intact. The results indicate that programmed cell death occurred in aleurone cells during germination. A model is proposed for the regulation of programmed cell death in aleurone cells during germination involving ABA levels and cell wall degradation.

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“Spatial and temporal regulation of DNA fragmentation in the aleurone of germinating barley” is a paper by Mei Wang B. Oppedijk Martien Caspers Gerda E. M. Lamers Marit J. Boot Dave N.G. Geerlings Bob Bakhuizen Annemarie H. Meijer Bert van Duijn published in 1998. It has an Open Access status of “bronze”. You can read and download a PDF Full Text of this paper here.