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Mechanical and enzymatic separation of ripening rice (Oryza sativa L.) caryopsis tissues

Published online by Cambridge University Press:  22 February 2007

Jordan O. Hay  and
Roger M. Spanswick
Jordan O. Hay*
Affiliation:
Department of Biological and Environmental Engineering, Cornell University, Ithaca, New York 14853-5701, USA
Roger M. Spanswick*
Affiliation:
Department of Biological and Environmental Engineering, Cornell University, Ithaca, New York 14853-5701, USA
*
†Current address: Division of Bioscience and Bioinformatics, Myongji University, Yongin 449–728, Korea.
*Correspondence: Fax: +1 607 255 4080 Email: rms6@cornell.edu
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Abstract

The ripening rice (Oryza sativa L.) caryopsis contains several maternal and embryonic tissues that transport assimilates along the partitioning pathway. Experimental access to transport steps in the pathway is limited by the separability of the tissues. Hence, the extent to which tissues can be mechanically and enzymatically separated was assessed. The caryopsis coat was isolated during mid-ripening, dissected and microscopically characterized. In centripetal order, the pericarp (epidermis, parenchyma-cell layer, cross-cell layer, tube-cell layer), inner integument, nucellar epidermis, aleurone layer and subaleurone layer adhered to each other. There was mechanical separation at the tube-cell layer, but not at the maternal/embryonic interface. Aleurone- and subaleurone-layer cells exposed on the inner surface of isolated caryopsis coats were macerated with Pectolyase Y-23 and manually sheared, which freed the endosperm and exposed the nucellar epidermis. Yield of endosperm cells increased linearly with the number of coats and reached a maximum after 1 h. The proportion of cells that were viable was approximately 10%. Subaleurone-layer cells contributed less than 25% to the yield. These results suggest that pectin polymers are necessary for adherence between the nucellar epidermis and the aleurone layer, and that enzymatic maceration is useful for separating the tissues at the maternal/embryonic interface.

Keywords

adhesioncaryopsis coatcell isolationgrain ripeningmacerationOryza sativarice
Type
Short Communication
Information
Seed Science Research , Volume 16 , Issue 3 , September 2006 , pp. 223 - 227
Copyright
Copyright © Cambridge University Press 2006

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