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Sieve-Element Plastids, Exine Sculpturing and the Systematic Affinities of the Buxaceae

H.-Dietmar Behnke
Plant Systematics and Evolution
Vol. 139, No. 3/4 (1982), pp. 257-266
Published by: Springer
Stable URL: http://www.jstor.org/stable/23642713
Page Count: 10
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Sieve-Element Plastids, Exine Sculpturing and the Systematic Affinities of the Buxaceae
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Abstract

The sieve-element plastids of members of several genera in the Buxaceae (Buxus, Pachysandra and Sarcococca) were found to be of the specific subtype PVI, which contains a central globular protein crystal. Simmondsia (Simmondsiaceae) and Daphniphyllum (Daphniphyllaceae), on the other hand, were found to contain S-type sieve-element plastids. The occurrence of the highly restricted PVI plastids in the Buxaceae mitigates against a close relationship between the Buxaceae and Simmondsia, Daphniphyllum and Euphorbiaceae. Exine sculpturing of the Buxaceae and Simmondsiaceae also shows no close similarities. Both of these EM characters are discussed in connection with other available data and with respect to earlier systematic treatment of these families.

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