Starch-accumulating (S-type) sieve-element plastids in Hydatellaceae: implications for plastid evolution in flowering plants

TEM investigation of sieve-element plastids in three species of Trithuria, the sole genus of the small aquatic family Hydatellaceae, show that P-type plastids are absent from this genus and only starch-accumulating (S-type) sieve-element plastids are present. This discovery is consistent with the re...

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Bibliographic Details
Published in:Protoplasma 2009-10, Vol.237 (1-4), p.19-26
Main Authors: Tratt, Julia, Prychid, Christina J, Behnke, H.-Dietmar, Rudall, Paula J
Format: Article
Language:English
Subjects:
Biomedical and Life Sciences
Cell Biology
Life Sciences
Magnoliopsida
Original Article
Phylogeny
Plant Sciences
Plastids
Plastids - genetics
Starch
Zoology
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Summary:TEM investigation of sieve-element plastids in three species of Trithuria, the sole genus of the small aquatic family Hydatellaceae, show that P-type plastids are absent from this genus and only starch-accumulating (S-type) sieve-element plastids are present. This discovery is consistent with the recent transfer of Hydatellaceae from the highly derived monocot order Poales (grasses and their allies) to the early-divergent angiosperm order Nymphaeales (waterlilies) based on molecular phylogenetic data. Species of Poales consistently possess P2-subtype plastids, in common with other monocots, but only S-type plastids are present in Nymphaeales. The results confirm that Hydatellaceae do not belong in monocots. Optimisation of the two major types of sieve-element plastid onto a recent phylogeny of early-divergent angiosperms confirms that S-type is the primitive form and indicates that P-type sieve-element plastids have evolved more than once in angiosperms.
ISSN:0033-183X
1615-6102
DOI:10.1007/s00709-009-0067-2