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Introduction
to the Ochrophytes
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Ochrophytes:
Group of algal division that appear brown/golden instead of green (ochro
= brown); also referred to as Chromophytes
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Flagella
ultrastructure changed former grouping of
chromophytes to the new ochrophytes; all cells exhibit heterokont flagella
= two different flagella; new systematics confirmed by genetic information,
including relationship of some heterotrophic organisms (protozoa, oomycetes)
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Flagella:
one long, forward flagellum with two rows of stiff, three-parted hairs
(mastigoneme);
one short, smooth flagellum with basal granule (light sensing)
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Flagellar
root: origin of flagella perpendicular,each
bearing two microtubular roots (R1 – R4);R3 is looplike, associated with
phagotrophy
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Loss
of R3 is associated with loss of phagotrophy
in synurophyceans
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Diversification
of flagellar apparatus in various groups of ochrophytes, particularly of
R3 loop
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Sequencing
of SSU rDNA indicate that ochro-phytes are monophyletic
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Diatoms
are phylogenetically more separatedfrom other groups of ochrophytes
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