Division rhodophyta ppt

Topics: Plant, Algae, Photosynthesis Pages: 11 (391 words) Published: January 3, 2015
DIVISION RHODOPHYTA
(RED ALGAE)

RHODOPYTA (RED ALGAE)
Red algae have been the 1st eukaryotes
formed by endosymbiosis involving
photosynthetic prokaryotes.
Red algae are mostly multicellular
It exhibit some of the most complex life
cycles
It posses cellulose walls, chlorophyll a, some
posses chlorophyll d (chloroplast is present
but lacks grana)
Contains phycoerythrin, phycocyanin and
allophycocyanin as accessory pigments.
flagella is absent in red algae as well as
centrioles

5,000 species(approximate number
of known species) are exclusively
marine, abundant in fresh and warm
water.
Different species may be:
a. Free living
b. Epiphytic; or
c. Parasitic
 

STRUCTURE OF RED ALGAE







Chiefly feathery
Branched-filamentous, sometimes
ribbon-like with gelatinous suface
Smaller than most brown algae
Rarely more than 3 or 4 ft. long
Red in color, due to phycoerythrin
-a red pigment
present with chlorophyll

The cell walls of Red algae:
>have cellulose as a framework but are mostly
containing mucilages contains agars and
carrageenans, both of which are polysaccharide.
Sold
as food many
thickeners.
>Corallinered algae that form
layers of calcium carbonate in their cell
walls.
>Phycobilins and caratenoids gives many
red algae.
Eg. Rhodymenia pseudopalmata- red or
pink in color
>Halosaccion- species that do not contain
as much as those accessory pigments,
often blue-green or olive.

a. coralline

c. Halosaccion

b. Rhodymenia
pseudopalmata

REPRODUCTION
Asexual reproduction- by non-motile spores
Sexual reproduction- by non-motile
heterogametes
Male gametes- are spherical, non-motile,
produced in antheridia.
-Carried by water to
female sex organ
Carpognia- female sex organ of red algae,
that, when fertilized, gives rise to
carpospores.
Trichogyne- the elongated tip of
carpognium, to which a sperm may adhere.
 

LIFE CYCLE OF RED ALGAE
Consists of two alternating phases:
1.Haploid, gamete-bearing plants
2.Diploid, tetrasporic plants
oTetrasporophyte- one of the sporophyte
phases
>Tetraspores- spores produced
by tetrasporophyte
> by meiosis

Habitats and distribution
>Chiefly warmer at waters of oceans. Few fresh waters. Often at great depths.
  ECOLOGICAL AND ECONOMICAL

IMPORTANCE OF RED ALGAE:
It is a primary producer, provider at
structural habitat for the marine organisms
Plays an important role in the primary
establishment and maintenance of coral reef
Food for sea animals and man
Used in shoe polish, cosmetics, glue,
confections, jellies

Evolutionary importance of red algae
The importance of red algae lies in their
highly specialized reproductive methods and in
definite alternation of generations which occur
many of them.

REPORTERS:




GENOTA, ALECKS
JACOB, FRANSCINE SU-YEN C.
PD-R2B


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