Lec9, Brown Flashcards
- usually found in marine habitats, less than 1% of the species are from fresh water
- only multicellular species
Brown algae
Major pigments of brown algae
- chlorophylls a, c1, and c2,
• 2. β-carotene,
• 3. violaxanthin,
• 4. diatoxanthin, and
• 5. large amounts of fucoxanthin
largest seaweed known
Macrocystis pyrifera.
Most of ……….. are lithophytes
brown algae
is generally stored in endoplasmic reticulum outside the chloroplast.
Laminarin
is stalked and protrudes from the chloroplast.
Pyrenoid
Asexual reproduction is absent in ……….. brown algae .
Laminaria
produces meiospores (n) by meiosis which germinates and forms haploid gametophy
sporophyte (2n)
can be commonly found as freefloating filaments. It can easily grow as epiphytes.
Ectocarpus
distributed in tropical and subtropical waters ranging from midlittoral to sub-littoral zone
Sargassum
- Thallus is woody, tall with terete main axis.
- The stipe may be short or long , cylindrical or branched.
Sargassum
Commonly known as Kelps
LAMINARIA
What makes Ectocarpus an excellent model system to study
molecular mechanisms related to stress factors.
The widespread distribution of it in different environmental conditions
sporophytes are parenchymatous in nature
Laminaria
leathery texture
Blade
are also popular as sea vegetables
seaweeds
brown seaweeds are consumed as food.
Fucus, Lamianria (kombu) and Undaria (wakame)
salts of algenic acid composed of L-guluronic acid monomers and D-guluronic acid polymers are known as
alginates
was being used for the fistula surgery
Laminaria stipes
is being Used for headache cure
Nereocystis
are being used for the treatment of blood cleansing and easing blood pressure.
Sargassum and Laminaria
Ethanolic extracts of ……. has reported antioxidant activity.
Fucus
