What is the life cycle of the Ulva?
Like many marine algae, Ulva has a biphasic life cycle consisting of an alternation between two free-living forms, a haploid phase (1N, gametophyte) and a diploid phase (2N, sporophyte; Fig 1).
What is the structure of Ulva?
Each cell contains one nucleus and has a cup-shaped choroplast with a single or several pyrenoid. Ulva has a alternation of generations. Biflagellate isogametes are formed by certain cells of the haploid, gametangial plant.
How does Ulva reproduce?
Reproduction in Ulva: Vegetative reproduction in Ulva takes place by accidental fragmentation of the thallus growing usually in quiet estuarine waters. Asexual reproduction takes place with the help of quadriflagellate zoospores, produced within the vegetative cells of the thallus.
What are the uses of Ulva?
Uses in food As suggested by its common name sea lettuce, Ulva lactuca is commonly used as a sea vegetable in salads. It is also served cooked, in soups, and along with meats and fish. It is a common food source for humans in Great Britain, Ireland, Scandinavia, China, and Japan.
Which structures in the life cycle of the Ulva are haploid?
An alternation of diploid asexual generation (sporophyte) and a haploid sexual one (gametophyte).
Why is the life cycle of Ulva considered as isomorphic?
These phases of Ulva are isomorphic, meaning that the gametophyte and sporophyte are morphologically similar and cannot be visually distinguished in the field. If the phases are ecologically equivalent, we expect a ratio √2 gametophytes to 1 sporophyte at equilibrium (Thornber & Gaines 2004).
What is the characteristics of Ulva?
Description. Ulva lactuca is a thin flat green algae growing from a discoid holdfast. The margin is somewhat ruffled and often torn. It may reach 18 centimetres (7.1 in) or more in length, though generally much less, and up to 30 centimetres (12 in) across.
What is the about length of Ulva?
Commonly, Ulva grows up to 30–50 cm in length but it can be as long as 1 m. Thalli may or may not have a distinct holdfast. Reproductive regions accumulate a specific carotene and appear green to olive-green to brownish green (Hiraoka et al., 1998).
What is the phylum of Ulva?
Green algaeSea lettuce / Phylum
What is Ulva life cycle?
Ulva life cycle Ulva usually multiply bymeans of fragments which are accidentally produced from a thallus. Vegetative multiplication also takes place by means of the proliferation of perennial holdfast. Asexual reproduction : Asexual reproduction takes place by means of quadriflagellate zoospores.
How do Ulva usually multiply?
Ulva usually multiply bymeans of fragments which are accidentally produced from a thallus. Vegetative multiplication also takes place by means of the proliferation of perennial holdfast.
Does Ulva show isomorphic alternation of generations?
Both kinds of plants are morphologically identical and therefore ulva shows an isomorphic alternation of generations.
What is the shape of Ulva?
5. Ulva Structure Ulva lactuca is a thin flat green algae growing from a discoid holdfast. The membrane is two cells thick, soft and translucent, and grows attached, without a stipe, to rocks or other algae by a small disc-shaped holdfast.