CATDOLL : CATDOLL: The life history of kelp

The life cycle of kelp has obvious alternation of generations. When the sporophyte matures, single

The zoosporangium is a cluster of rods with long cells in the middle, called septa.

(paraphysis, or lateral filaments), the tip of the septum has a transparent gelatinous crown. Zoospores grow on the strips

The ascus area is dark brown. The spore mother cell undergoes meiosis and multiple ordinary divisions to produce many

Homozygous zoospores with haploid lateral double flagella. Zoospores are pear-shaped, with two lateral flagella of unequal length.

The spores of Laminaria japonica mature in September and October, and a large number of spores are released from the end of October to November.

The zoospores of the

The spermatophore is a branched filament composed of a dozen to dozens of cells, and the sperm vesicle on it is composed of one cell.

The female gametophyte is composed of a few

It is composed of relatively large cells with few branches. When there are 2-4 cells, a single-celled oocyst is produced at the end of the branch.

There is an egg inside. When mature, the egg is released and attached to the top of the egg capsule. The egg is fertilized outside the mother's body to form a double

The zygote does not leave the mother body and germinates into new kelp after a few days. In June of the following year, under suitable conditions,

The sporophyte and gametophyte of kelp are very different. The sporophyte is flat and large.

Organized differentiation, the gametophyte consists of only a dozen cells. This life cycle is called heterozygous interbreeding.

(Figure 1-62).

The growth period of kelp in natural conditions is 2 years, while that in artificial raft conditions is 1 year.

The seedlings are collected in the autumn of the first year, and the growth rate reaches its peak in March-April of the second year, with the algae reaching 2-3 meters in length.

In autumn, when the water temperature drops below 21°C, the band produces a large number of sporangia.

A large number of spores are released during the month, and if they are not harvested, the algae will die. The algae can only live for 13-14 months.

about.

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The life cycle of kelp has obvious alternation of generations. When the sporophyte matures, single

Zoosporangium in the chamber, which is clustered in a club-like shape with long cells in the middle, called septa

(paraphysis, or lateral filaments), the tip of the septum has a transparent gelatinous crown. Zoospores grow on the strips

The ascus area is dark brown. The spore mother cell undergoes meiosis and multiple meiotic divisions to produce many

Homozygous zoospores with haploid lateral double flagella. Zoospores are pear-shaped, with two lateral flagella of unequal length.

The spores of Laminaria japonica mature in September and October, and a large number of spores are released from the end of October to November.

The zoospores of the spores are physiologically different. After the zoospores fall to the ground, they immediately germinate into female and male gametophytes.

The spermatophore is a branched filament composed of a dozen to dozens of cells, and the sperm vesicle on it is composed of one cell.

The female gametophyte is composed of a few

It is composed of relatively large cells with few branches. When there are 2-4 cells, a single-celled oocyst is produced at the end of the branch.

There is an egg inside. When mature, the egg is released and attached to the top of the egg capsule. The egg is fertilized outside the mother's body to form a double

The zygote does not leave the mother body and germinates into new kelp after a few days. In June of the following year, under suitable conditions,

The sporophyte and gametophyte of kelp are very different. The sporophyte is large and

Organized differentiation, the gametophyte consists of only a dozen cells. This life cycle is called heterozygous interbreeding.

(Figure 1-62).

The growth period of kelp in natural conditions is 2 years, and that of kelp cultivated under artificial raft conditions is 1 year.

The seedlings are collected in the autumn of the first year, and the growth rate reaches its peak in March-April of the second year, with the algae reaching 2-3 meters in length.

When the water temperature drops below 21℃ in autumn, the band produces a large number of sporangia.

A large number of spores are released during the month, and if they are not harvested, the algae will die. The algae can only live for 13-14 months.

about.

kelp

Kelp is an algae of the Laminariaceae family (wild kelp).

Plant morphology: The algae is brown, long and ribbon-shaped, leathery, generally 2-6 cm long and 20-30 cm wide. The algae is clearly divided into the holdfast, the stalk and the blade. The holdfast is rhizoid-shaped, the stalk is thick and short cylindrical, and the upper part of the stalk is a wide and long ribbon-shaped blade. There are two parallel shallow grooves in the center of the blade, the middle is the middle belt, 2-5 mm thick, and the two edges of the middle belt are thin and have wavy wrinkles. It is cultivated along the coast of my country, and it can be found on rocks 2-3 meters below the low tide line in the wild sea. The sodium alginate in kelp has the effect of preventing leukemia and osteomalacia; it also has a hemostatic effect on arterial bleeding, and oral administration can reduce the absorption of radioactive element strontium-90 in the intestine. Sodium alginate has a hypotensive effect. Kelp starch has the effect of lowering and improving low-fat blood lipids. In recent years, it has also been found that an extract of kelp has anti-cancer effects. Kelp mannitol is effective in treating acute renal failure, cerebral edema, Japanese encephalitis, and acute glaucoma. People with spleen and stomach deficiency should eat less