What are the latest propagation methods for agarweed (Gelidium)?

Agarweed (Gelidium) is a cosmopolitan red alga, generally growing on rocks on the seabed, but because market demand for agarweed keeps increasing, artificial cultivation is needed, so for this kind of algal plant, how do we propagate it? What propagation methods are there? Below we will learn about the propagation methods of agarweed together.

1. Spore propagation

Spore propagation is a propagation method that uses the male and female gametophytes of agarweed spores. We need to prepare the male gametes of agarweed as well as female gametes that are nearly mature or mature, and rely on the flow of seawater to achieve fertilization. After fertilization, a zygote forms; the zygote cannot leave the parent body, and after the cells fuse they form a fusion cell, which produces spore filaments and finally forms a tetrasporophyte. After the tetrasporophyte matures, the sporangium wall ruptures, the spores scatter onto the substrate on the seabed, and finally agarweed grows. This is the process of agarweed spore propagation; during propagation it needs to undergo multiple divisions and fusions before it can formally grow and develop.

2. Vegetative thallus propagation

Vegetative thallus propagation is a new propagation method formed through continuous research in later periods. Vegetative thallus propagation is mainly divided into three types: stolon propagation, rhizoid propagation, and vegetative branch propagation. Let us understand them specifically below.

1. Stolon propagation

Stolon propagation is when agarweed seedlings grow to a certain size, at which point agarweed grows stolons, and these stolons continue to grow. Finally we can see that something similar to roots appears on the stolons; these root-like substances grow upward into separate agarweed plants and keep increasing, making the number of individual agarweed plants greater and greater. This propagation method is also often used in later planting processes.

2. Rhizoid propagation

Rhizoid propagation is a method that uses the false branch tips of agarweed for propagation. These false branch tips are like the young buds of agarweed spore propagation; then we cultivate the cut-off false branch tips, and finally they can also grow stolons and erect branches, ultimately growing into separate individuals. With this propagation method, in later periods we can generally take seed when harvesting agarweed: keep the false branch tips of the agarweed on the harvesting net, then put them back into seawater, and they can continue to grow and propagate.

3. Vegetative branch propagation

Vegetative branch propagation is currently the most commonly used propagation method for agarweed. This propagation method mainly uses agarweed branches or the cut-off base of the main branch for propagation. But we must note that the base of the cut-off main stem must be at the junction with the rock, so that new buds can grow and form new individual agarweed plants. Of course, if net-cage cultivation is used, then after the branches on the net cage are cut off, the base remaining on the net cage can continue to grow.

The above are the two main propagation methods most commonly used for agarweed. The editor has only briefly introduced them here, hoping to help everyone. If you want to learn about agarweed cultivation techniques, remember to contact the editor.