Question

difference between primary and secondary mycelium of basidiomycetes​

Answer 1

Explanation:

In the primary stage, a haploid spore germinates and grows a germ tube, which develops into mycelium. ... A secondary mycelium forms upon conjugation of two sexually compatible hyphae. The secondary mycelium is dikaryotic, in that it has two haploid nuclei, one from each parent.

The sexual reproduction phase of the club fungi involves three developmental stages of the mycelium. In the primary stage, a haploid spore germinates and grows a germ tube, which develops into mycelium. The mycelium initially contains a single haploid nucleus. Then, its haploid nucleus divides and septa form between the nuclei.

A secondary mycelium forms upon conjugation of two sexually compatible hyphae. The secondary mycelium is dikaryotic, in that it has two haploid nuclei, one from each parent. As the dikaryotic mycelium grows, the cells divide and more septa are formed between the new cells.

Each of the new cells in the secondary mycelium has one haploid nucleus from each parent. This is assured by clamp connections, specialized structures unique to the club fungi. These are loop-like hyphae which connect the cytoplasm of adjacent cells and through which nuclei move during cell division. In particular, during cell division, one nucleus divides directly into the newly formed cell; the other nucleus divides inside the clamp connection and the two daughter nuclei migrate through the clamp connection in opposite directions to the two daughter cells.

The tertiary mycelium is simply an organized mass of secondary mycelium. It is a morphologically complex tissue and forms structures such as the typically mushroom-shaped basidiocarps commonly seen in nature.

Sexual reproduction of the club fungi begins upon fusion of two primary hyphae to form a club-shaped structure, known as a basidium. Second, the two haploid nuclei inside the basidium fuse together to form a diploid zygote. Third, the zygote undergoes meiosis to form two haploid nuclei. Fourth, these two haploid nuclei undergo mitosis to form a total of four haploid nuclei. These four nuclei then migrate into projections, which form on the tip of the basidium. These projections then develop into four separate haploid spores, each with a single nucleus.

Answer 2

The difference between primary and secondary mycelium of basidiomycetes are as follows:

• The fundamental distinction between primary and secondary mycelium of basidiomycetes is that primary mycelium formulates from fungal spores when they grow and construct germ canals while secondary mycelium shapes from sexually consistent hyphae when they conjugate during all reproduction processes.
• Basidiomycetes are a primary organization of fungi.
• The mycelium of basidiomycete fungi endures various development modifications such as primary, secondary and tertiary phases. Primary mycelium occurs during the primary phase while secondary mycelium emerges during the second phase of their life processes.
• Primary mycelium formulates from basidiospores. Spores ripe and construct a germ tube and formulate into the primary mycelium.
• During sexual reproduction, sexually similar two types of hyphae conjugate with each other and construct the secondary mycelium.

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