Reproduction

Japanese Bloodgrass

Japanese blood grass (Imperata cylindricais banned in half of the states in the United States due to its invasive nature. If Japanese blood grass is allowed to revert back it it’s green state (before it turns the iconic blood red state) then it takes its more aggressive form and spreads via its rhizomes through a series of stem-like networks underground, allowing it to take over areas vast areas of land.

Figure 1 Reproduction – Imperata cylindria ‘Red Baron’, a strain of Japanese Blood Grass

Rhizomes are a horizontal underground root system that store starches and proteins. As such it enables them to survive a throughout unfavourable weathers and seasons as they reproduce underground. (Encyclopedia Britannica. 2019)

The modified stems reproduce asexually, also known as vegetative reproduction. This occurs when the horizontal stems develop new vertical stems at critical points.

Rhizomes grow outwards, invading into nearby soils and allows them to develop a new network of vertical stems and horizontal stems.

This type of reproduction creates an invasive plant such as Japanese Blood Grass to become such a nuisance plant.

Figure 2 Reproduction – Picture of a rhizome network.

Brewer’s Yeast

Brewer’s Yeast (Saccharomyces cerevisiae) is a unicellular fungus that reproduces asexually through a budding process in which cells are replicated using mitosis (cell division). (Micropop.cbs.umn.edu. 2019)
Budding occurs in most yeasts, in this process small growths form at the end of the the mother cell. The mother cell shares its cytoplasm with the growth and uses mitosis to split its nucleus, allowing both the growth and mother cell to have its own nucleus. The mother cell is able to reproduce many growths at one time, sharing it’s cytoplasm and dividing its nucleus over and over again. Once the growth develops to a certain point before it detaches it is also capable of budding by using the same process and this can cause a chain of cells to be produced. Eventually the buds will detach themselves from the mother cell and these become individual yeast cells.

Figure Reproduction – Diagram of the budding process in yeast. (Funscience.in. 2019)

By Natalie Thomas