What affects the mitotic index?

The number of cells in mitosis were counted for cells from different regions of the primary root tissue. Interpretation: In general, the mitotic index decreases with increasing distance from the root cap junction.

What factors affect mitotic index?

Other factors that may affect the mitotic rate are salinity, temperature, mineral limiting factors, pH, roundworms, soil bac teria or fungus, other plant hormones, amount of light, acetaminophen, aspirin, ibuprofen, vitamins and minerals, heavy metals, antibiotics, and certain plant competitors that excrete inhibiting …

Does temperature affect mitotic index?

The rate of cell progress, or mitotic rate, throughout the mitotic cycle increases linearly with increase in temperature between the range 3 °C to 25 °C.

What factors affect the rate of cell division?

Factors Affecting Cell Division

  • Nutrients. The nutrients present in the cell affect cell division. …
  • Genetics. Genetic code regulates cell division. …
  • Chemicals. Exposure to toxic chemicals such as pesticides and some cleaning chemicals can cause cell mutation. …
  • Stress. Stress affects cell division.
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Why is the mitotic index affected by pH?

If the pH of the surrounding is close to pH 5.5 to pH 6.5, the plant will have the highest mitosis(growth) rate, resulting in aheavier weight and a longer root. However, in pH 10 groups, the mitosis(growth) rate will be slower, resulting in a lighter weight and a shorter root.

Does caffeine affect mitosis?

Overall, most research data indicate that caffeine does indeed reverse DNA-damage-induced G2 arrest and drive cells through a fatal mitosis.

What is mitotic index What is its significance?

The mitotic index (percentage of cells in mitosis at any time) provides a measure of the capacity of cells to divide and of the rate of cell division. It is used to identify the sites of growth within a tissue and to determine which cell types are dividing.

How does pH affect mitosis?

Experiments have shown that the intracellular pH of many cells rises to a maximum at the onset of mitosis, subsequently decreasing 0.3 to 0.5 pH units by the end of mitosis. This result, and observations that tubulin net charge depends strongly on pH, may be critical for microtubule (MT) dynamics during mitosis.

Does water affect mitosis?

Effect of Water Stress on Mitotic Activity

Water stress quickly reduced the mitotic activity of mesophyll cells in the meristematic zone and reduced the zone of cell division.

What affects plant mitosis?

With environmental factors, such as rainfall or lectin protein, mitosis is induced in some root apical meristem tissues. Lectin is a protein found in soil near roots, which stimulates the rapid division of cells. The health of a plant or animal depends upon both biotic and abiotic factors.

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What factors influence cell growth?

For a typical dividing mammalian cell, growth occurs in the G1 phase of the cell cycle and is tightly coordinated with S phase (DNA synthesis) and M phase (mitosis). The combined influence of growth factors, hormones, and nutrient availability provides the external cues for cells to grow.

What factors affect cell growth?

Factors studied included temperature, level of dissolved oxygen, nutrient depletion, and waste product accumulation. Growing cells at temperatures 3-9 degrees lower than optimum (37 degrees C) increased viability but monoclonal antibody production was lowered.

What does mitotic index indicate about root growth?

One way to quantify cell division is by using the mitotic index: For example, the mitotic index can be used to examine cell proliferation in primary root tissue. The number of cells in mitosis were counted for cells from different regions of the primary root tissue.

What is indicated by the mitotic index of tissue taken from a Tumour?

An elevated mitotic index indicates more cells are dividing. In cancer cells, the mitotic index may be elevated compared to normal growth of tissues or cellular repair of the site of an injury.

What are the phases of mitosis?

Today, mitosis is understood to involve five phases, based on the physical state of the chromosomes and spindle. These phases are prophase, prometaphase, metaphase, anaphase, and telophase.