Difference Between Abscission and Senescence

The main difference between abscission and senescence is that abscission is the separation of a senescent plant part or organ from the plant body whereas senescence is the age-related deterioration of plant organs.

1. What is the definition of abscission?
2. What causes abscission?
3. What happens during leaf senescence?
4. What hormones are involved in abscission of leaves senescence?
5. What does the seed do in a flower?
6. What is the most important plant hormone?
7. Does auxin prevent abscission?
8. What harm does abscission cause to plant?
9. Does auxin promote senescence?
10. What is fruit senescence?
11. Which plant hormone is responsible for the ripening of fruit?

What is the definition of abscission?

1 : the act or process of cutting off : removal. 2 : the natural separation of flowers, fruit, or leaves from plants at a special separation layer.

What causes abscission?

The reduction of chlorophyll production in leaves due to decreased sunlight in the autumn explains why some leaves turn yellow. However, the yellow color can attract aphids, so some trees turn the leaves red instead by injecting a bright pigment. The loss of chlorophyll may also contribute to the abscission process.

What happens during leaf senescence?

During senescence, leaf cells are subject to massive physiological and biochemical changes, including a dramatic metabolic transition from anabolism to catabolism which results in nutrient redistribution to newly developing organs (Lim et al., 2007).

What hormones are involved in abscission of leaves senescence?

As most developmental processes in plants, the regulation of abscission involves the plant hormone auxin. Auxin functions as a brake — if high auxin concentrations reach the AZ cells, abscission is not activated.

What does the seed do in a flower?

Flowering plants grow from seeds

When a seed comes to rest in an appropriate place with conditions suitable to its germination, it breaks open. The embryo inside the seed starts to grow into a seedling. Roots grow down to anchor the plant in the ground. Roots also take up water and nutrients and store food.

What is the most important plant hormone?

Gibberellins, being one of the most important and primary plant hormones, have physiological functions such as stimulating organ growth through enhancement of cell elongation and cell division; they also act as a developmental switch between seed dormancy and germination, juvenile and adult growth phases, and ...

Does auxin prevent abscission?

Auxin appeared to be responsible for delaying or preventing the abscission of F. petiole into the stem and, when the leaf ages or is exposed to removal of the lamina or physiological damage, the auxin status declines reSUlting in abscission [1, 3].

What harm does abscission cause to plant?

Fruit production requires the perfect development of reproductive structures. Abscission, a natural process, can occur to facilitate shedding of no longer needed, infected, or damaged organs. If stress occurs during flower development, abscission can intervene at flower level, leading to reduced yield.

Does auxin promote senescence?

Auxins function in multiple aspects of plant development and growth, including apical dominance, vascular differentiation, and shoot elongation. ... On the other hand, auxin can stimulate the biosynthesis of senescence-promoting hormones such as ethylene and ABA (Hansen and Grossmann, 2000; Vandenbussche et al., 2003).

What is fruit senescence?

Senescence is the natural progression of the fruit from maturity to death or decay wheres cell aging may refer to periodic advancement (may be natural or induced) of the fruit cells toward death or decay.

Which plant hormone is responsible for the ripening of fruit?

Owing to its predominant role in ripening of the climacteric fruits, ethylene remains the most explored hormone (Bapat et al., 2010). Two systems of ethylene biosynthesis operate during fruit development and ripening in climacteric fruits.