The plant hormone auxin is well known to stimulate cell elongation via increasing wall extensibility. Auxin participates in the regulation of cell wall properties by inducing wall loosening.
Q. How does the zone of elongation contribute to the lengthening of roots?
The zone of elongation is where the newly formed cells increase in length, thereby lengthening the root. Root hairs, which are extensions of root epidermal cells, increase the surface area of the root, greatly contributing to the absorption of water and minerals.
Table of Contents
- Q. How does the zone of elongation contribute to the lengthening of roots?
- Q. How do plants exhibit elongation?
- Q. What is elongation region?
- Q. What is elongation in a plant?
- Q. How does IAA cause cell elongation?
- Q. What cells do Auxins target?
- Q. Does auxin cause apoptosis?
- Q. How does auxin affect Gravitropism?
- Q. What happens during delay of senescence?
Q. How do plants exhibit elongation?
Plants are able to grow rapidly through elongation because of the structure of the plant cell. Plant cells have a large central vacuole. This central vacuole can fill with water and expand the cell to great lengths.
Q. What is elongation region?
The region at the tip of the plant root where growth occurs is divided into functional zones. The meristem contains cells that divide continuously, generating the cells that make up the root. The elongation zone contains cells that do not divide and instead elongate rapidly, about 10 times faster than meristem cells.
Q. What is elongation in a plant?
Cell elongation is a developmental process that is regulated by light and phytohormones and is of critical importance for plant growth. Mutants defective in their response to light and various hormones are often dwarfs. Therefore, an intact brassinosteroid system is an absolute requirement for cell elongation.
Q. How does IAA cause cell elongation?
Abstract. Plant cells elongate irreversibly only when load-bearing bonds in the walls are cleaved. Auxin causes the elongation of stem and coleoptile cells by promoting wall loosening via cleavage of these bonds. This process may be coupled with the intercalation of new cell wall polymers.
Q. What cells do Auxins target?
Auxins promote stem elongation, inhibit growth of lateral buds (maintains apical dominance). They are produced in the stem, buds, and root tips. Example: Indole Acetic Acid (IA). Auxin is a plant hormone produced in the stem tip that promotes cell elongation.
Q. Does auxin cause apoptosis?
Combination of cytokinin and auxin induces apoptosis, cell cycle progression arrest and blockage of the Akt pathway in HeLa cells.
Q. How does auxin affect Gravitropism?
Growth due to gravitropism is mediated by changes in concentration of the plant hormone auxin within plant cells. In stems, the auxin also accumulates on the lower side, however in this tissue it increases cell expansion and results in the shoot curving up (negative gravitropism).
Q. What happens during delay of senescence?
Leaf senescence is an active process involving remobilization of nutrients from senescing leaves to other parts of the plant. The delay in senescence was revealed by an increase in chlorophyll content in SAG:kn1 leaves relative to leaves of the control plants and by a decrease in the number of dead leaves.
