Plant growth regulators are transported by xylem or phloem?

Question

Answer

From both

Answer

Plant Growth Regulators Transported by Xylem or Phloem?

Plant growth regulators (PGRs) are naturally occurring or synthetic substances that regulate plant growth and development. They include hormones, such as auxins, cytokinins, gibberellins, abscisic acid, and ethylene, as well as other compounds, such as jasmonates, salicylates, and brassinosteroids. The transport of PGRs within a plant is essential for their proper functioning, and it occurs through either xylem or phloem.

Xylem Transport of PGRs

Xylem is a specialized tissue that carries water and dissolved minerals from the roots to the leaves of a plant. However, some PGRs, such as abscisic acid, can also be transported through the xylem. This is because these PGRs are soluble in water and can passively move along with the water flow. In the case of abscisic acid, it is synthesized in the leaves and then transported through the phloem to the roots, where it induces stomatal closure and reduces water loss.

Phloem Transport of PGRs

Phloem is another specialized tissue that transports organic compounds, such as sugars, amino acids, and PGRs, from the leaves to other parts of the plant. PGRs that are transported through the phloem include auxins, cytokinins, gibberellins, and some signaling peptides. These PGRs are not soluble in water and require active transport mechanisms to move through the phloem. For example, auxins are synthesized in the apical meristem and then transported down the stem to the roots through the phloem. This transport is facilitated by auxin efflux carriers, which actively pump auxins out of the cells and into the phloem sieve tubes.

Conclusion

In conclusion, PGRs can be transported through either xylem or phloem, depending on their chemical properties and the transport mechanisms available. Water-soluble PGRs, such as abscisic acid, can move through the xylem passively, while organic PGRs, such as auxins and cytokinins, require active transport through the phloem. Understanding the transport of PGRs within a plant is important for developing strategies to manipulate plant growth and development for agricultural and horticultural purposes.

Answer

Xylem and phloem transport water, raw materials and prepared food of the plants by the leaves.
Since all of these are necessary for the growth of plants,therefore, both of them are responsible for transporting the growth regulator of plants

Answer

By both becoz xylem provides water and minerals to plants and phloem provides food for their growth and development.....

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