Question

Which pgr promotes rapid internode elongation in deep water rice plants?

Answer 1

The pgr is Gibberellic acid.

It causes elongation of internodes.

Other functions include :

1.) It promotes bolting in rosette plants.

2.) In case of seed dormancy, it breaks seed dormancy and initiates the synthesis of hydrolase enzymes for digesting reserve food thus inducing seed germination.

It also have other uses in horticulture such as:

Delaying senescence.

Answer 2

Ans.

PGRs or plant growth regulators are plant hormones, which play an important in growth and development. The plant hormone that promotes rapid elongation of  deep water rice plants is gibberellic acid or gibberellin. It stimulates rapid growth and elongation of plants by increasing rate of mitotic cell division at internodes.

Thus, the correct answer is 'gibberellic acid.'