First slide

Seed dormancy

Question

Which of the following is not an inhibitory substance governing seed dormancy ?

Easy

A

Abscisic acid
B

Phenolic acid
C

Para-ascorbic acid
D

Gibberellic acid

Solution

Gibberellic acid breaks seed dormancy and promotes seed germination. After water is imbibed, the release of gibberellins from the embryo signals the seed to break dormancy and germinate. Gibberellins support the growth of cereal seedlings by stimulating the synthesis of digestive enzymes such as α-amylase that mobilize stored nutrients.
Presence of chemical inhibitors such as abscisic acids, phenolic acids, para-ascorbic acid are sometimes the reasons which cause seed dormancy. The role of inhibitors in seed dormancy is not clear.

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