A barley mutant lacking a gibberellic acid receptor would
a. Fail to make GA.
b. Catalyze starch more quickly.
c. Fail to make α-amylase.
d. Fail to take up water.

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Understand the role of gibberellic acid (GA) in plants: GA is a plant hormone that plays a crucial role in various growth processes, including seed germination, stem elongation, and enzyme production.

Recognize the function of a gibberellic acid receptor: This receptor is necessary for the plant to respond to GA. When GA binds to its receptor, it triggers a signaling pathway that leads to specific physiological responses.

Identify the process of seed germination: During germination, GA stimulates the production of enzymes like alpha-amylase, which breaks down starches into sugars to provide energy for the growing seedling.

Consider the consequences of lacking a GA receptor: Without the receptor, the plant cannot respond to GA, which means it cannot initiate the signaling pathway necessary for producing enzymes like alpha-amylase.

Evaluate the options: Since the mutant lacks the receptor, it would specifically fail to produce alpha-amylase, as this process is directly dependent on GA signaling. Therefore, the correct answer is related to the failure in enzyme production.

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Gibberellic Acid (GA)

Gibberellic acid is a plant hormone that plays a crucial role in various growth processes, including seed germination, stem elongation, and enzyme production. It is essential for the synthesis of enzymes like α-amylase, which helps in breaking down starch into sugars during seed germination. Understanding GA's function is key to analyzing the effects of its receptor absence.

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Gibberellic Acid Receptor

The gibberellic acid receptor is a protein that binds to GA, initiating a signal transduction pathway that leads to physiological responses such as enzyme production and growth regulation. Without this receptor, the plant cannot respond to GA, affecting processes like α-amylase synthesis, which is vital for starch breakdown during germination.

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Intracellular Receptors

α-Amylase

α-Amylase is an enzyme that catalyzes the hydrolysis of starch into sugars, providing energy for the growing plant. Its production is stimulated by gibberellic acid during seed germination. A lack of GA receptor would impede α-amylase synthesis, affecting the plant's ability to utilize stored starch, which is crucial for early growth stages.

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