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Which hormone promotes internode/petiole elongation in deep water rice?
Kinetin
Ethylene
Answers (1)
The correct option is Option 3) Ethylene.
Ethylene is a plant hormone that plays a crucial role in promoting internode and petiole elongation in deep water rice plants. Deep water rice, also known as floating rice, is a variety of rice that is adapted to grow in flooded or waterlogged conditions.
When deep water rice plants are submerged in water, the lack of oxygen and the presence of ethylene stimulate elongation growth in the internodes and petioles. Ethylene acts as a signal to trigger the elongation of these plant parts, allowing the plant to grow taller and keep its leaves above the water surface for efficient gas exchange.
Gibberellic acid (GA3) is a hormone that is involved in promoting stem elongation in many plant species. However, ethylene is specifically associated with promoting internode and petiole elongation in deep water rice under flooded conditions.
Kinetin is a type of cytokinin hormone that is involved in cell division and growth regulation but is not directly associated with internode or petiole elongation in deep water rice.
2,4-D (2,4-dichlorophenoxyacetic acid) is a synthetic auxin hormone that is commonly used as a herbicide. It is not directly involved in promoting internode or petiole elongation in deep water rice.
Therefore, Option 3) Ethylene is the correct option for the hormone that promotes internode/petiole elongation in deep water rice.
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