Does Hydrotropism Affect Roots?

Plant roots mediate water uptake from the soil and have developed a number of adaptive traits such as hydrotropism to aid water foraging. Hydrotropism modifies root growth to respond to a water potential gradient in soil and grow towards areas with a higher moisture content.

Do roots show positive hydrotropism?

An example of positive hydrotropism is the growth of plant roots towards higher relative humidity level. The plant is able to sense this at the root cap and then sending signals to the elongating part of the root. Nevertheless, gravitropism often has more influence on root growth than hydrotropism.

Why does a root show positive hydrotropism?

A tropism is generally termed “positive” if growth is toward the signal and “negative” if it is away from the signal. For example, stems usually exhibit positive phototropism, because they grow toward light. One of the lesser-known tropisms is hydrotropism, directed growth in response to water or moisture gradients.