The correct answer is option 1: Mangrove areas.

Mangrove areas are known for their unique plant communities and one of the distinguishing features of these plants is the presence of breathing roots, also known as pneumatophores. These specialized roots grow above the ground or water surface and help in gas exchange for the plants.

Option 2, deserts, does not have an abundance of plants with breathing roots. In deserts, plants have adapted to conserve water and generally have deep root systems to access water underground.

Option 3, tropical savannahs, also do not have an abundance of plants with breathing roots. Plants in tropical savannahs are adapted to withstand long dry seasons and often have extensive root systems to access water deep in the soil.

Option 4, tundra regions, do not have plants with breathing roots. In tundra regions, plants have shallow root systems that are adapted to survive in the frozen ground.

Therefore, the correct answer is option 1, as mangrove areas are known for their abundance of plants with breathing roots.