Plant Adaptations in Resource-Deficient Environments
Roots, stems, and leaves are structured to ensure that a plant can obtain the required sunlight, water, soil nutrients, and oxygen resources. Some remarkable adaptations have evolved to enable plant species to thrive in less than ideal habitats, where one or more of these resources is in short supply.
In tropical rainforests, light is often scarce, since many trees and plants grow close together and block much of the sunlight from reaching the forest floor. Many tropical plant species have exceptionally broad leaves to maximize the capture of sunlight. Other species are epiphytes: plants that grow on other plants that serve as a physical support. Such plants are able to grow high up in the canopy atop the branches of other trees, where sunlight is more plentiful. Epiphytes live on rain and minerals collected in the branches and leaves of the supporting plant. Bromeliads—members of the pineapple family—ferns, and orchids are examples of tropical epiphytes (Figure 23.28). Many epiphytes have specialized tissues that enable them to efficiently capture and store water.
Some plants have special adaptations that help them to survive in nutrient-poor environments. Carnivorous plants, such as the Venus flytrap and the pitcher plant (Figure 23.29), grow in bogs where the soil is low in nitrogen. In these plants, leaves are modified to capture insects. The insect-capturing leaves may have evolved to provide these plants with a supplementary source of much-needed nitrogen.
Many swamp plants have adaptations that enable them to thrive in wet areas, where their roots grow submerged underwater. In these aquatic areas, the soil is unstable and little oxygen is available to reach the roots. Trees, such as mangroves (Rhizophora spp.) growing in coastal waters produce aboveground roots that help support the tree (Figure 23.30). Some species of mangroves, as well as cypress trees, have pneumatophores: upward-growing roots containing pores and pockets of tissue specialized for gas exchange. Wild rice is an aquatic plant with large air spaces in the root cortex. The air-filled tissue—called aerenchyma—provides a path for oxygen to diffuse down to the root tips, which are embedded in oxygen-poor bottom sediments.
How do pale pitcher plants (Sarracinia alata) make sure that insects do not escape after consuming the nectar that attracted them?
- The insects are skewered on spikes and thorns that rim the funnel-shaped leaf.
- The insects ingest narcotics secreted by the leaf and fall into the funnel-shaped leaf.
- The insects are poisoned by lethal compounds in the nectar.
- The insects are immobilized by sticky substances on the rim of the funnel-shaped leaf.