Parasitic plants
/ˌpærəˈsɪtɪk plænts/
Definition
Parasitic plants are plants that obtain some or all of their water and nutrients from another living plant, called a host, through specialized organs known as haustoria. This biological group differs from epiphytes and vines because it taps directly into host tissues. Some still photosynthesize, while others depend almost entirely on the host. Common examples include mistletoe, dodder, and broomrape.
Effects on Plants
- Host damage patterns: Parasitic plants can reduce a host’s water, mineral, and sugar supply, which may lead to stunting, yellowing, poor flowering, branch dieback, or lower seed production.
- Attachment through haustoria: They connect to host tissues with haustoria, specialized organs that tap into xylem and sometimes phloem, the plant vessels that move water and sugars.
- Different levels of dependence: Some groups still photosynthesize and mainly steal water and minerals, while others depend much more heavily on the host because they have little or no chlorophyll.
- Examples gardeners may notice: Dodder can appear as threadlike stems twining over soft growth, while mistletoe forms clumps on branches; both are useful visual clues when checking susceptible plants.
Related Terms
Haustoria
Haustoria are specialized feeding structures produced by parasitic plants and some plant-pathogenic fungi. They…
Heterotroph
Heterotroph refers to an organism that cannot make its own food from sunlight or inorganic chemicals and must obtain…
Symbiosis
Symbiosis refers to a close, long-term biological relationship between two different organisms living together. In…
Root
Root refers to the plant organ, usually below ground, that anchors the plant and absorbs water and dissolved minerals…
Stem
Stem refers to the main aboveground plant structure that supports leaves, buds, flowers, and fruits, and connects them…
Vascular tissue
Vascular tissue is the plant transport system, made of xylem and phloem. Xylem carries water and dissolved minerals…
Xylem
Xylem is the plant vascular tissue that carries water and dissolved minerals from the roots to stems and leaves. It…