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A stem is one of two main structural axes of a vascular plant, the other being the root. It supports leaves, flowers and fruits, transports water and dissolved substances between the roots and the shoots in the xylem and phloem, engages in photosynthesis, stores nutrients, and produces new living tissue. [1]
The vegetative (somatic) structures of vascular plants include two major organ systems: (1) a shoot system, composed of stems and leaves, and (2) a root system. These two systems are common to nearly all vascular plants, and provide a unifying theme for the study of plant morphology.
Adventitious roots arise out-of-sequence from the more usual root formation of branches of a primary root, and instead originate from the stem, branches, leaves, or old woody roots. They commonly occur in monocots and pteridophytes, but also in many dicots , such as clover ( Trifolium ), ivy ( Hedera ), strawberry ( Fragaria ) and willow ( Salix ).
Roots is a 1977 American television miniseries based on Alex Haley's 1976 novel Roots: The Saga of an American Family, set during and after the era of enslavement in the United States. The series first aired on ABC in January 1977 over eight consecutive nights.
The bacterium, Bradyrhizobium japonicum, colonizes the roots and establishes a nitrogen fixing symbiosis. This high magnification image shows part of a cell with single bacteroids within their symbiosomes. In this image, endoplasmic reticulum, dictysome and cell wall can be seen. Nitrogen-fixing nodules on a clover root.
Both root tips and most stem tips exhibit positive phototropism to red light. [ citation needed ] Cryptochromes are photoreceptors that absorb blue/ UV-A light, and they help control the circadian rhythm in plants and timing of flowering.
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These aerial roots can become very numerous. The Great Banyan of Kolkata, which has been tracked carefully for many years, currently has 2,880 supplementary trunks. [11] Such prop roots can be sixty feet (eighteen meters) in height. [12] [13] Old trees can spread laterally by using these prop roots to grow over a wide area. In some species, the ...