Roots
External structure of roots
Organization of root systems
Structure of individual root
Internal structure of roots
Root apical meristem
Zone of elongation
Zone of maturation/root hair zone
Other types of roots and root
Storage roots
Prop roots
Aerial roots of orchids
Contractile roots
Mycorrhizae
Root nodules & nitrogen fixation
Roots of strangler figs
Lateral roots
Radicle
Fibrous root system
adventitious roots
Roots must have an enormous absorptive surface in order for a single unbranched root to have sufficient surface area which makes it nearly impossible for roots to have good construction, but that's why there is a root system
Set of roots in which all roots are more or less the same size, none especially larger than any other root (none is a taproot)
Lateral roots are produced when cells in the pericycle, the layer of cells surrounding the central vascular cylinder, begin to divide, form additional cell layers that push through the outer cell layers of the primary root, and ultimately organize a second root meristem.
a plant embryo that develops into the primary root
roots that form from any nonroot tissue and are produced both during normal development,and in response to stress conditions, such as flooding, nutrient deprivation, and wounding.
An individual root is fairly simple because it has no leaves or leaf scars it has neither leaf axils nor axillary buds.
Root cap
is a type of tissue at the tip of a plant root. It is also called calyptra. Root caps contain statocytes which are involved in gravity perception in plants
zone of elongation is where the newly formed cells increase in length, thereby lengthening the root
Beginning at the first root hair is the zone of cell maturation where the root cells begin to differentiate into special cell types
is a small region at the tip of a root in which all cells are capable of repeated division and from which all primary root tissues are derived
Mucigel
is a slimy substance that covers the root cap of the roots of plants. It is a highly hydrated polysaccharide, most likely a pectin, which is secreted from the outermost (epidermal) cells of the rootcap
Any of the modified roots that arise from the stem of certain plants and provide extra support. Such stems are usually tall and slender and the prop roots develop at successively higher levels as the stem elongates, as in the maize plant
these roots are modified for storage of food or water, such as carrots and beets. They include some taproots and tuberous roots. Structural roots: large roots that have undergone considerable secondary thickening and provide mechanical support to woody plants and trees.
is a thickened specialized root at the base of a corm, bulb, rosette or other organ which is designed to shrink vertically under conditions of seasonal drought that helps position this plant part at an appropriate level in the ground.
Living attached to the branches of trees, these roots spread along the surface of the bark and often dangle freely in the air. These plants live in rainforests the orchids are actually adapted to drought conditions
The roots grow down to the forest floor where they take root and begin to take nutrients from the soil. Gradually the roots wrap around the host tree, widen, and slowly form a lattice-work that surrounds the host's trunk.
Fungi that form a symbiotic relationship with roots usually of benefit to plants because they provide phosphorus
are found on the roots of plants, primarily legumes, that form a symbiosis with nitrogen-fixing bacteria. Under nitrogen-limiting conditions, capable plants form a symbiotic relationship with a host-specific strain of bacteria known as rhizobia. Nitrogen fixation in the nodule is very oxygen sensitive.