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Home >>Botany Dictionary>>UDP - Uva

UDP - Uridine diphosphoglucose.

Ultrastructure (fine structure). The structural details of cells below the limit of resolution of light microscope. It is revealed only by electron microscope.

Ultramicrob - An agent of obscure nature which may cause disease in organisms, but too small to be seen with an ordinary light-­microscope.

Umbel - A sort of raceme in which the chief stem makes no growth between the flowers so that they come from about the same point, forming a flat or arched flower head with the first­ formed flowers on the outside, the latest in the middle.

Umbellate - Used for having the characters of an umbel.

Umbilicate - Used for peltate and depressed in the centre.

Uredisotage - The phase in the life history of a rust fungus if uredospores are formed.

Uridine=Ribose-3-Uracil - A nucleoside which is formed from ribose and uracil.

Uridine Diphosphate (UDP) - See uridine diphosphoglucose.

Undulipodia - The collective term which is used for flagella and cilia because of similar (9+2) structure in both.

Unifliolate (of leaves). Compound but of which all but one of the last undergo no development so that it appears to be simple.

Unijugate - Used for a compound leaf which has one pair of leaflats.

Unilateral - (1) Coming from one side or direction only.
(2) A receme in which all the flowers turned to one side.

Unilocular - Having one nucleus.

Unilocular Sporangium - Used for a type of sporangium in brown algae \Laminaria Ectocorpus etc., which has only one locule and is not divided into compartments. Compare plurilocular sporangium.

Unsymmetrical - Used for a flower in which all the parts are not regular.

Uredosorus (uredium). The sours in which uredospores get clustered. Formed on the host plant which gets infected by certain rusts e.g., Puccinia. Their characteristic shape, colour ;etc., are of diagnostic value.

Uredospore (urediospore). A dikaryotic spore which is formed in a sours (Uredosorus) by certain rust fungi e.g., Puccinia gram­inis on the infected host plant. When the spores are released, these spores again infect another healthy plant thereby spread­ing the diseases in the same growing season.

Unisexual - (1) Of one sex only, male or female, not the two together.
(2) Having the male and female parts in separate flowers.

Unit Character - Used for one whose difference from an alternative gets transmitted as a unit in heredity. These are independent characters which could be traced in each generation, and assorted and distributed by the laws of chance.

Universal Veil - The membrane enclosing the fruiting body in many basidiomycete fungi. It ruptures by elongation of stalk, and the remnants are forming the volva at the base of the stalk and flecks of tissue on the upper surface of the cap e.g., in Agaricus.

Uridine Diphosphoglucose (UDPG) - In carbohydrate metabo­lism glucose-l phosphates converted to UDPG in the pres­ence of UDP.

Urn - The capsule of a moss.

Urticle - A small fruit in which the pricarp is free from the seed.

Urticle - (1) A little bag-like hallow part e.g., those seen on the leaves of some water plants in which smaller animals are taken prisoner.
(2) A dry, generally, one seeded fruit is a thin, dry, hollow cover or such a cover itself.

Uva - A berry formed from a superior orary, such as that from which most wine is made.

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