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Based on an exhaustive collection of terms from various sources, RiceVocs - A Compendium of Rice related vocabulary has been developed. This document along with Information Architecture is used for tagging purposes to make RKMP a semantic portal.

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Capable of cross fertilization or having cross fertilizing nature.


Fertilisation by pollen from different flowers or from flowers of genetically different plants of the same species.


A polyploid containing genetically different sets of chromosomes from two or more species, e.g., O. minuta with BBCC genomes is an allopolyploid.


An enzyme which exists in multiple electrophoretic forms either because of allelic variation within one polypeptide or multimeric associations of variant forms. Similar or identical catalytic activities occur within the same organism. - An enzyme which exists in multiple electrophoretic forms either because of allelic variation within one polypeptide or multimeric associations of variant forms. Similar or identical catalytic activities occur within the same organism.


Pertaining to alluvium; a clayey, silty, sandy, or gravely material deposited by a stream or other bodies of running water.

Alluvial fan

A fan or cone-shaped mass of sand and gravel deposited by a stream where it emerges from a narrow valley and spreads on to a plain or wide valley.

Alluvial soil

Soil that has been deposited by any form of running water.


Mineral material (sand, silt, and clay) deposited by rivers.

Alternate host

An individual or plant other than the main or preferred host upon which a parasite (or its spores, eggs, larvae, etc.) or a disease organism (pathogen) could live.

Alternate wetting and drying

Alternate wetting and drying (AWD) is a type of water-saving rice production system. In this system, the field is irrigated with enough water to flood the paddy for 3-5 days, and, as the water soaks into the soil, the surface is then allowed to dry for 2-4 days before getting re-flooded. Compared with the traditional continuous flooding system, AWD using lowland rice cultivars can reduce water input by 15-30% without yield loss.

Aman paddy

A term used in Bangladesh and East India for lowland rice grown in the wet season during June to November.


Ambemohar is a rice variant from Western Maharashtra in India. The short cooked grains have a tendency to break easily and stick together. It is popular in Maharashtra due to its strong fragrance reminiscent of mango blossoms, which is noticeable when the rice is cooked.

Ambient air

Air in the surrounding environment.


An interaction between two organisms in which one organism is suppressed by toxins produced by the second.

American wild rice

Not a species of rice. It is a wild grass found in the USA with grains similar to those of rice. Its scientific name is Zizania aquatica.

Amino acid

A substance with both basic and acidic properties synthesized by plants and animals; considered the building blocks of proteins.

Ammonia volatilization

The escape of nitrogen from the soil or floodwater as ammonia gas; causes loss of urea and the ammonium form of nitrogen fertilizer from floodwater or saturated soil surfaces.


1) Plants or organisms resulting from a cross between two different species and having the total chromosome complement of both the parent species. 2) Name given to allopolyploids which are produced when different genomes are combined through interspecific hybridization.


DNA region defined by two opposing primer amplification sites.


The enzyme responsible for catalyzing the breakdown of starch into sugars; may be active in one of two forms: a-amylase and b-amylase.


1) A component of starch that has a high molecular weight, long branched chain structures, and does not tend to gel in aqueous solutions. 2) A type of starch molecule composed of long branched chains of glucose units (a polysaccharide). 3) The major and branched fraction of starch, a glucose polymer with 5,000-19,000 glucose units and mean chain length of 18-22 glucose units. This fraction contributes directly to gel consistency and has a long linear chain fraction in high amylose starch.


1) In cereal endosperm, it is the starch fraction of molecules or residues made up of glucose units, straight short chains. 2) The essentially linear fraction of starch, a polymer of glucose (dextrose) with up to 1,000 glucose units. It gives a blue complex with iodine and contributes directly to cooked rice hardness. It is measured colorimetrically by its blue complex with iodine in acetate buffer.

Amylose content (AC)

The value representing the starch fraction of milled rice, or the amount of starch in the grain that determines its eating and cooking quality. Low amylose rice varieties are moist, sticky, and glossy after cooking. Rice with a high amylose content cooks dry and fluffy.


The absence of molecular oxygen. Anaerobic is a technical word which literally means without air (where "air" is generally used to mean oxygen), as opposed to aerobic.

Analysis of variance (ANOVA)

1) A statistical procedure that allows subdivision of the total variation among experimental units into known sources of variation and provides a measure for each source. 2) The statistical analysis that tests the significance of variable sources.


The stage of cell division (mitosis and meiosis) in which the chromosome halves move toward the opposite poles of the spindle.

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