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I1, I2, I3, etc

Symbol used to designate the first, second, third Inbred generations, etc.


An ideal plant type used as a model for selective breeding to develop specific plant characteristics desired or required in particular ecosystems.


A 2:1 layered clay in which a negative charge caused by ion substitution is neutralized by potassium ions.


The process of absorbing or taking in water as in drinking.

Immature grains

Grains with still greenish caryopsis or brown rice.


The conversion of an element from inorganic form to organic form in microbial tissues so that the element is not readily available to plants.


Completely resistant to pest or disease of the plant.

Imperfect flower

Lacking a pistil or stamen.


Incapable of being penetrated. Resistant to penetration by fluids or by roots.

Import permit

A document allowing a person to order and receive a thing from another country. Used in seed exchange.

Improved cultivar

A rice variety that has been bred to increase production.

Improved plant type

Specific morphological and physiological features of the rice plant that make it more efficient and higher yielding.

Improved seed

New seed which was developed to increase production, more resistant to pests and diseases when compared to old seed.

Improved varieties

New species of plants which are stronger, or more productive than old species. The rice varieties that has been bred to increase production.

In situ

In the natural or original location.

In situ hybridization

A technique used for hybridization of cytological(chromosome) preparations with the labeled DNA probes. The method couples molecular biology, biochemistry, and cytology. Usually the expression of a gene (as RNA) or the location of target DNA (for example, in a chromosome) is detected by a molecular probe. The probe can be labeled by a variety of biochemical methods.

In vitro

Outside the living cell. In a test tube or other artificial medium. Denotes the growth of explants in glass or other artificial environment.

In vitro selection

Selection for phenotypes (traits) expressed at the cellular or callus level which usually possess genetic changes that control the trait.

In vivo

In real life; in the living cell.


An individual resulting from the mating of closely related parents or selfing.

Inbred line

A nearly homozygous breeding line produced by continued self-fertilization.


The interbreeding of closely related individuals occurring naturally (as in a closed population), or as a deliberately chosen system of breeding and serving especially to preserve and fix desirable characters of and to eliminate unfavorable characters from a suitably selected stock but tending to effect an unwanted decline (as in size, vigor, or fertility) through the fixation of undesirable and often recessive characters when the initial stock is any way defective.

Inbreeding depression

Continuous breeding of genetically related individuals resulting in decrease in reproductive capacity.


A plant that is unable to set seed or units when selfed, crossed, or grafted because of structural, physiological, or ontogenic reasons.

Incomplete dominance

Two different alleles (e.g., dominant and recessive gene) producing an intermediate effect compared with effect of the dominant alleles.

Incomplete fertilizer

A classification of fertilizers that contains only 1 or 2 of the major fertilizer elements N, P, and K.

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