- 行业: Agriculture
- Number of terms: 29629
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1). A group of cultivated plants within a species which is distinguished from another variety (group) by any characters (morphologic, physiological, biochemical, or other) of significance to agriculture and which, when reproduced, retains its distinguishing characters. A variety may be derived from several pure lines which have many common features and are reasonably uniform in appearance (but not necessarily genetically pure). 2). A group of similar plants which, by structural features and performance, may be identified from other varieties (groups) in the same species. It differs from a breeding line in that it has been named and made commercially available to farmers. 3). A subdivision of a species; a group of individuals within a species which are distinct in form or function from other similar arrays of individuals in commercial production. Variety is synonymous with cultivar.
Industry:Agriculture
1). An organism that carries pathogens from one host to another. 2). An insect that transmits a disease. 3). A self-replicating DNA molecule that serves to transfer a DNA segment into a host cell in recombinant DNA technology.
Industry:Agriculture
Referring to asexual (stem, leaf, root) development in plants in contrast to sexual (flower, seed) developmen
Industry:Agriculture
Resistance controlled by one or a few major genes, in which varieties with this type of resistance are usually highly resistant to one or several pathogen races or several disease races or insect biotypes of a given species but are susceptible to others. A type of resistance which is expressed against only some biotypes of a pest species and is governed by one or more genes in the host plant, each of which corresponds to a matching gene for parasitic ability in the pest species, sometimes called gene-for-gene resistance (See also Horizontal resistance).
Industry:Agriculture
Small, low-molecular weight ribonucleic acid that can infect plant cells, replicate themselves, and cause disease.
Industry:Agriculture
To control the amount and depth of water in the ricefield during the required time necessary for crop growth.
Industry:Agriculture
1). Expressed in terms of dry matter or harvested portion of the crop produced per unit of water consumed. 2). Ratio of the water used for evapotranspiration, seepage, and percolation to the sum of rainfall and irrigation supply.
Industry:Agriculture
