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Botany --- -Plant ecology --- -Botany --- Plants --- Ecology --- Botanical science --- Phytobiology --- Phytography --- Phytology --- Plant biology --- Plant science --- Biology --- Natural history --- History --- -History --- -Ecology --- Plant ecology --- Germany --- 19th century --- Phytoecology --- Vegetation ecology --- Floristic botany --- Floristic ecology

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Wheat, which is the second most important cereal crop in the world, is being grown in a wide range of climates over an area of about 228 945 thou­ sand ha with a production of about 535 842 MT in the world. Bread wheat (Triticum aestivum L. ) accounts for 80% of the wheat consumption, howe­ ver, it is attacked by a large number of pests and pathogens; rusts and smuts cause enormous damage to the crop and reduce the yield drastically in some areas. The major breeding objectives for wheat include grain yield, earliness, resistance to lodging and diseases, spikelet fertility, cold tolerance, leaf duration and net assimilation rate, fertilizer utilization, coleoptile length, nutritional value, organoleptic qualities, and the improvement of charac­ ters such as color and milling yield. The breeding of wheat by traditional methods has been practiced for centuries, however, it has only now come to a stage where these methods are insufficient to make any further breakthrough or to cope with the world's demand. Although numerous varieties are released every year around the world, they do not last long, and long-term objectives cannot be realized unless more genetic variability is generated. Moreover, the intro­ duction of exotic genetic stocks and their cultivation over large areas results in the depletion and loss of the native germplasm pool.

Triticum --- Blé --- Wheats --- Biotechnologie --- Biotechnology --- Hybridation --- Hybridization --- Culture d'embryon --- Embryo culture --- Culture d'anthère --- Anther culture --- Triticosecale --- Méthode d'amélioration génétique --- breeding methods --- Culture in vitro --- In vitro culture --- Multiplication des plantes --- Plant propagation --- Multiplication végétative --- Vegetative propagation --- Thinopyrum --- Wheat --- Basic Sciences. Biotechnology --- Biotechnology. --- Micropropagation. --- Plant Biotechnology --- Plant Biotechnology. --- Propagation --- In vitro --- Agriculture. --- Forests and forestry. --- Botany. --- Zoology. --- Cytology. --- Forestry. --- Plant Sciences. --- Cell Biology. --- Plant science. --- Cell biology. --- Plant Science.

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AMC Central America --- Belize ( formerly British Honduras ) --- Central America --- Chiapas --- Costa Rica --- El Salvador --- Guatemala --- Honduras --- Nicaragua --- Panama --- Tabasco --- Yucatan --- glossaries --- Botany --- English language --- Spanish language --- Castilian language --- Romance languages --- Germanic languages --- Botanical science --- Phytobiology --- Phytography --- Phytology --- Plant biology --- Plant science --- Biology --- Natural history --- Plants --- Dictionaries --- Dictionaries&delete& --- Spanish --- English --- Floristic botany --- BOTANIQUE --- DICTIONNAIRES ESPAGNOLS --- DICTIONNAIRES ANGLAIS

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Orchidaceae --- Orchideeën --- Orchids --- Orchidées --- Botany --- Bibliography --- Pictorial works --- 582.594.2 <43> --- 582.594.2 <01> --- -Orchids --- -Botany --- -Botanical science --- Phytobiology --- Phytography --- Phytology --- Plant biology --- Plant science --- Biology --- Natural history --- Plants --- Orchidales --- Orchidaceae. Orchids--Duitsland voor 1945 en na 1989 --- Orchidaceae. Orchids--Bibliografieën. Catalogi --- Bibliography. --- Pictorial works. --- -Orchidaceae. Orchids--Duitsland voor 1945 en na 1989 --- 582.594.2 <01> Orchidaceae. Orchids--Bibliografieën. Catalogi --- 582.594.2 <43> Orchidaceae. Orchids--Duitsland voor 1945 en na 1989 --- Botanical science --- Floristic botany --- JENA --- ORCHIDACEAE --- MONOGRAPHS

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Botan. systematics, taxonomy, nomencl. --- Botany --- Botanique --- Classification --- 57.06 --- -Botanical science --- Phytobiology --- Phytography --- Phytology --- Plant biology --- Plant science --- Biology --- Natural history --- Plants --- Nomenclature and classification of organisms. Taxonomy --- Classification. --- SYS General Systematics --- general systematics --- -Nomenclature and classification of organisms. Taxonomy --- 57.06 Nomenclature and classification of organisms. Taxonomy --- -57.06 Nomenclature and classification of organisms. Taxonomy --- Botanical science --- Botanical classification --- Botanical systematics --- Botanical taxonomy --- Plant biosystematics --- Plant classification --- Plant systematics --- Plant taxonomy --- Systematic botany --- Systematics (Botany) --- Taxonomy, Plant --- Plant taxonomists --- PLANT TAXONOMY --- CLADISTICS --- PHYLETICS --- PHENETICS --- TEXTBOOKS