Fundamentals of Plant-breedingD. A. Appleton, 1914 - 346 стор. |
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acters agriculture animals appear artificial selection average bacteria become body breeding called cereals changes chapter characters chiefly chromosomes combination continuous crop crossing cultivated plants Darwin's desirable developed DeVries discovered disease-resistant drought drought-resistant evident evolution example experimental experiments F₂ fact factor fertilized egg forest forms fruit fungicides fusion gametes gametophyte genetics germinate growth Gymnosperms heredity host hybrid illustration immune important improvement increase indi individuals infections inheritance investigators kind maize mass selection means Mendel's law method mixture mutation mycelium natural selection obvious organs orthogenesis parasite parent pedigree culture plant diseases plant-breeding plasm pollen possible problem produced progeny propagated protoplast pure strains purple races ratio regions reproductive cells resistant result scientific secure seed sexual cells sexual reproduction soil species sperm spores station supply Svalöf theory tion trees tubers variation variety vary vegetative activity viduals vigor wheat rust wild wheat X chromosome xylem zygote
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Сторінка 30 - It is interesting to contemplate an entangled bank, clothed with many plants of many kinds, with birds singing on the bushes, with various insects flitting about, and with worms crawling through the damp earth, and to reflect that these elaborately constructed forms, so different from each other, and dependent on each other in so complex a manner, have all been produced by laws acting around us.
Сторінка 30 - Variability from the indirect and direct action of the conditions of life, and from use and disuse : a Ratio of Increase so high as to lead to a Struggle for Life, and as a consequence to Natural Selection, entailing Divergence of Character and the Extinction of less-improved forms.
Сторінка 31 - Thus, from the war of nature, from famine and death the most exalted object which we are capable of conceiving, namely, the production of the higher animals, directly follows. There is grandeur in this view of life with its several powers, having been originally breathed by the Creator into a few forms or into one; and that, whilst this planet has gone cycling on according to the fixed law of gravity, from so simple a beginning endless forms most beautiful and most wonderful have...
Сторінка 291 - Weather Bureau Bureau of Animal Industry Bureau of Plant Industry Forest Service Bureau of Chemistry Bureau of Soils Bureau of Entomology Bureau of Biological Survey...
Сторінка 291 - ... one of the earlier reports of the present Secretary of Agriculture he set forth the policy with respect to plant-industrial work. It was stated that it would be the aim of the department to bring the scientist to the help of the people; to ascertain what imported crop plants might be produced in our country; to search the world for grains, fruits, vegetables, grasses, and legumes that might be found useful here; to secure new varieties of plants by breeding and selection; to control destructive...
Сторінка 289 - All importations under regulation 14 must be made under special permits through the office of Foreign Seed and Plant Introduction of the Department of Agriculture, but for the use of the individual Importer.
Сторінка 291 - ... in its publications have added many millions to the wealth of the Nation. PLANT INDUSTRY. OUTLINES OF POLICY. In one of the earlier reports of the present Secretary of Agriculture he set forth the policy with respect to plant-industrial work. It was stated that it would be the aim of the department to bring the scientist to the help of the people; to ascertain what imported crop plants might be produced in our country; to search the world for grains, fruits, vegetables, grasses, and legumes that...
Сторінка 280 - COOK. Bionomist in Charge of Office of Crop Acclimatization, Bureau of Plant Industry. US Department of Agriculture, Washington, DC DAVID FAIRCHILD, Agricultural Explorer in Charge of Foreign Seed and Plant Introduction, Bureau of Plant Industry, US Department of Agriculture, Washington, DC GEORGE M.
Сторінка 124 - After eight years of work he published his results in 1865, in the Proceedings of the Natural History Society of Briinn, under the title "Versuche iiber Planzenhybriden.
Сторінка viii - to those who wish a simple statement of evolution and heredity; who wish Information concerning the revolution in plantbreeding; or who wish a general introduction to the fundamental principles underlying agriculture.