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The Occurrence of Strains Resistant to Leaf Rust in Certain Varieties of Wheat 1
Author(s) -
Johnston C. O.
Publication year - 1929
Publication title -
agronomy journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.752
H-Index - 131
eISSN - 1435-0645
pISSN - 0002-1962
DOI - 10.2134/agronj1929.00021962002100050007x
Subject(s) - agricultural experiment station , citation , library science , rust (programming language) , state (computer science) , horticulture , agriculture , mathematics , agronomy , biology , geography , computer science , algorithm , archaeology , programming language
In recent years plant breeders and others interested in the improvement of crop pla’nts have relied principally on the use of controlled hybridization to obtain the characters desired. Before the practical application of the Mendelian principles of heredity came into such general use considerable improvement of crops had been accomplished through selection. Many crops had been improved in yield, quality, and other agronomic characters by int, elligent selection. The .widespread adoption of hybridization by modern plant breeders, however, has resulted in lessening the emphasis on the older methods of crop improvement. The purpose of this paper, therefore, is to call attention to the use which has been made of selection in the production of strains of wheat resistant to a known physiologic form of leaf rust (Puccinia triticina Eriks., p. f. 9). The results here reported emphasize the value of that method in certain types of crop-improvement experiments. Several investigators (i, 6, 7, 8, 9)3 have reported the occurrence of varieties of wheat resistant to various rusts. In only a few instances, however, has it been clearly pointed out that some ~1~ known varieties, once thought to be susceptible, contaircwrust -~