. Department bulletin. Agriculture; Agriculture. Washington, D. C. April 26,1923 SELF-FERTILIZATION AND CROSS-FERTILIZATION IN PIMA COTTON Bj THOMAS H. KEARNEY, Physiologist in Charge of Alkali and Drought Resistant Plant Investigations, Bureau of Plant Industry CONTENTS Page Introduction 1 Viciniim, or natural hybridization, in cotton 2 Structure of the flower in relation to pollination ... 12 Ontogeny of the flower in relation to pollination ... 16 Locus of pollen deposition in relation to self-fertilization and cross-fertilization 27 Relative earliness of arrival of self-deposited and of in
. Department bulletin. Agriculture; Agriculture. Washington, D. C. April 26,1923 SELF-FERTILIZATION AND CROSS-FERTILIZATION IN PIMA COTTON Bj THOMAS H. KEARNEY, Physiologist in Charge of Alkali and Drought Resistant Plant Investigations, Bureau of Plant Industry CONTENTS Page Introduction 1 Viciniim, or natural hybridization, in cotton 2 Structure of the flower in relation to pollination ... 12 Ontogeny of the flower in relation to pollination ... 16 Locus of pollen deposition in relation to self-fertilization and cross-fertilization 27 Relative earliness of arrival of self-deposited and of insect- carried pollen 31 Deposition of self pollen and of foreign pollen by insects . 34 Pollen-carrying insects at Saealon 36 Relative compatibility of like and of unlike pollen . 38 Page Pollen competition as a factor in self-fertiliiation and cross-fertilization 42 Relative completeness of insect pollination at different localities 49 Seasonal variations in relative completeness of fertilization. 51 The inferior fertilization of bagged flowers S3 Boll shedding in relation to pollination and ferl lization . 55 Inbreeding in relation to fertility SS Summary 61 Literature cited 66 WASHINGTON GOVERNMENT PRINTING OFFICE 192). Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original United States. Dept. of Agriculture. Washington, D. C. The Dept. : Supt. of Docs. , G. P. O.
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