. Bulletin of the Department of Agriculture. Agriculture; Agriculture. s^&t^su k BULLETIN No. 869 Contribution from the Bureau of Plant Industry WM. A. TAYLOR, Chief. Washington, D. C. PROFESSIONAL PAPER September 30, 1920 THE INHERITANCE OF THE LENGTH OF INTER- NODE IN THE RACHIS OF THE BARLEY SPIKE. By H. K. Hayes, Head of Section of Plant Breeding, Division of Agronomy and Farm Management, College of Agriculture, University of Minnesota, and Harry V. Har- lan, Agronomist in Charge of Barley Investigations, Office of Cereal Investigations. CONTENTS. Scope of the experiments Historic
. Bulletin of the Department of Agriculture. Agriculture; Agriculture. s^&t^su k BULLETIN No. 869 Contribution from the Bureau of Plant Industry WM. A. TAYLOR, Chief. Washington, D. C. PROFESSIONAL PAPER September 30, 1920 THE INHERITANCE OF THE LENGTH OF INTER- NODE IN THE RACHIS OF THE BARLEY SPIKE. By H. K. Hayes, Head of Section of Plant Breeding, Division of Agronomy and Farm Management, College of Agriculture, University of Minnesota, and Harry V. Har- lan, Agronomist in Charge of Barley Investigations, Office of Cereal Investigations. CONTENTS. Scope of the experiments Historical review Pure-line varieties used in these studies Reliability of experimental methods Effects of environment and varying sources of seed on density Purity of parental forms Page. 1 1 3 4 Page. Inheritance of length of internodes in crosses between pure lines 9 Summary of results 20 Discussion of results 21 Conclusions 24 Literature cited 25 SCOPE OF THE EXPERIMENTS. In 1915 a series of studies on the inheritance of the length of internode in the rachis of the barley spike was begun in cooperation with the Minnesota Agricultural Experiment Station. Internode length is a particularly favorable character for such investigations, as a large number of varieties furnish many gradations in internode length and in a pure line the average internode length of the rachis varies comparatively little from year to year. The project was undertaken for two main reasons, (1) as a study of inheritance in an unusually favorable size character and (2) as a contribution to the question of the taxonomic value of the length of internode of the rachis. HISTORICAL REVIEW. The length of internode is frequently referred to as density, and both terms are used in this bulletin. As far back as Linnseus, species were differentiated by this character. With fertility, it has been, consciously or unconsciously, one of the main bases of classification 182694°—20—Bull. 869 1. Please note that these images
Size: 1710px × 1461px
Photo credit: © Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauth, bookcentury1900, bookdecade1910, booksubjectagriculture
