. Bulletin of the Department of Agriculture. Agriculture; Agriculture. UNITED STATES DEPARTMENT OF AGRICULTURE j| BULLETIN No. 1062 jijrr Contribution from the Bureau of Plant Industry T9Cl ^.J.^* WM. A. TAYLOR, Chief, in cooperation with Purdue Univer- ' ^^ *s> ^"*» sity Agricultural Experiment Washington, D. C. PROFESSIONAL PAPER April 22, 1922 RELATION OF THE CHARACTER OF THE ENDO- SPERM TO THE SUSCEPTIBILITY OF DENT CORN TO ROOT ROTTING. By Johx F. Trost, Assistant Pathologist, Office of Cereal Investigations, Bu- reau of Plant Industry, and the Department of Botany,
. Bulletin of the Department of Agriculture. Agriculture; Agriculture. UNITED STATES DEPARTMENT OF AGRICULTURE j| BULLETIN No. 1062 jijrr Contribution from the Bureau of Plant Industry T9Cl ^.J.^* WM. A. TAYLOR, Chief, in cooperation with Purdue Univer- ' ^^ *s> ^"*» sity Agricultural Experiment Washington, D. C. PROFESSIONAL PAPER April 22, 1922 RELATION OF THE CHARACTER OF THE ENDO- SPERM TO THE SUSCEPTIBILITY OF DENT CORN TO ROOT ROTTING. By Johx F. Trost, Assistant Pathologist, Office of Cereal Investigations, Bu- reau of Plant Industry, and the Department of Botany, Purdue University Agricultural Experiment Station. CONTENTS. Page. Ear classification based on starehi- ness Relation of endosperm character and ear infection Page. Relation of kernel starehiness to pathological performance 4 Susceptibility of disease-free seed ears '. 5 Summary 7 EAR CLASSIFICATION BASED ON STARCHINESS. Early in the course of investigations of the root, stalk, and ear rots of corn, differences were observed in the amount of starch in the various ears from which kernels were being germinated to determine the extent and character of seed-ear infections. These differences were noticeable not only among different varieties, but often equally so among the individual strains within a single variety. It seemed important to determine what physical characters of the ear or kernel, if any, might be used in recognizing and eliminat- ing infected seed ears. Obviously, such a procedure would be val- uable in reducing the necessity for a detailed germination test of each ear. The cars were classified on the basis of the endosperm. The PChy endosperm appears opaque when the kernel is held up to the light, hut the portion containing horny endosperm is more or less translucent. Six degrees or types of starehiness were recognized and B«451 22. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - colorati
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