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The Response of Saccharum Species to Growth Regulators Used As Tillering Agents (Sugarcane). Keith P

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The Response of Saccharum Species to Growth Regulators Used As Tillering Agents (Sugarcane). Keith P Louisiana State University LSU Digital Commons LSU Historical Dissertations and Theses Graduate School 1986 The Response of Saccharum Species to Growth Regulators Used as Tillering Agents (Sugarcane). Keith P. Bischoff Louisiana State University and Agricultural & Mechanical College Follow this and additional works at: https://digitalcommons.lsu.edu/gradschool_disstheses Recommended Citation Bischoff, Keith P., "The Response of Saccharum Species to Growth Regulators Used as Tillering Agents (Sugarcane)." (1986). LSU Historical Dissertations and Theses. 4284. https://digitalcommons.lsu.edu/gradschool_disstheses/4284 This Dissertation is brought to you for free and open access by the Graduate School at LSU Digital Commons. It has been accepted for inclusion in LSU Historical Dissertations and Theses by an authorized administrator of LSU Digital Commons. For more information, please contact [email protected]. INFORMATION TO USERS While the most advanced technology has been used to photograph and reproduce this manuscript, the quality of the reproduction is heavily dependent upon the quality of the material submitted. For example: • Manuscript pages may have indistinct print. In such cases, the best available copy has been filmed. • Manuscripts may not always be complete. In such cases, a note will indicate that it is not possible to obtain missing pages. • Copyrighted material may have been removed from the manuscript. In such cases, a note will indicate the deletion. Oversize materials (e.g., maps, drawings, and charts) are photographed by sectioning the original, beginning at the upper left-hand comer and continuing from left to right in equal sections with small overlaps. 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Colored illustrations, paper or ______print 3. Photographs with dark background_____ 4. Illustrations are poor copy_______ 5. Pages with black marks, not original copy______ 6. Print shows through as there is text on both sides of p_______ a g e 7. Indistinct, broken or small print on several oaoes\/ 8. Print exceeds margin requirements______ 9. Tightly bound copy with print lost in_______ spine 10. Computer printout pages with indistinct______ print 11. Page{s)___________ lacking when material received, and not available from school or author. 12. Page(s)___________ seem to be missing in numbering only as text follows, 13. Two pages num bered . Text follows. 14. Curling and wrinkled pages______ 15. Dissertation contains pages with print at a slant, filmed as received_________ 16. Other_______________________________________________________________________ University Microfilms International THE RESPONSE OF SACCHARUM SPECIES TO GROWTH REGULATORS USED AS TILLERING AGENTS A Dissertation Submitted to the Graduate Faculty of the Louisiana State University and Agricultural and Mechanical College in partial fulfillment of the requirements for the degree of Doctor of Philosophy in The Department of Agronomy by Keith P. Bischoff B.S., Louisiana State University, 1976 December 1986 ACKNOWLEDGEMENTS The author wishes to express his sincere appreciation to Dr. Freddie Martin, Professor of Agronomy, Louisiana State University, for his guidance and help in conducting this study, and for his suggestions in the preparation of this dissertation. Acknowledgements are also given to Dr. Edward P. Dunigan, Head, Department of Agronomy, J. Preston Jones, former head, Department of Agronomy, and the American Sugar Cane League for providing financial support for this study. Special recognition and thanks are given to Jack Berg, Edwis Dufrene and Joey Quebedeaux, Research Associates, and Kenneth Gravois and Scott Milligan, fellow graduate students, for their assistance throughout the course of this study. The author would also like to extend gratitude to Veronica Taylor, Research Associate, Department of Experimental Statistics; Dr. Benjamin Legendre, Research Agronomist, U.S.D.A. Sugarcane Field Laboratory, Houma, Louisiana; the staff of the St. Gabriel Research Station; and to A. J. Williams for her help in preparing this document. Finally, the most sincere appreciation is extended to the author's wife Beleta, daughter Kori Lynn and parents Frank and Lucia for their patience and constant encouragement without which this dissertation would not have been possible. TABLE OF CONTENTS Topic Page ACKNOWLEGEMENTS..................................................... ii LIST OF TABLES ..................................................... iv LIST OF FIGURES ................................................... vi ABSTRACT ........................................................... ix PART I. TILLERING AGENT BY GENOTYPE INTERACTION ................. 1 INTRODUCTION ....................................................... 2 REVIEW OF LITERATURE.............................................. 4 Plant Growth Regulators and Sugarcane ....................... 5 MATERIALS AND METHODS.............................................. 8 RESULTS AND DISCUSSION .................................... 14 Plant Cane Results............................................ 14 Ratoon Results................................................ 25 Overall Discussion............................................ 59 SUMMARY AND CONCLUSIONS............................................ 66 PART II. BEHAVIOR OF TILLERING RESPONSE TO ETHEPHON TREATMENT IN TWO SEGREGATING POPULATIONS............... 68 INTRODUCTION ....................................................... 69 MATERIALS AND METHODS ............................................ 70 RESULTS AND DISCUSSION............ 73 SUMMARY AND CONCLUSIONS............................................ 81 REFERENCES......................................................... 82 APPENDIX ........................................................... 84 VITA ............................................................... 87 iii LIST OF TABLES PART ONE Page Table 1. Sa.ccha.rtm species and respective cultivar designations which were utilized in the testing of plant growth regulators as tillering agents......................... 9 Table 2. Growth regulators tested for ability to increase tillering in Saccharua species and their rates of application .................................. ..... 10 Table 3. The analysis of variance for mean shoot number data of the plant cane experiments . ............ 15 Table 4. Effects of growth regulators on mean number of shoots produced by cultivars of different Saccharuzn species in the plant cane experiment........................... 16 Table 5. Growth regulator treatment effects on Saccharua species as indicated by mean shoot number and percent increase over the check in plant c a n e ................. 18 Table 6. Mean heights of untreated plants for the fourteen cultivars of the four Saccharua species, after eight weeks, in the plant cane experiment............. 20 Table 7. Analysis of variance for difference in height measurements for plant c a n e ........................... 22 Table 8. Difference in height (DHT) measurements for the variety by treatment interaction of Saccharua cultivars in experiment one . ....................... 23 Table 9. Difference in height (DHT) measurements for the variety by treatment interaction of Saccharua cultivars in experiment t w o ........................... 24 Table 10. Analysis of variance for mean shoot number of the ratoon experiment ...................................... 40 Table 11. The variety by treatment interaction for mean number of shoots produced by plants of cultivars of different Saccharua species in the ratoon experiment............. 41 Table 12. Growth regulator treatment effects on Saccharua species as indicated by mean shoot number and percent increase over the check in the ratoon experiment............... 43 Table 13. Mean heights for fourteen untreated cultivars of four Saccharua species in the ratoon experiment............. 60 iv Table 14. Analysis of variance for difference in height measurement for the ratoon experiment ................. 61 Table 15. Difference in height (DHT) measurements for variety by treatment interaction of Saccharua cultivars in the ratoon experiment .................................. 62 Table 16. Correlation coefficients showing the relationship of mean height of the untreated species to mean number of shoots of the treated species in the plant cane and ratoon experiments ..... ................. 65 PART TWO Table 1. Parentage of the half-sib families utilized in the study of ethephon response............................. 71 Table 2. Analysis of variance table for mean shoot number data of parental cultivars
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