Louisiana State University LSU Digital Commons LSU Historical Dissertations and Theses Graduate School 1981 Resistant Germplasm in Gossypium Species and Related Plants to the Reniform Nematode. Choi-pheng Yik Louisiana State University and Agricultural & Mechanical College Follow this and additional works at: https://digitalcommons.lsu.edu/gradschool_disstheses Recommended Citation Yik, Choi-pheng, "Resistant Germplasm in Gossypium Species and Related Plants to the Reniform Nematode." (1981). LSU Historical Dissertations and Theses. 3622. https://digitalcommons.lsu.edu/gradschool_disstheses/3622 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 This was produced from a copy of a document sent to us for microfilming. 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Ml 48106 18 BEDFORD ROW, LONDON WC1R 4EJ, ENGLAND 8117652 Ym, C h o i -Ph e n g RESISTANT GERMPLASM IN GOSSYPIUM SPECIES AND RELATED PLANTS TO THE RENIFORM NEMATODE The Louisiana State University and Agricultural and Mechanical PhDCol . 1981 University Microfilms International300 N. Zeeb Road, Ann Aibor, MI 48106 PLEASE NOTE: In all cases this material has been filmed in the best possible way from the available copy. Problems encountered with this document have been identified here with a check mark . 1. Glossy photographs or pages 2. Colored illustrations, paper or print______ 3. Photographs with dark backgroundi s " 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 page 7. Indistinct, broken or small print on several pages______ 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 numberedI___________ . Text follows. 14. Curling and wrinkled pages 15. Other University Microfilms International R e s i s t a n t g e r m p l a s m i n g o s s y p i u m s p e c i e s a n d RELATED PLANTS TO THE RENIFORM NEMATODE\ 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 Plant Pathology and Crop Physiology by Choi-Pheng Yik B.S., Louisiana State University, 1975 M.S., Louisiana State University, 1977 May, 1981 ACKNOWLEDGEMENTS I wish to express appreciation to Dr. Wray Birchfield for his guidance, advice, constant encouragement throughout this research, and in preparation of the manuscript. Special thanks are extended to Dr. Jack E. Jones of the Agronomy Department, for his guidance, helpful suggestions and providing the seeds needed in the research. I wish to thank Dr. W. J. Martin, Dr. Shirley Tucker, Dr. J. P. Hollis, and Dr. M. C. Rush for advice and helpful criticisms for improving the manuscript. Acknowledgement is due the Agricultural Experimental Station, Louisiana State University, for providing an assistantship, and the United States Department of Agriculture for the use of facilities. I am deeply grateful to my mother and family for their understanding and continuous encouragement during my studies in the United States. I extend appreciation to the faculty, staff, and graduate students of Plant Pathology & Crop Physiology and Botany Departments for their generous assistance, stimulating interest, and friendship. ii \ TABLE OF CONTENTS PAGE ACKNOWLEDGEMENTS...................................... ii LIST OF T A B L E S .......................................iv LIST OF FIGURES.................................... v LIST OF P L A T E S ........................ vi ABSTRACT . ....................................... vii INTRODUCTION ...................................... 1 REVIEW OF LI T E R A T U R E .............................. 3 MATERIALS AND METHODS................................ 13 RESULTS.............................................. 19 PLATES .............................................. 49 DISCUSSION .......................................... 66 LITERATURE C I T E D ............... 73 VITA ................................................ 80 lii LIST OF TABLES TABLE PAGE 1. Egg production of Rotylenchulus reniformis on check plants, Gossypium hirsutum Deltapine 16.......... 20 2. Egg production of Rotylenchulus reniformis on Malvaceous plants .................................... ....... 22 3. Correlation coefficients between root weights of reniform nematode infected plants and egg production..............31 4. Egg production of Rotylenchulus reniformis on Gossypium species and host reaction ........... 33 5. Egg production of Rotylenchulus reniformis in race stocks of Gossypium hirsutum and host r e a c t i o n .................. 34 6. Egg production of Rotylenchulus reniformis on strains and cultivars of Upland cotton (Gossypium hirsutum) and host reaction .......................................... 37 7. Egg production of Rotylenchulus reniformis on Gossypium arboreum L. and host reaction.............................. 38 8. Egg production of Rotylenchulus reniformis on Gossypium herbaceum L. and host r e a c t i o n ....... ."..................39 9. Egg production of Rotylenchulus reniformis on Gossypium barbadense L. and host reaction . ......................... 40 10. Egg production of Rotylenchulus reniformis on Hibiscus species and host r e a c t i o n ....................... 41 11. Egg production of Rotylenchulus reniformis on plants of Malvaceae and host reaction................ 42 12. Egg production of Rotylenchulus reniformis in relation to host p l a n t s .............................................. 44 iv LIST OF FIGURES FIGURE PAGE 1. Egg production of Rotylenchulus reniformis on Gossypium hirsutum Deltapine 16 from February to December, 1980 . 21 v LIST OF PLATES PLATE PAGE 1. Reniform nematode female development in susceptible cotton and resistant plants..... .................... 49 2. Susceptible tissue reactions to reniform nematode in Gossypium hirsutum Deltapine 1 6 .............. 51 3. Root sections of Gossypium hirsutum cultivars infected by reniform nematodes........... ........................52 4. Root sections of wild Gossypium species infected with reniform nematodes ...................................... 54 5. Root sections of Gossypium arboreum and Gossypium herbaceum infected with reniform nematodes ............... 56 6. Root sections of highly resistant Gossypium barbadense Texas 1 1 0 ................................................ 58 7. Root sections of Hibiscus species infected with the reniform-nematodes ...................................... 60 8. Root sections of reniform nematodes infected Hibiscus species .......................................... 62 9. Root sections of Malvaceous plants infected with reniform nematodes ...................................... 64 vi ABSTRACT All commercial cotton varieties are susceptible to the reniform nematode (RN), Rotylenchulus reniformis Linford & Oliveira 1940. The parasites cause 30-60% crop loss in infested fields. Resistant varieties, if found, offer the best control for this nematode. The objective of this research was to identify RN resistant germplasm in cotton species and related plants, and to investigate host parasite relationships. The 200 plants tested for RN resistance were 111 entries of G .