Incidence, Distribution and Characteristics of Major Tomato Leaf ...

More documents

Recommendations

Info

Incidence, distribution and characteristics of major tomato leaf curl and mosaic virus diseases 112 categories, i.e. leafhopper-transmitted and whitefly-transmitted viruses. ICTV went further to divide family Geminiviridae into four genera. The first genus (Mastrevirus), with one monopartite DNA molecule, contains leafhopper-transmitted viruses of monocotyledonous plants. The type species is Maize streak virus. The second genus (Curtovirus) consists of leafhopper-transmitted viruses, which infect dicotyledonous plants. The type species is Beet curly top virus. The third genus (Begomovirus) consists of whitefly-transmitted viruses of dicotyledonous plants. These have both monopartite and bipartite members. Monopartite viruses are confined to the Old World, while bipartite viruses originally belong to the New World (Padidam et al., 1995). The fourth genus, Topocuvirus, was recently accepted by ICTV and has only one member, Tomato pseudo-curly top virus (Fauquet et al., 2003). From findings of our study, viruses ToLCV-UG and TYLCV-UG found in Uganda belong to family Geminiviridae and genus Begomovirus, and not to any of the other families and genera referred to in this document. Our recent study of similar isolates from Uganda, based on complete sequence comparisons, confirmed that the tomato leaf curl virus is new (Shih et al., 2005). Since it was possible to better understand ToLCV-UG and TYLCV-UG, which cause tomato leaf curl disease in Uganda and hence reduce tomato productivity, future studies would require countrywide sample collection, and sequence pairwise comparisons as well as phylogenies of either complete DNA sequences or the intergenic region and coat protein genes, depending on available resources. Furthermore, to develop appropriate control methods for these begomoviruses, there is a need to better understand the influence of weather conditions, tomato growth stages and tomato management practices on whitefly vector population (Anderson, 1992; Bock, 1982). These aspects of the study are dealt with in Chapter 5.
Incidence, distribution and characteristics of major tomato leaf curl and mosaic virus diseases 113 CHAPTER 5 RELATIONSHIP BETWEEN TOMATO YELLOW LEAF CURL VIRUSES AND THE WHITEFLY VECTOR In this chapter, the objective is to establish TYLCVs (sensu lato) temporal and spatial spread, as well as their relationship with the whitefly vector in a selected tomato agroecosystem in Uganda
Page 1:
Incidence, Distribution and Charact
Page 4 and 5:
Charles SSEKYEWA Incidence, Distrib
Page 6 and 7:
CONTENTS 1 CHAPTER 1...............
Page 8 and 9:
ACKNOWLEDGEMENT The following perso
Page 10 and 11:
vii 7 mosaic virus (CMV), Alfalfa m
Page 12 and 13:
ix 9 Consequently, our findings con
Page 14 and 15:
SAMENVATTING Tomaat is een economis
Page 16 and 17:
xiii 13 Beide genhomologie percenta
Page 18 and 19:
xv 15 dit onderzoek geven ook aan d
Page 20 and 21:
LIST OF TABLES xvii 17 Table Page 1
Page 22 and 23:
ACRONYMS AND ABBREVIATIONS xix 19 A
Page 24 and 25:
Abbreviation Word in full PCR Polym
Page 26 and 27:
Incidence, distribution and charact
Page 28 and 29:
Page 30 and 31:
Page 32 and 33:
Page 34 and 35:
Page 36 and 37:
Table 2.1: The orthography of some
Page 38 and 39:
Page 40 and 41:
Page 42 and 43:
Page 44 and 45:
Page 46 and 47:
Page 48 and 49:
Page 50 and 51:
Page 52 and 53:
Page 54 and 55:
Page 56 and 57:
Page 58 and 59:
Page 60 and 61:
Page 62 and 63:
Page 64 and 65:
Page 66 and 67:
Page 68 and 69:
Page 70 and 71:
Page 72 and 73:
Page 74 and 75:
Page 76 and 77:
Page 78 and 79:
A B Incidence, distribution and cha
Page 80 and 81:
A B Incidence, distribution and cha
Page 82 and 83:
A Incidence, distribution and chara
Page 84 and 85:
Page 86 and 87: Incidence, distribution and charact
Page 106 and 107: Isolate IG1 Incidence, distribution
Page 112 and 113: 1600 500 700 200 Incidence, distrib
Page 126 and 127: 1200 1200 (A) IG1 (ToLCV-UG) PAL1v
Page 132 and 133: 78 Incidence, distribution and char
Page 134 and 135: 87 87 Incidence, distribution and c
Page 144 and 145: A A C D Incidence, distribution and
Page 146 and 147: Opaque and not smeared Translucent
Page 152 and 153: Rainfall (cm) Temp. Cº Mean Whitef
Page 186 and 187:
Page 188 and 189:
Page 190 and 191:
Page 192 and 193:
Page 194 and 195:
Page 196 and 197:
Page 198 and 199:
8 ANNEXES Incidence, distribution a
Page 200 and 201:
Page 202 and 203:
Table A.1.1 continued Incidence, di
Page 204 and 205:
Page 206 and 207:
Page 208 and 209:
Page 210 and 211:
Page 212 and 213:
Page 214 and 215:
Page 216 and 217:
Annex 5: Incidence, distribution an
Page 218 and 219:
Annex 6: Incidence, distribution an
Page 220 and 221:
Page 222 and 223:
Page 224 and 225:
Page 226 and 227:
Page 228 and 229:
Page 230 and 231:
Page 232:
Books Incidence, distribution and c
show all

Incidence, Distribution and Characteristics of Major Tomato Leaf ...

Create successful ePaper yourself

Delete template?

Save as template?