Post harvest diseases fruits and vegetables - Xavier University ...

More documents

Recommendations

Info

FREEDOM PALESTINE FREEDOM PALESTINE FREEDOM PALESTINE Host Protection and Defense Mechanisms 89 10 20 30 Days after curing Fig. 16. Effect of 72 h curing at various temperatures on percent decay of inoculated pummelo held at 11° and 17°C. (Reproduced from Ben-Yehoshua et al, 1988). 8 12 16 20 24 Days after curing Fig. 17. Effect of duration of the curing period at 36°C on percent decay of inoculated pummelo at 17°C. (Reproduced from Ben-Yehoshua et al. 1988). http://arab2000.forumpro.fr
FREEDOM PALESTINE FREEDOM PALESTINE FREEDOM PALESTINE 90 Postharvest Diseases of Fruits and Vegetables directly with the inducement of these compounds at the wound site. It was further found that dipping the fruits in the non-toxic compound, potassium phosphonate, increased the resistance of the wound to P. digitatum infection (Wild, 1993). This was only noticeable when at least 24 h was allowed between dipping the freshly wounded fruits and inoculating them with Penicillium spores. Since this compound has no direct effect on Penicillium growth in vitro, it was concluded that the potassium phosphonate was eliciting enhanced production of these antifungal compounds in the host, and this conclusion was further supported by the finding that cycloheximide, which is a protein synthesis inhibitor, negated the effect of the phosphonate (Wild, 1993). Studies with young apricot fruits indicated that the mechanical barrier formed in response to fungal penetration may also prevent reactivation of a quiescent infection. The cell-wall suberization of living cells surrounding the infection point of Monilinia fructicola in the young fruit and the accompanying accumulation of phenolic compounds, have been hypothesized to be the reason for the non-activation of the quiescent fungus growth (Wade and Cruickshank, 1992). When the fruit ripens, however, viable hyphae of M fructicola may escape from the arrested lesions and cause fruit decay. Curing effects and decreased incidence of Botrytis cinerea can be obtained in kiwifruit by prolonging the time between harvesting and cool storage (Pennycook and Manning, 1992). In determining the critical conditions required during curing of kiwifruit in order to minimize Botrytis rot during storage, Bautista-Bafios et al. (1997) concluded that temperatures between 10 and 20°C, together with relative humidity (RH) higher than 92% for a three-day curing period, should provide adequate disease control without lowering fruit quality during cold storage (0°C); increased temperature or decreased RH generally resulted in increased fruit weight loss. F. ACTIVE OXYGEN Active oxygen, produced by plant cells during interactions with potential pathogens and in response to elicitors, has recently been suggested to be involved in pathogenesis. "Active oxygen species", including superoxide, hydrogen peroxide and hydroxyl radical, can affect many cellular processes involved in plant-pathogen interactions (Baker and Orlandi, 1995). The direct antimicrobial effect of active oxygen http://arab2000.forumpro.fr
Page 1 and 2:
FREEDOM PALESTINE FREEDOM PALESTINE
Page 3 and 4:
Page 5 and 6:
Page 7 and 8:
Page 9 and 10:
Page 11 and 12:
Page 13 and 14:
Page 15 and 16:
Page 17 and 18:
Page 19 and 20:
Page 21 and 22:
Page 23 and 24:
Page 25 and 26:
Page 27 and 28:
Page 29 and 30:
Page 31 and 32:
Page 33 and 34:
Page 35 and 36:
Page 37 and 38:
Page 39 and 40:
Page 41 and 42:
Page 43 and 44:
Page 45 and 46:
Page 47 and 48:
Page 49 and 50:
Page 51 and 52: FREEDOM PALESTINE FREEDOM PALESTINE
Page 101: FREEDOM PALESTINE FREEDOM PALESTINE
Page 153 and 154:
Page 155 and 156:
Page 157 and 158:
Page 159 and 160:
Page 161 and 162:
Page 163 and 164:
Page 165 and 166:
Page 167 and 168:
Page 169 and 170:
Page 171 and 172:
Page 173 and 174:
Page 175 and 176:
Page 177 and 178:
Page 179 and 180:
Page 181 and 182:
Page 183 and 184:
Page 185 and 186:
Page 187 and 188:
Page 189 and 190:
Page 191 and 192:
Page 193 and 194:
Page 195 and 196:
Page 197 and 198:
Page 199 and 200:
Page 201 and 202:
Page 203 and 204:
Page 205 and 206:
Page 207 and 208:
Page 209 and 210:
Page 211 and 212:
Page 213 and 214:
Page 215 and 216:
Page 217 and 218:
Page 219 and 220:
Page 221 and 222:
Page 223 and 224:
Page 225 and 226:
Page 227 and 228:
Page 229 and 230:
Page 231 and 232:
Page 233 and 234:
Page 235 and 236:
Page 237 and 238:
Page 239 and 240:
Page 241 and 242:
Page 243 and 244:
Page 245 and 246:
Page 247 and 248:
Page 249 and 250:
Page 251 and 252:
Page 253 and 254:
Page 255 and 256:
Page 257 and 258:
Page 259 and 260:
Page 261 and 262:
Page 263 and 264:
Page 265 and 266:
Page 267 and 268:
Page 269 and 270:
Page 271 and 272:
Page 273 and 274:
Page 275 and 276:
Page 277 and 278:
Page 279 and 280:
Page 281 and 282:
Page 283 and 284:
Page 285 and 286:
Page 287 and 288:
Page 289 and 290:
Page 291 and 292:
Page 293 and 294:
Page 295 and 296:
Page 297 and 298:
Page 299 and 300:
Page 301 and 302:
Page 303 and 304:
Page 305 and 306:
Page 307 and 308:
Page 309 and 310:
Page 311 and 312:
Page 313 and 314:
Page 315 and 316:
Page 317 and 318:
Page 319 and 320:
Page 321 and 322:
Page 323 and 324:
Page 325 and 326:
Page 327 and 328:
Page 329 and 330:
Page 331 and 332:
Page 333 and 334:
Page 335 and 336:
Page 337 and 338:
Page 339 and 340:
Page 341 and 342:
Page 343 and 344:
Page 345 and 346:
Page 347 and 348:
Page 349 and 350:
Page 351 and 352:
Page 353 and 354:
Page 355 and 356:
Page 357 and 358:
Page 359 and 360:
Page 361 and 362:
Page 363 and 364:
Page 365 and 366:
Page 367 and 368:
Page 369 and 370:
Page 371 and 372:
Page 373 and 374:
Page 375 and 376:
Page 377 and 378:
Page 379 and 380:
Page 381 and 382:
Page 383 and 384:
Page 385 and 386:
Page 387 and 388:
Page 389 and 390:
Page 391 and 392:
Page 393 and 394:
Page 395 and 396:
Page 397 and 398:
Page 399 and 400:
Page 401 and 402:
Page 403 and 404:
Page 405 and 406:
Page 407 and 408:
Page 409 and 410:
Page 411 and 412:
Page 413 and 414:
Page 415 and 416:
Page 417 and 418:
Page 419 and 420:
Page 421 and 422:
Page 423 and 424:
Page 425 and 426:
Page 427 and 428:
Page 429 and 430:
Page 431:
show all

Post harvest diseases fruits and vegetables - Xavier University ...

You also want an ePaper? Increase the reach of your titles

Delete template?

Save as template?