| single-strand-conformation polymorphism of ribosomal dna for rapid species differentiation in genus phytophthora. | single-strand-conformation polymorphism (sscp) of ribosomal dna of 29 species (282 isolates) of phytophthora was characterized in this study. phytophthora boehmeriae, phytophthora botryosa, phytophthora cactorum, phytophthora cambivora, phytophthora capsici, phytophthora cinnamomi, phytophthora colocasiae, phytophthora fragariae, phytophthora heveae, phytophthora hibernalis, phytophthora ilicis, phytophthora infestans, phytophthora katsurae, phytophthora lateralis, phytophthora meadii, phytophth ... | 2003 | 12892637 |
| identification of qtls related to cocoa resistance to three species of phytophthora. | this study aimed to compare the genetic control of cacao resistance to three species of phytophthora: phytophthora palmivora, phytophthora megakarya and phytophthora capsici. the study was conducted on 151 hybrid progenies created in côte d'ivoire and grown in a green-house in montpellier. phytophthora resistance was screened by leaf-test inoculation with two different strains per species. selection of the best individuals for resistance to p. palmivora at a 10% selection rate, would lead to a g ... | 2003 | 13679987 |
| potassium homeostasis influences the locomotion and encystment of zoospores of plant pathogenic oomycetes. | zoospores of plant pathogenic oomycetes exhibit distinct swimming speeds and patterns under natural conditions. zoospore swimming is influenced by ion homeostasis and changes in the ionic composition of media. therefore, we used video microscopy to investigate swimming patterns of five oomycete species in response to changes in potassium homeostasis. in general, zoospore speed tended to be negatively correlated with zoospore size. three phytophthora species (phytophthora palmivora, phytophthora ... | 2005 | 15707842 |
| developmental expression of stress response genes in theobroma cacao leaves and their response to nep1 treatment and a compatible infection by phytophthora megakarya. | developmental expression of stress response genes in theobroma cacao leaves and their response to nep1 and a compatible infection by phytophthora megakarya were studied. ten genes were selected to represent genes involved in defense (tccaf-1, tcglu1,3, tcchib, tccou-1, and tcper-1), gene regulation (tcwrky-1 and tcorfx-1), cell wall development (tccou-1, tcper-1, and tcglu-1), or energy production (tclhca-1 and tcrbcs). leaf development was separated into unexpanded (ue), young red (yr), immatur ... | 2005 | 15979314 |
| nep1 orthologs encoding necrosis and ethylene inducing proteins exist as a multigene family in phytophthora megakarya, causal agent of black pod disease on cacao. | phvytophthora megakarya is a devastating oomycete pathogen that causes black pod disease in cacao. phytophthora species produce a protein that has a similar sequence to the necrosis and ethylene inducing protein (nep1) of fusarium oxysporum. multiple copies of nep1 orthologs (pmegnep) have been identified in p. megakarya and four other phytophthora species (p. citrophthora, p. capsici, p. palmivora, and p. sojae). genome database searches confirmed the existence of multiple copies of nep1 orthol ... | 2005 | 16353637 |
| response surface methodology study of the combined effects of temperature, ph, and aw on the growth rate of trichoderma asperellum. | to evaluate the influence of environmental parameters (water activity aw, temperature, and ph) on the radial growth rate of trichoderma asperellum (strains pr10, pr11, pr12, and 659-7), an antagonist of phytophthora megakarya, the causal agent of cocoa black pod disease. | 2007 | 17897186 |
| the drought response of theobroma cacao (cacao) and the regulation of genes involved in polyamine biosynthesis by drought and other stresses. | drought can negatively impact pod production despite the fact that cacao production usually occurs in tropical areas having high rainfall. polyamines (pas) have been associated with the response of plants to drought in addition to their roles in responses to many other stresses. the constitutive and drought inducible expression patterns of genes encoding enzymes involved in pa biosynthesis were determined: an ornithine decarboxylase (tcodc), an arginine decarboxylase (tcadc), an s-adenosylmethio ... | 2008 | 18042394 |
| cacao diseases: important threats to chocolate production worldwide. | abstract theobroma cacao, cacao, is an ancient, neotropical domesticate. it is now grown throughout the humid, lowland tropics and is the basis of a multibillion dollar confectionary trade. diverse diseases impact production of the crop. they reduce yields by ca. 20%, but could cause far greater losses if certain highly damaging diseases were to become more widely distributed. among the most potentially dangerous of these diseases are frosty pod, caused by moniliophthora roreri, and witches' bro ... | 2007 | 18943724 |