Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 15 of 15 for “"Sporangia"”.
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A biological study of Desmarestia firma (C.Ag.) Skottsb. (Phaeophyceae, Desmarestiales)
… from culture. Zoospores from unilocular sporangia give rise to separate filamentous male and female gametophytes. Male gametophytes bear flask-shaped antheridia, each containing a single antherozooid. Female gametophytes bear club-shaped oogonia, each producing one or perhaps more eggs. …
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New Species and Phylogeny of the Genus Phytophthora
… a mix of non-papillate and semi-papillate sporangia, and catenulate hyphal swellings. It is a heterothallic species. All examined isolates of P. mississippiae are A1. When paired with A2 mating type testers, P. mississippiae produces ornamented oogonia and amphigynous antheridia. It is …
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STUDIES ON A CALCIUM-DEPENDENT ACTIVATOR PROTEIN, STRUCTURALLY AND FUNCTIONALLY HOMOLOGOUS TO CALMODULIN, FROM THE WATER MOLD ACHLYA AMBISEXUALIS RAPER.
… asexually CaM becomes concentrated in the sporangial apices. After spore release bands of CaM persist around the exit pores of sporangia and cysts of Achlya and other members of the Saprolegniaceae studied. Calcofluor pulse-chase experiments indicate that sporangiogenesis involves a …
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Diagnostics and epidemiology of <i>Phytophthora infestans</i> : the cause of late blight of potato
… pair can also detect as few as two oospores, two sporangia and four zoospores of <i>P. infestans</i>. Using primer pair INF FW2 and INF REV, ten oospores of <i>P. infestans</i> could be detected in 0.5 g soil, besides detecting the pathogen in symptomatic and symptomless leaves, stems and tubers. …
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Optimizing in-vitro production of Delaware-isolated Pythium zoospores
… various ecological niches by producing oospores, sporangia, and mycelial hyphae. However, infections on host tissue are primarily initiated by specialized, motile, asexual structures known as zoospores released from sporangia. Research focused on Pythium-plant interactions is advanced by …
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Morphological study of Schizaea Pectinata (L.) Sw. (Schizaeaceae)
… structure and consequently spore, stoma and sporangia sizes, as well as the number per lamina was studied to determine if the species can be subdivided into two groups, e summer and e winter rainfall group, as was previously hypothesised. Univariate and bivariate methods were used to display …
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Effectiveness of mustard short-cycle cover crops for management of Phytophthora capsici and Fusarium spp. in cucurbits
… were tested for inhibition of colony growth, sporangia production, zoospore germination, and oospore germination of four P. capsici isolates (PC-1, PC-2, PC-3, and PC-4). In addition, the mustard extracts were tested for inhibition of colony growth of F. oxysporum (F-2 and F-3) and F. solani …
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Lipid Biosynthesis and Maturation Signals in Batrachochytrium Dendrobatidis In Vitro
… developmental regulators secreted by zoosporangia that quicken the development of conspecifics. In addition, the isolation of proteins responsible for host-invasion was attempted using SDS-PAGE. Results from maturation assays support that multiple secretory molecules work synergistically …
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Evaluation of Downy Mildew (Peronospora farinosa f.sp. chenopodii) Resistance among Quinoa Genotypes and Investigation of P. farinosa Growth using Scanning Electron Microscopy
… secreted extracellular matrices during sporangia germination, grew intercellularly in leaf and petiole tissues, and exited leaf tissue through stomata. Future research requiring knowledge of resistant quinoa genotypes, P. farinosa growth and development, or inoculation methods for large …
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Discovery and characterisation of viral-like sequences and viruses associated with Phytophthora pluvialis in New Zealand
… isolates produced more aerial hyphae, sporangia, and hyphal swellings compared to PplRV1-cured isolates. To differentiate PplRV1 and P. pluvialis genotypes, a diagnostic method using high-resolution melting (HRM) analysis was developed and used to track horizontal transmission of PplRV1 …
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Analysis of symptom expressions and transmission rates caused by the plant pathogen Phytophthora ramorum on native chaparral plants from the genus Arctostaphylos
… vicinity of the diseased Bay Laurel. No sporangia were detected in the air and symptoms of ramorum blight were not expressed on the manzanitas. Although field experiments did not detect <em>P. ramorum</em> on the <em>Arctostaphylos</em> <em>spp</em>., in the growth chamber experiments all …
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Genetic diversity and pathogenicity of pea downy mildew (Peronospora viciae f. sp. pisi) in New Zealand : A thesis submitted in partial fulfilment of the requirements for the Degree of Master of Applied Science at Lincoln University
… environment. Infection was achieved using fresh sporangia and soil collected from sites with a known history of hosting Pvp infected plants. No infection was achieved with dehydrated, infected field pods. Only two plants expressed signs of Pvp infection, thus no discernable laboratory conditions …
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The Animal-fungi Hybrid Cell Cycle of the Zoosporic Fungus Spizellomyces punctatus - a New Model to Understand Evolution of Eukaryotic Cell Cycle Control
… much like amoeba or animal cells, and that sporangia rely on complex actin dynamics during the formation of zoospores that are reminiscent of animal cellularization processes. This work highlights the importance of non-model systems for finding new solutions to longstanding questions in …
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Genome editing for engineering resilience to climate changes in grapevine
… in grapevine leaves. Moreover, evaluating sporangia density in inoculated leaf tissues, no significant differences were observed among genotypes in three different experiments. Our observation conducted on leaf discs explants suggest that stomatal density may not play a major role in …