Rhythm of zoospore production of pythium on lettuce cultured hydroponically
| dc.contributor.advisor | Stanghellini, Michael E. | en_US |
| dc.contributor.author | Sultan, Youneskhan, 1957- | |
| dc.creator | Sultan, Youneskhan, 1957- | en_US |
| dc.date.accessioned | 2013-03-28T10:13:41Z | en |
| dc.date.available | 2013-03-28T10:13:41Z | en |
| dc.date.issued | 1988 | en_US |
| dc.identifier.uri | http://hdl.handle.net/10150/276687 | en |
| dc.description.abstract | Zoospore production of Pythium dissotocum Drechs. in the nutrient solution of hydroponically-grown lettuce, in the greenhouse, was shown to be cyclic. The number of zoospores detected in the nutrient solution was lowest around noontime, (11:00-14:00 hr) and highest around 20:00 hr. Growth chamber studies were conducted to determine the effect of different light periods on zoospore production. Under continuous light or continuous darkness, the population of zoospores in the nutrient solution decreased. But under 12 hours light, and 12 hours darkness or two periods of light each for 3 hours, zoospore populations decreased during the light period but increased during the dark period. | |
| dc.language.iso | en_US | en_US |
| dc.publisher | The University of Arizona. | en_US |
| dc.rights | Copyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author. | en_US |
| dc.subject | Lettuce -- Diseases and pests. | en_US |
| dc.subject | Pythium. | en_US |
| dc.subject | Hydroponics. | en_US |
| dc.title | Rhythm of zoospore production of pythium on lettuce cultured hydroponically | en_US |
| dc.type | text | en_US |
| dc.type | Thesis-Reproduction (electronic) | en_US |
| dc.identifier.oclc | 20441687 | en_US |
| thesis.degree.grantor | University of Arizona | en_US |
| thesis.degree.level | masters | en_US |
| dc.identifier.proquest | 1333264 | en_US |
| thesis.degree.discipline | Graduate College | en_US |
| thesis.degree.discipline | Plant Pathology | en_US |
| thesis.degree.name | M.S. | en_US |
| dc.identifier.bibrecord | .b17006831 | en_US |
| refterms.dateFOA | 2018-06-19T01:59:42Z | |
| html.description.abstract | Zoospore production of Pythium dissotocum Drechs. in the nutrient solution of hydroponically-grown lettuce, in the greenhouse, was shown to be cyclic. The number of zoospores detected in the nutrient solution was lowest around noontime, (11:00-14:00 hr) and highest around 20:00 hr. Growth chamber studies were conducted to determine the effect of different light periods on zoospore production. Under continuous light or continuous darkness, the population of zoospores in the nutrient solution decreased. But under 12 hours light, and 12 hours darkness or two periods of light each for 3 hours, zoospore populations decreased during the light period but increased during the dark period. |
