Studies in the genus Phytophthora de Bary

Morgan, Elisabeth Irene Love (1968) Studies in the genus Phytophthora de Bary. MSc(R) thesis, University of Glasgow.

Abstract

The order Peronosporales includes many important plant pathogens. The most notable of these belong to the genera Phytophthora, Pythium and Plasmopara. Each year in both temperate and tropical zones species of these genera cause considerable damage to crops. Despite their obvious economic importance very little is knovm of the biology of these fungi. Mechanisms controlling variation are unknown. Factors controlling sexuality and its inheritance have yet to be determined. The place of meiosis in the life cycle and the ploidy of the somatic nucleus are still a matter of controversy. Cytological methods have been used to investigate the stage at which meiosis occurs as a means of determining the ploidy of the somatic nucleus. This will be haploid if meiosis occurs in the oospore, or will be diploid if meiosis occurs in the developing gametangia prior to fertilisation. Evidence supporting both haplontic and diplontic types of life cycle has been presented. Meiotic figures in the germinating oospores have been reported in Sclerospora graminicola (McDonough, 1937), Plasmopara viticola (Bose, 1947) and Albugo evolvuli (Thirumalachar et al, 1949). Sansome working with Pythium debaryanum, Sclerospora sorghi, Phytophthora erythroseptica, P. cactorum and Achlya sp. (1961, 1963, 1965),

• Item Type: Thesis (MSc(R))
• Qualification Level: Masters
• Keywords: Plant pathology
• Date of Award: 1968
• Depositing User: Enlighten Team
• Unique ID: glathesis:1968-73801
• Copyright: Copyright of this thesis is held by the author.
• Date Deposited: 14 Jun 2019 08:56
• Last Modified: 14 Jun 2019 08:56
• URI: https://theses.gla.ac.uk/id/eprint/73801