Written in English
|Statement||by Philip B. Hamm.|
|The Physical Object|
|Pagination|| 96 leaves, bound :|
|Number of Pages||96|
Morphological Differentiation of Host-Specialized Groups of Phytophthora megasperma E. M. Hansen and P. B. Hamm Associate professor and research assistant, respectively, Department of Botany and Plant Pathology, Oregon State University, Cowallis VIEW ARTICLE. Etiology Morphology, Pathogenicity, and Host Range of Phytophthora megasperma, P. erythroseptica, and P. parasitica from Arrowleaf Clover. R. G. Pratt, Research plant pathologist, U. S. Department of Agriculture, Science and Education Administration, Agricultural Research, Crop Science and Engineering Research Laboratory, Forage Research Unit, and Department of Plant Pathology. Considerable tree losses have been observed during the past few years in Spain due to Phytophthora branch canker of clementines caused by Phytophthora citrophthora. The emergence of this disease led to the speculation that either the pathogen has evolved increasing its aggressiveness or specificity to clementines. A total of isolates of P. citrophthora collected from to in Cited by: 9. PreViously, the large oogonial isolates had also been differentiated by their protein pattern, growth Molecular taxonomy of Phytophthora megasperma Table 3. Similarity matrix within and between mtDNA groups of P. megasperma and P. drechsleri (P) and P. cryptogea (PO and P). Refer to Table 1 for isolates corresponding to each mtDNA by:
The relatedness between four Phytophthora megasperma isolates [P. megasperma f. sp. glycinea (Pmg) from soybean, P. megasperma f. sp. medicaginis (Pmm) from alfalfa, and two broad host-range. Downes MJ; Loughnane JB, New or uncommon plant diseases and pests. Phytophthora megasperma Drechsl. on broccoli and swede in the Republic of Ireland. Plant Pathology, Drechsler C, A crown rot of hollyhocks caused by Phytophthora megasperma n. sp. Journal Washington Academy Science, Erwin DC; Ribeiro OK, Abstract. Citrus, an important cash crop in India, is adversely affected by Phytophthora nicotianae, P. palmivora, and P. hthora insolita is known to be associated with citrus and reported for the first time in India. It is a rare and poorly characterized Phytophthora species, as its natural host and pathogenic impact are unclear.. Previously, it was reported only in Taiwan Cited by: 3. NOTE: Morphological variation gives rise to continuous variation in which a given feature or features show(s) gradual transition between two extremes. This type of variation is regarded as continuous variation. In other words, it is continuous and does not have a sharp difference between one morphological feature and the other.
P. megasperma, P. [nicotianae var.] parasitica and a sp. provisionally identified as P. erythroseptica were isolated from Trifolium vesiculosum plants with symptoms of root rot in Miss. P. erythroseptica was also isolated from hop clover (T. agrarium) and P. megasperma from a cruciferous weed. Problems in identification of isolates and the validity of taxonomic criteria are by: The clade currently consists of three officially described species (Phytophthora porri, P. brassicae and P. primulae) that are host-specific pathogens of leek, cabbages and Primula spp., : H. H. Ho. When 93 isolates were compared, including many described by others, for classical morphological features, growth behaviour and appearance, electrophoretic pattern of total proteins, chromosome number and nuclear DNA content, 9 distinct sub-groups were distinguished. While most groups could be distinguished by each of the criteria, protein electrophoresis was the most by: Buzzell, R.I. and Anderson, T.R. , Plant loss response of soyabean cultivars to Phytophthora megasperma f. sp. glycinea under Morphological and host range studies on Melampsora rust’s attacking Salix species in New Zealand Gupta R., Mukerji K.G. () Host Parasite Specificity and Pathogenesis. In: Mukerji K.G., Chamola B.P Cited by: 1.