Suppression of Phenylalanine Ammonia-Lyase mRNA Accumulation by Suppressors from Phytophthora infestans.

1995 ◽  
Vol 61 (1) ◽  
pp. 7-12 ◽  
Author(s):  
Hirofumi YOSHIOKA ◽  
Yukie HAYAKAWA ◽  
Noriyuki DOKE
Keyword(s):  
Phytophthora Infestans ◽  
Phenylalanine Ammonia Lyase ◽  
Mrna Accumulation

scholarly journals Transient Induction of Phenylalanine Ammonia-Lyase and 4-Coumarate: CoA Ligase mRNAs in Potato Leaves Infected with Virulent or Avirulent Races of Phytophthora infestans

1987 ◽  
Vol 85 (1) ◽  
pp. 34-41 ◽  
Author(s):  
Karl-Heinrich Fritzemeier ◽  
Claude Cretin ◽  
Erich Kombrink ◽  
Frauke Rohwer ◽  
Janet Taylor ◽  
...  
Keyword(s):  
Phytophthora Infestans ◽  
Phenylalanine Ammonia Lyase ◽  
Coa Ligase

scholarly journals Novel Protein Kinase Induced during Sporangial Cleavage in the Oomycete Phytophthora infestans

2002 ◽  
Vol 1 (5) ◽  
pp. 687-695 ◽  
Author(s):  
Howard S. Judelson ◽  
Samuel Roberts
Keyword(s):  
Protein Kinase ◽  
Phytophthora Infestans ◽  
Protein Kinases ◽  
Kinase Inhibitors ◽  
De Novo ◽  
Protein Kinase Inhibitors ◽  
Kinase Gene ◽  
Mrna Accumulation ◽  
Calmodulin Antagonist ◽  
Zoospore Release

ABSTRACT A study of the effect of inhibitors on zoospore development in Phytophthora infestans demonstrated the involvement of protein kinases and calcium and led to the discovery of a gene induced during zoosporogenesis that encoded a protein resembling Ca+2- and calmodulin-regulated serine/threonine protein kinases. The calcium channel blocker verapamil and the calmodulin antagonist trifluoroperazine inhibited zoosporogenesis and encystment. The protein kinase inhibitors K-252a and KN-93 inhibited zoospore release, encystment, and cyst germination, and K-252a reduced zoospore viability. In contrast, the inhibitors had minor or no effects on sporangia directly germinating in media. Spurred by these findings, a survey of putative protein kinase genes was performed to identify any that were up-regulated during zoosporogenesis. A kinase-encoding gene was identified for which mRNA accumulation was first detected soon after chilling sporangia in water, conditions that induce sporangial cytoplasm to cleave and release zoospores. The transcript persisted in motile zoospores and in germinated cysts but was not detected in other tissues, including hyphae, hyphae placed in water, or directly germinating sporangia. The structure of the predicted protein was novel, as its C-terminal region, which binds calmodulin in related proteins, was unusually short. Concentrations of actinomycin D previously used in experiments that suggested that de novo transcription was not needed for zoosporogenesis or encystment only partially inhibited transcription of the kinase gene, probably due to poor uptake into sporangia.

Differential Responses of Potato Cell Suspensions to a Culture Filtrate of Phytophthora infestans

1997 ◽  
Vol 52 (5-6) ◽  
pp. 333-338 ◽  
Author(s):  
M. F. M. Awan ◽  
U. Maciejewska ◽  
K. Kleczkowski ◽  
B. Wielgat
Keyword(s):  
Phytophthora Infestans ◽  
Culture Filtrate ◽  
Phenylalanine Ammonia Lyase ◽  
Solanum Tuberosum L ◽  
Defense Responses ◽  
Cell Suspensions ◽  
Plant Defense Responses ◽  
Polygenic Resistance ◽  
Pal Activity ◽  
Potato Cell

Abstract General (polygenic) resistance of plant hosts to an attack by a range of pathogens is an important feature of plant defense responses against the infection. In search of biochemical markers defining this resistance, cell suspensions derived from leaves of potato (Solanum tuberosum L .) cvs. Tarpan and Bzura that are polygenically susceptible and resistant to Phytophthora infestans, respectively, were inoculated with culture filtrate (CF) of the fungus. Cell suspension of Tarpan responded to CF treatment by a higher extracellular alkalinization and more significant reduction in their viability and growth than those of the Bzura cultivar. The stimulation of phenylalanine ammonia-lyase (PAL ) activity but not of β-1,3-glucanase, was significantly higher in CF treated Bzura cells than in Tarpan ones. The obtained results suggest that sensitivity to the fungal toxins and variation of PAL activity may represent useful markers for the evaluation of polygenic resistance in potato.

Recent data on the causative agent of pale green dwarf (Acholeplasma laidlawii var. granulum incertae sedis) in Ukraine: pathogenicityand virulence factors and host reactions

2015 ◽  
Vol 2 (1) ◽  
pp. 30-34
Author(s):  
K. Korobkova ◽  
V. Patyka
Keyword(s):  
Phenylalanine Ammonia Lyase ◽  
Proteolytic Enzymes ◽  
Physiological State ◽  
Plant Cells ◽  
Temporary Increase ◽  
Adhesive Properties ◽  
The Impact ◽  
Signaling Interactions ◽  
Pale Green

Contemporary state of the distribution of mycoplasma diseases of cultivated crops in Ukraine was analyzed. The changes of the physiological state of plant cells under the impact of mollicutes were investigated. It was demonstrated that there is temporary increase in the activity of peroxidase, catalase, polyphenoloxidase, phenylalanine-ammonia-lyase at the early stages of interaction. The adhesive properties are changed in the mollicutes under the impact of plant lectin; there is synthesis of new polypeptides. It was determined that the phytopathogenic acholeplasma is capable of producing a complex of proteolytic enzymes into the culture me- dium. It was concluded that when plant cells are infected with acholeplasma, a number of signaling interactions and metabolic transformations condition the recognition of pathogenesis and ensure the aggregate response of a plant to stress in the form of defense reactions. It was assumed that some specifi cities of the biology of phy- topathogenic acholeplasma determine their avoiding the immune mechanisms of plants and promote long-term persistence of mollicutes.

Sign in / Sign up

Export Citation Format

Share Document