Temporal and spatial distribution patterns of collar and papillae wall appositions in resistant and susceptible tuber tissue of Solanum tuberosum infected by Phytophthora infestans

1984 ◽  
Vol 24 (1) ◽  
pp. 107-118 ◽  
Author(s):  
H. Hächler ◽  
H.R. Hohl
Keyword(s):  
Spatial Distribution ◽  
Solanum Tuberosum ◽  
Phytophthora Infestans ◽  
Distribution Patterns ◽  
Tuber Tissue ◽  
Temporal And Spatial Distribution ◽  
Spatial Distribution Patterns ◽  
Wall Appositions ◽  
Temporal And Spatial

Temporal distribution, localization and metabolism of all-trans-retinol, didehydroretinol and all-trans-retinal during Xenopus development

1994 ◽  
Vol 301 (1) ◽  
pp. 111-119 ◽  
Author(s):  
J Creech Kraft ◽  
T Schuh ◽  
M R Juchau ◽  
D Kimelman
Keyword(s):  
Spatial Distribution ◽  
Retinoic Acid ◽  
Distribution Patterns ◽  
Retinoid Receptor ◽  
Temporal And Spatial Distribution ◽  
Spatial Distribution Patterns ◽  
Xenopus Embryos ◽  
Trans Retinoic Acid ◽  
All Trans Retinoic Acid ◽  
Temporal And Spatial

Recently, the temporal and spatial distribution patterns of the retinoid receptor ligands 9-cis-retinoic acid and all-trans-retinoic acid were described in Xenopus embryos during early development [Creech Kraft, Schuh, Juchau and Kimelman (1994) Proc. Natl. Acad. Sci. U.S.A., in the press]. The present study demonstrates the presence and distribution of their likely precursors, all-trans-retinol, didehydroretinol, didehydroretinal and all-trans-retinal, as well as the occurrence of 4-oxo metabolites, in Xenopus embryos. The temporal and spatial distribution patterns of all-trans-retinol, didehydroretinol and all-trans-retinal did not coincide with that observed for 9-cis-retinoic acid but, in certain regards, were similar to the patterns delineated for all-trans-retinoic acid and all-trans-retinoyl beta-glucuronide. Evidence is presented that 9-cis-retinoic acid can be synthesized from both all-trans-retinoic acid and all-trans-retinol in Xenopus embryos, suggesting that the difference between the distributions of 9-cis-retinoic acid and the other retinoids may be caused by selective synthesis and/or protein binding of the 9-cis isomer.

Host–parasite interfaces in a resistant and a susceptible cultivar of Solanum tuberosum inoculated with Phytophthora infestans: tuber tissue

1976 ◽  
Vol 54 (9) ◽  
pp. 900-912 ◽  
Author(s):  
Hans R. Hohl ◽  
Peter Stössel
Keyword(s):  
Solanum Tuberosum ◽  
Phytophthora Infestans ◽  
Susceptible Cultivar ◽  
Potato Tubers ◽  
Tuber Tissue ◽  
Susceptible Host ◽  
Transmission Electron ◽  
Wall Appositions ◽  
Host Parasite ◽  
Extrahaustorial Matrix

Host–parasite interfaces in potato tubers (Solanum tuberosum) of a resistant (Eba) and a susceptible (Bintje) cultivar inoculated with Phytophthora infestans were studied with transmission electron microscopy. In the resistant host the fungal haustoria are typically small and surrounded by an electron-dense extrahaustorial matrix and electron-transparent wall appositions, normally in form of complete encasements. Wall appositions are generally lacking in the susceptible host or occasionally are found as a collar at the base of the rather large haustorium, which is surround by a well developed extrahaustorial matrix. Since wall appositions probably contain largely a callose-like material, potential roles of fungal glucanases in this host–parasite system are discussed.

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