Cytological studies on the infection of barley cultivars with known resistance genotypes by Rhynchosporium secalis

1990 ◽  
Vol 68 (9) ◽  
pp. 1953-1961 ◽  
Author(s):  
H. Lehnackers ◽  
W. Knogge
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Spore Germination ◽  
Leaf Surface ◽  
Rhynchosporium Secalis ◽  
Susceptible Cultivar ◽  
Infection Cycle ◽  
Fungal Development ◽  
Barley Cultivars ◽  
Scanning Electron

Seven races of Rhynchosporium secalis were screened for their virulence on a variety of barley cultivars. Four races were identified as virulent on cultivar Atlas 46 (resistance loci Rrs1 and Rrs2) but virulent on the near-isogenic cultivar Atlas (Rrs2). For one of these races, US238.1, the fungal infection cycle was followed on the susceptible cultivar by means of light and scanning electron microscopy. From a comparative analysis of fungal development on the susceptible and resistant cultivars, two lines of plant defense emerged: (i) inhibition of spore germination on the leaf surface and (ii) prevention of the establishment of the subcuticular stroma. Investigations of the development of race US238.1 on different barley cultivars with and without Rrs1 and on F1 individuals from different crosses excluded involvement of Rrs1 in the inhibition of spore germination. Possible pathogenicity mechanisms are discussed. Key words: leaf scald, microscopy, plant resistance.

scholarly journals Foliar epidermis morphology in Quercus (subgenus Quercus, section Quercus) in Iran

2012 ◽  
Vol 71 (1) ◽  
pp. 95-113 ◽  
Author(s):  
Parisa Panahi ◽  
Ziba Jamzad ◽  
Mohammad Pourmajidian ◽  
Asghar Fallah ◽  
Mehdi Pourhashemi
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Statistical Analysis ◽  
Leaf Surface ◽  
Epicuticular Waxes ◽  
Abaxial Leaf Surface ◽  
Trichome Types ◽  
Foliar Morphology ◽  
Scanning Electron ◽  
Foliar Epidermis

Foliar epidermis morphology inQuercus(subgenusQuercus, sectionQuercus) in IranThe foliar morphology of trichomes, epicuticular waxes and stomata inQuercus cedrorum, Q. infectoriasubsp.boissieri, Q. komarovii, Q. longipes, Q. macranthera, Q. petraeasubsp.ibericaandQ. robursubsp.pedunculiflorawere studied by scanning electron microscopy. The trichomes are mainly present on abaxial leaf surface in most species, but rarely they appear on adaxial surface. Five trichome types are identified as simple uniseriate, bulbous, solitary, fasciculate and stellate. The stomata of all studied species are of the anomocytic type, raised on the epidermis. The stomata rim may or may not be covered with epicuticular. The epicuticular waxes are mostly of the crystalloid type but smooth layer wax is observed inQ. robursubsp.pedunculiflora.Statistical analysis revealed foliar micromorphological features as been diagnostic characters inQuercus.

Contribution à l'étude du Bayoud, fosariose du palmier-dattier. I. Étude du cultivar sensible Deglet-Nour

1990 ◽  
Vol 68 (10) ◽  
pp. 2054-2058 ◽  
Author(s):  
Béatrice Mathéron ◽  
Abdellatif Benbadis
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Fusarium Oxysporum ◽  
Spore Germination ◽  
Date Palm ◽  
Wilt Disease ◽  
Root Epidermis ◽  
Bordered Pits ◽  
Early Reaction ◽  
Scanning Electron

Date palm seedlings were inoculated at the two-leaf stage with Fusarium oxysporum f. sp. albedinis, the causal agent of Bayoud. Following spore germination, hyphae bore a bole through the walls of the root epidermis and penetrated into the cortical parenchyma. The fungus then grows inter- or intra-cellularly towards the central cylinder and enters the xylem vessels. There, it continues to grow towards the leaves. The progression from vessel to vessel is achieved through bordered pits. The cultivar Deglet-Nour, known for its susceptibility to this wilt disease, exhibited no early reaction to the presence of the parasite in its tissues. Key words: date palm, Fusarium oxysporum f. sp. albedinis, scanning electron microscopy.

Increased Ovipositional Attractancy to Surfactant-Treated Broccoli by the Diamondback Moth (Lepidoptera: Plutellidae): Tests of Potential Mechanisms

1998 ◽  
Vol 33 (3) ◽  
pp. 261-269 ◽  
Author(s):  
Toni M. Riggin-Bucci ◽  
Fred Gould ◽  
Cynthia White
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Visual Cues ◽  
Leaf Surface ◽  
Diamondback Moth ◽  
Complete Darkness ◽  
Choice Tests ◽  
Dramatic Difference ◽  
Plant Wax ◽  
Scanning Electron

Studies were conducted to investigate potential mechanisms by which treatment of broccoli leaves with the surfactant Latron CS-7® causes increased diamondback moth, Plutella xylostella (L.), oviposition. The importance of vision on oviposition was investigated by use of choice and no-choice tests conducted in the presence of light and in complete darkness. Females oviposited 10.7 and 12.8 times as many eggs on treated plants relative to nontreated plants in the presence and absence of light, respectively, indicating that females do not prefer treated plants based solely on visual cues. Greenhouse studies showed that moths continue to lay significantly more eggs on surfactant-treated plants up to 3 d after initial treatment of plants with Latron CS-7. No difference was observed in larval development or survival on treated versus nontreated plants. Scanning electron microscopy indicated a dramatic difference in wax crystallite morphology of surfactant-treated plants relative to nontreated plants. Ovipositional attractancy of surfactant-treated leaves to diamondback moths could be due to a change in mechanoreceptor cues on the leaf surface or volatile compounds released from the leaf surface as a result of altered plant wax micromorphology.

scholarly journals Micromorphology and anatomy of three Symphytum (Boraginaceae) taxa from Turkey

1970 ◽  
Vol 36 (2) ◽  
pp. 93-103 ◽  
Author(s):  
Oznur Ergen Akcin ◽  
Hilal Baki
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Key Words ◽  
Leaf Surface ◽  
Glandular Trichomes ◽  
Epidermal Cells ◽  
Lower Epidermis ◽  
Micromorphology And Anatomy ◽  
Scanning Electron

Symphytum asperum Lepechin, S. ibericum Steven and S. sylvaticum Boiss. were examined morphologically, micromorphologically and anatomically. Scanning electron microscopy was used to examine leaf surface and trichomes of these species. These species had bifacial and hypostomatous leaf types. Epidermal cells of leaves were usually polygonal or irregular in form. The pattern of anticlinical cells may vary in different species and between the upper and lower epidermis of the same species. Stomata are anisocytic and anomocytic in three species. Stomata index is 27.5 for S. sylvaticum, 24.65 for S. ibericum and 21.86 for S. asperum glandular trichomes are capitate in forms and more dense on the lower epidermis than upper epidermis. Eglandular trichomes are simple, short or long, unicellular or multicellular and thin or thick. Key words: Micromorphology, Anatomy, Symphytum DOI = 10.3329/bjb.v36i2.1496 Bangladesh J. Bot. 36(2): 93-103, 2007 (December)   

scholarly journals Scanning Electron Microscopy of Spore Germination in Dictyostelium discoideum

1972 ◽  
Vol 112 (3) ◽  
pp. 1383-1386 ◽  
Author(s):  
R. P. George ◽  
R. M. Albrecht ◽  
K. B. Raper ◽  
I. B. Sachs ◽  
A. P. MacKenzie
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Dictyostelium Discoideum ◽  
Spore Germination ◽  
Scanning Electron
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