Distribution of silicon in cucumber leaves during infection by powdery mildew fungus (Sphaerotheca fuliginea)

1991 ◽  
Vol 69 (1) ◽  
pp. 140-146 ◽  
Author(s):  
A. L. Samuels ◽  
A. D. M. Glass ◽  
D. L. Ehret ◽  
J. G. Menzies
Keyword(s):  
Cucumis Sativus ◽  
Fungal Growth ◽  
Sphaerotheca Fuliginea ◽  
Powdery Mildew Fungus ◽  
Hyphal Length ◽  
Cucumis Sativus L ◽  
X Ray ◽  
Host Cell Wall ◽  
Altered Surface ◽  
High Concentrations

The distribution of silicon in the leaf epidermis of cucumber (Cucumis sativus L.) grown in hydroponic nutrient solutions supplemented with soluble silicates was examined using scanning electron microscopy and energy dispersive x-ray analysis. Silicon was found primarily in cells surrounding the bases of the trichome hairs. During infection by Sphaerotheca fuliginea (Schlecht.:Fr.) Poll., areas of host cell wall adjacent to the germinating hyphae showed altered surface morphology and high concentrations of silicon. Measurements of total hyphal length per colony showed the fungal colonies grown on silicate-treated plants were significantly smaller than fungal colonies grown on control plants. In the early stages of infection, the presence of high silicon surrounding colonies was correlated with lower fungal growth. Key words: silicon, x-ray analysis, hydroponics, Cucumis sativus, Sphaerotheca fuliginea.

scholarly journals Comparative transcriptomic analyses of powdery mildew resistant and susceptible cultivated cucumber (Cucumis sativus L.) varieties to identify the genes involved in the resistance to Sphaerotheca fuliginea infection

PeerJ ◽  
2020 ◽  
Vol 8 ◽  
pp. e8250
Author(s):  
Peng Zhang ◽  
Yuqiang Zhu ◽  
Shengjun Zhou
Keyword(s):  
Powdery Mildew ◽  
Cucumis Sativus ◽  
Cell Walls ◽  
Class I ◽  
Hormone Signaling ◽  
Sphaerotheca Fuliginea ◽  
Cucumis Sativus L ◽  
Yield And Quality ◽  
Differential Expressed Genes ◽  
Pathogen Response

Background Cucumber (Cucumis sativus L.) is a widely cultivated vegetable crop, and its yield and quality are greatly affected by various pathogen infections. Sphaerotheca fuliginea is a pathogen that causes powdery mildew (PM) disease in cucumber. However, the genes involved in the resistance to PM in cucumber are largely unknown. Methods In our study, a cucumber PM resistant cultivated variety “BK2” and a susceptible cultivated variety “H136” were used to screen and identify differential expressed genes (DEGs) under the S. fuliginea infection. Results There were only 97 DEGs between BK2 and H136 under the control condition, suggesting a similarity in the basal gene expression between the resistant and susceptible cultivated varieties. A large number of hormone signaling-related DEGs (9.2% of all DEGs) between resistant and susceptible varieties were identified, suggesting an involvement of hormone signaling pathways in the resistance to PM. In our study, the defense-related DEGs belonging to Class I were only induced in susceptible cultivated variety and the defense-related DEGs belonging to Class II were only induced in resistant cultivated variety. The peroxidase, NBS, glucanase and chitinase genes that were grouped into Class I and II might contribute to production of the resistance to PM in resistant cultivated variety. Furthermore, several members of Pathogen Response-2 family, such as glucanases and chitinases, were identified as DEGs, suggesting that cucumber might enhance the resistance to PM by accelerating the degradation of the pathogen cell walls. Our data allowed us to identify and analyze more potential genes related to PM resistance.

Transpiration-dependent passive silica accumulation in cucumber (Cucumis sativus) under varying soil silicon availability

Botany ◽  
2012 ◽  
Vol 90 (10) ◽  
pp. 1058-1064 ◽  
Author(s):  
Shaji Faisal ◽  
Kristine L. Callis ◽  
Martijn Slot ◽  
Kaoru Kitajima
Keyword(s):  
Cucumis Sativus ◽  
Plant Species ◽  
Relative Importance ◽  
Passive Transport ◽  
Cucumis Sativus L ◽  
Silica Deposition ◽  
Unit Leaf ◽  
Leaf Tissues ◽  
High Concentrations ◽  
Active Processes

Regulation of the uptake of silicon (Si) varies among plant species; some species may passively transport Si, through transpiration, from soils to shoots, while others actively transport silica and deposit it in leaf tissues at high concentrations. Cucumber ( Cucumis sativus L.) accumulates moderate amounts of silica in leaves, but the relative importance of passive and active processes pertaining to silica accumulation is poorly understood. In a factorial experiment with cucumber seedlings, we manipulated transpiration rates by changing humidity and air movements around pot-grown plants receiving a daily supply of solutions containing 0, 1, 1.5, and 2 mmol Si·L–1. Higher transpiration rates resulted in significantly greater Si per unit leaf mass after 4 days, suggesting that passive processes affect the rate of silica accumulation. Actual silica accumulation during the 4-day period was significantly higher than the expected accumulation attributable to passive transport alone in 1 and 1.5 mmol Si·L–1 treatments, while passive processes alone could account for the actual silica accumulation at 2 mmol Si·L–1. We conclude that the relative importance of active and passive processes in silica deposition in cucumber leaves depends on transpiration rates and the balance between soil Si availability and plants’ demands for Si.

scholarly journals Foliar Aspersion of Salicylic Acid Improves Phenolic and Flavonoid Compounds, and Also the Fruit Yield in Cucumber (Cucumis sativus L.)

Plants ◽  
2019 ◽  
Vol 8 (2) ◽  
pp. 44 ◽  
Author(s):  
Pablo Preciado-Rangel ◽  
Juan Reyes-Pérez ◽  
Silvia Ramírez-Rodríguez ◽  
Lilia Salas-Pérez ◽  
Manuel Fortis-Hernández ◽  
...  
Keyword(s):  
Salicylic Acid ◽  
Cucumis Sativus ◽  
Foliar Application ◽  
Fruit Weight ◽  
Average Concentration ◽  
Control Treatment ◽  
Cucumis Sativus L ◽  
Phytochemical Content ◽  
High Concentrations

The aim of this research is to evaluate the effect of foliar application of salicylic acid (SA) on the yield and phytochemical content in hydroponically grown cucumber (Cucumis sativus L.). (1) Background: The importance of Mexico’s cucumber production is based on its cultivation in recent decades as one of the major winter crops; in addition, the production of vegetables under hydroponic systems has increased significantly during the last few years, with cucumber being one of the vegetables with a high economic potential. (2) Methods: A completely randomized experimental design with 15 repetitions was used. SA at five doses (0.075, 0.1, 0.15, 0.25, and 0.5 mM) and one control (distilled water) was sprinkled weekly on cucumber plants. The evaluated variables were yield (total fruit weight per plant), fruit parameters (length, size and firmness), and nutraceutical quality of cucumber. (3) Results: Low concentrations of SA improve the yield and high concentrations decrease it, but the nutraceutical quality of fruits is improved, as compared to the control treatment. (4) Conclusions: In order to obtain a higher content of bioactive compounds without affecting the yield and commercial quality of cucumber fruits, it is advisable to use the average concentration (0.15 mM) of SA.

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