Early Development of Powdery Mildew on Cucumber Leaves Acclimatized to Illumination with Different Red-to-far-red Ratios

Itagaki, Kaori; Shibuya, Toshio; Tojo, Motoaki; Endo, Ryosuke; Kitaya, Yoshiaki

doi:10.21273/hortsci.51.5.530

Cited by 5 publications

(3 citation statements)

References 31 publications

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“…The LMA and shoot length of the high-R:FR seedlings were greater (113%) and shorter (71%), respectively, than those of the normal R:FR seedlings. These morphological traits of the high-R:FR seedlings agree with previous reports (Hogewoning et al, 2010;Shibuya et al, 2010aShibuya et al, , 2012Shibuya et al, , 2015, and suggest that the plants would have improved tolerance to the environmental stress (Itagaki et al, 2016;Latimer and Mitchell, 1988;Shibuya et al, 2010bShibuya et al, , 2011 when they are used as transplants.…”

Section: Resultssupporting

confidence: 90%

Growth Analysis and Photosynthesis Measurements of Cucumber Seedlings Grown under Light with Different Red to Far-red Ratios

Shibuya¹,

Endo²,

Kitaya³

et al. 2016

horts

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Light with a higher red to far-red ratio (R:FR) than sunlight reduces plant growth, but the cause has not been firmly established. In the present study, cucumber seedlings were grown under normal light (similar to sunlight; R:FR = 1.4) from metal-halide lamps or high-R:FR light (R:FR = 4.3) created by transmitting their light through FR-absorbing film, and then their growth parameters and photosynthesis were compared. The relative growth rate (RGR) at high R:FR was 92% of that under normal R:FR, although the net assimilation rate (NAR) did not differ between the treatments, indicating that changes in net photosynthesis per unit leaf area did not cause the growth inhibition at high R:FR. The CO2 exchange per unit leaf area did not differ between the treatments, which supports this hypothesis. The leaf area ratio (LAR) of total plant dry weight of high R:FR seedlings to that of normal R:FR seedlings was also 92%. This suggests that growth suppression in the high R:FR seedlings was caused mainly by decreased LAR. The specific leaf area (SLA) and leaf weight ratio (LWR), components of LAR, under high-R:FR light were 89% and 105%, respectively, of those under normal light, indicating that the smaller LAR at high R:FR mainly results from suppressed leaf enlargement per unit leaf dry matter.

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Section: Resultssupporting

confidence: 90%

Growth Analysis and Photosynthesis Measurements of Cucumber Seedlings Grown under Light with Different Red to Far-red Ratios

Shibuya¹,

Endo²,

Kitaya³

et al. 2016

horts

Self Cite

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“…Phytochromes positively regulated Nicotiana tabacum against CMV [26] and ChiVMV [27] via a salicylic acid-dependent pathway. In addition, changes in the light conditions can also affect the JA pathway, which modulates the plant resistance to pathogens, such as Podosphaera xanthii [45], Pseudomonas syringae [46], Magnaporthe grisea [25], and Botrytis cinerea [23]. In this study, JA signal pathway of soybean plants was repressed in the shade.…”

Section: Resultsmentioning

confidence: 84%

Comparison of Transcriptome Differences in Soybean Response to Soybean Mosaic Virus under Normal Light and in the Shade

Zhang

Shang

Wang

et al. 2019

Viruses

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Shading in the intercropping system is a major abiotic factor which influences soybean growth and development, while soybean mosaic virus (SMV) is a biotic factor that limits the yield and quality of soybean. However, little is known about the defense response of soybean to SMV in the shade. Thus, in the current study, both intensity and quality (red:far-red, R:FR) of the light were changed to simulate the shaded environment and comparative transcriptome analysis was performed. Morphologically, plant growth was inhibited by SMV, which decreased 35.93% of plant height and 8.97% of stem diameter in the shade. A total of 3548 and 4319 differentially expressed genes (DEGs) were identified in soybean plants infected with SMV under normal light and in the shade. Enrichment analysis showed that the plant defense-related genes were upregulated under normal light but downregulated in the shade. Pathways that were repressed include plant-pathogen interaction, secondary metabolism, sugar metabolism, and vitamin metabolism. In addition, genes associated with signaling pathways such as salicylic acid (SA), jasmonic acid (JA), and ethylene (ETH) were also downregulated in the shade. A qRT-PCR assay of 15 DEGs was performed to confirm transcriptome results. According to our knowledge, this is the first report on soybean response to dual stress factors. These results provide insights into the molecular mechanisms in which soybean plants were infected with SMV in the shade.

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“…Powdery mildew caused by Podosphaera xanthii has been reduced in cucumber seedlings acclimatized to high R:FR ( Schuerger and Brown, 1997 ; Shibuya et al, 2011 ). Altered conidial development and fungal invasion seem to result from structural and non-structural modifications of leaves in response to high R:FR, such as thickened epidermal tissue, higher leaf mass per area, and altered secondary metabolism ( Shibuya et al, 2011 ; Itagaki et al, 2016 ). Far-red light also reduced the red light-inhibition of powdery mildew in roses ( Suthaparan et al, 2010b ).…”

Section: The Role Of Lightmentioning

confidence: 99%

Influence of Light on Plant–Phyllosphere Interaction

2018

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Plant–phyllosphere interactions depend on microbial diversity, the plant host and environmental factors. Light is perceived by plants and by microorganisms and is used as a cue for their interaction. Photoreceptors respond to narrow-bandwidth wavelengths and activate specific internal responses. Light-induced plant responses include changes in hormonal levels, production of secondary metabolites, and release of volatile compounds, which ultimately influence plant–phyllosphere interactions. On the other hand, microorganisms contribute making some essential elements (N, P, and Fe) biologically available for plants and producing growth regulators that promote plant growth and fitness. Therefore, light directly or indirectly influences plant–microbe interactions. The usage of light-emitting diodes in plant growth facilities is helping increasing knowledge in the field. This progress will help define light recipes to optimize outputs on plant–phyllosphere communications. This review describes research advancements on light-regulated plant–phyllosphere interactions. The effects of full light spectra and narrow bandwidth-wavelengths from UV to far-red light are discussed.

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Early Development of Powdery Mildew on Cucumber Leaves Acclimatized to Illumination with Different Red-to-far-red Ratios

Cited by 5 publications

References 31 publications

Growth Analysis and Photosynthesis Measurements of Cucumber Seedlings Grown under Light with Different Red to Far-red Ratios

Growth Analysis and Photosynthesis Measurements of Cucumber Seedlings Grown under Light with Different Red to Far-red Ratios

Comparison of Transcriptome Differences in Soybean Response to Soybean Mosaic Virus under Normal Light and in the Shade

Influence of Light on Plant–Phyllosphere Interaction

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