High-light-like photosynthetic responses of Cucumis sativus leaves acclimated to fluorescent illumination with a high red:far-red ratio: interaction between light quality and quantity

Shibuya, Toshio; Endo, Ryosuke; Hayashi, Nobuaki; Kitaya, Yoshiaki

doi:10.1007/s11099-012-0071-1

Cited by 13 publications

(9 citation statements)

References 29 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%

“…This also supports the result of the growth analysis, in which RGR was determined mainly by LAR in both treatments. Previous studies demonstrated that the photosynthetic capacity per unit leaf area of cucumber could be improved under high-R: FR light (Hogewoning et al, 2010;Shibuya et al, 2010aShibuya et al, , 2012Shibuya et al, , 2015, but photosynthesis did not differ between the treatments in the present study. This is probably due to the relatively low PPF (300 mmol • m -2 • s -1 ), which may have concealed differences in photosynthetic capacity that might have appeared under stronger light.…”

Section: Resultscontrasting

confidence: 72%

“…Heraut-Bron et al (1999) demonstrated that the R:FR did not affect photosynthesis per unit leaf area of white clover (Trifolium repens L.). However, other reports demonstrated that low-R:FR light reduces the photosynthetic performance per unit leaf area of common bean (Phaseolus vulgaris L.), cucumber (Cucumis sativus L.), and other several species of different growth habit (Barreiro et al, 1992;Hogewoning et al, 2010;Pons and de Jong-Van Berkel, 2004;Shibuya et al, 2010aShibuya et al, , 2012Shibuya et al, , 2015, although Yang et al (2013) reported the opposite results for chrysanthemum (Chrysanthemum •grandiflorum Tzvelv). In these reports, photosynthesis of a single leaf was measured under leaf chamber conditions, and thus the results may be different from results of whole-plant photosynthesis under growing conditions, which are more appropriate to explain RGRs.…”

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confidence: 98%

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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%

Section: Resultscontrasting

confidence: 72%

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confidence: 98%

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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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“…Leaf properties of seedlings acclimatized to higher R:FR (greater Chl content and greater LMA) were similar to those of sun leaves (Lichtenthaler et al, 1981). These properties probably resulted from the heightened acclimatization to light intensity induced by higher R:FR (Shibuya et al, 2010(Shibuya et al, , 2012(Shibuya et al, , 2015, which might have affected the pathogen development. The seedlings acclimatized to higher R:FR had an increase in LMA, which generally correlates with an increase in structural defenses against pathogen invasion (Feng et al, 2009;Toome et al, 2010;Wright and Cannon, 2001), as observed in the previous study (Shibuya et al, 2011).…”

Section: Discussionmentioning

confidence: 76%

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

Itagaki¹,

Shibuya²,

Tojo³

et al. 2016

horts

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The development of powdery mildew fungus (Podosphaera xanthii) is suppressed on cucumber (Cucumis sativus L.) seedlings acclimatized to higher red-to-far-red ratio (R:FR) than natural R:FR (≈1.2), but its early development and any limiting factors are still unclear. The present study evaluated conidial germination, initial invasion, and subsequent development of P. xanthii on cucumber seedlings raised under light-emitting diode (LED) lights with R:FRs of 1.2, 5.0, or 10. There were no differences in conidial germination or initial invasion between the treatments, so there was no effect of acclimatization to R:FR on either. But, the development of hyphae, hyphal cells, and haustoria after inoculation were suppressed on seedlings acclimatized to higher R:FR. Because differences occurred only after the initial invasion, nonstructural properties of the host leaves may have affected conidial development. Higher R:FR also suppressed conidial development under natural light filtered through a photo-selective film, which absorbs near-infrared (NIR)-light. However, this effect was reduced when the plants were moved to natural R:FR after inoculation, possibly because of reacclimatization of the seedlings.

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“…Twenty seeds of each species were sown in plastic pots (11 cm diameter, 0.5 L), filled with a peat‐based potting mix (Pindstrup 2, Pindstrup Mosebrug A/S, Ryomgaard, Denmark) and grown randomly in a greenhouse with the following set points: 25/20°C day/night, ambient CO 2 , relative humidity 60–70% and a 14‐h photoperiod with a combination of natural and supplemental light (SON‐T 400W, Philips, Eindhoven, The Netherlands, red/far‐red ratio: 1.2; Shibuya et al ., ). The pots were irrigated and fertilized regularly with a nutrient solution with an N:P:K ratio of 160:35:190 (pH 5.8, electric conductivity 1.8).…”

Section: Methodsmentioning

confidence: 97%

Allopolyploidization in Cucumis contributes to delayed leaf maturation with repression of redundant homoeologous genes

Wang

Hyldgaard

et al. 2018

The Plant Journal

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The important role of polyploidy in plant evolution is widely recognized. However, many questions remain to be explored to address how polyploidy affects the phenotype of the plant. To shed light on the phenotypic and molecular impacts of allopolyploidy, we investigated the leaf development of a synthesized allotetraploid (Cucumis × hytivus), with an emphasis on chlorophyll development. Delayed leaf maturation was identified in C. × hytivus, based on delayed leaf expansion, initial chlorophyll deficiency in the leaves and disordered sink-source transition. Anatomical observations also revealed disturbed chloroplast development in C. ×hytivus. The determination of chlorophyll biosynthesis intermediates suggested that the chlorophyll biosynthesis pathway of C. × hytivus is blocked at the site at which uroporphyrinogen III is catalysed to coproporphyrinogen III. Three chlorophyll biosynthesis-related genes, HEMA1, HEME2 and POR, were significantly repressed in C. × hytivus. Sequence alignment showed both synonymous and non-synonymous substitutions in the HEMA1, HEME2 and POR genes of the parents. Cloning of the chlorophyll biosynthetic genes suggested the retention of homoeologs. In addition, a chimeric clone of the HEMA1 gene that consisted of homologous genes from the parents was identified in C. × hytivus. Overall, our results showed that allopolyploidization in Cucumis has resulted in disturbed chloroplast development and reduced chlorophyll biosynthesis caused by the repressed expression of duplicated homologous genes, which further led to delayed leaf maturation in the allotetraploid, C. × hytivus. The preferential retention/loss of certain types of genes and non-reciprocal homoeologous recombination were also supported in the present study, which provides new insights into the impact of allopolyploidy.

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High-light-like photosynthetic responses of Cucumis sativus leaves acclimated to fluorescent illumination with a high red:far-red ratio: interaction between light quality and quantity

Cited by 13 publications

References 29 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

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

Allopolyploidization in Cucumis contributes to delayed leaf maturation with repression of redundant homoeologous genes

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