Limitation to photosynthesis in leaves of eggplant under UVB according to anatomical changes and alterations on the antioxidant system

Romanatti, Priscila Vasconcellos; Rocha, Gabriela Azevedo; Júnior, Valdir Veroneze; Filho, Plínio R. Santos; Souza, Thiago Corrêa de; Pereira, Fabricio José; Polo, Marcelo

doi:10.1016/j.scienta.2019.01.060

Cited by 16 publications

(7 citation statements)

References 27 publications

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“…However, the net assimilation rates were low for both treatments. Romanatti et al (2019) reported an assimilation rate of 15.1 μmol CO 2 m –2 s –1 at a light intensity of 700 μmol m –2 s –1 and 390ppm CO 2 , whereas we measured 12.0 and 9.0 μmol CO 2 m –2 s –1 at a light intensity of 800 μmol m –2 s –1 for the RWB + FR and RWB treatments, respectively. This indicates that the photosynthetic performance under the LED treatments was suboptimal and further research toward a sustainable cultivation method that includes LED lighting is required.…”

Section: Discussioncontrasting

confidence: 67%

LED Lighting Strategies Affect Physiology and Resilience to Pathogens and Pests in Eggplant (Solanum melongena L.)

et al. 2021

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Over the last decade, LED lighting has gained considerable interest as an energy-efficient supplemental light source in greenhouse horticulture that can change rapidly in intensity and spectral composition. Spectral composition not only affects crop physiology but may also affect the biology of pathogens, pests, and their natural enemies, both directly and indirectly through an impact on induced plant resistance. In this study, we investigated the effects of light spectrum against a background of sunlight on growth and development of Solanum melongena. These effects were related to the spectral effects on the establishment of populations of the predatory mite Amblyseius swirskii and plant resilience against the biotrophic fungus powdery mildew, the necrotrophic fungus botrytis, and the herbivorous arthropod Western flower thrips. The effects of a reduced red/far-red (R:FR) ratio were studied under two ratios of red to blue light. Far-red light either was supplied additionally to the photosynthetic photon flux density (PPFD) or partially replaced PPFD, while maintaining total photon flux density (PFD). Effects of white light or additional UV-B light on plant resilience was tested, compared to the reference (5% blue, 5% green, and 90% red light). Plant biomass in the vegetative phase increased when additional far-red light was supplied. Stem length increased with far-red, irrespective of PPFD and the percentage of blue light. In the generative phase, total shoot biomass and fruit fresh weights were higher under additional far-red light, followed by the treatments where far-red partly replaced PPFD. Far-red light increased biomass partitioning into the fruits, at the expense of the leaves. There were no differences in population growth of A. swirskii mites between light treatments, nor did light treatment have an effect on the vertical distribution of these predatory mites in the plants. The treatments with additional far-red light reduced the infection rate of powdery mildew, but increased botrytis infection. These differences might be due to the plant defenses acting against these pathogens evolving from two different regulatory pathways. These results show that positive effects of altered spectral compositions on physiological responses were only moderately compensated by increased susceptibility to fungal pathogens, which offers perspective for a sustainable greenhouse horticulture.

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Section: Discussioncontrasting

confidence: 67%

LED Lighting Strategies Affect Physiology and Resilience to Pathogens and Pests in Eggplant (Solanum melongena L.)

et al. 2021

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“…Additionally, the spongy parenchyma tissue porosity is essential for mesophyll diffusion conductance to CO 2 , being recognized at present as being a major limiting factor for photosynthesis and for photosynthetic resource use efficiency [109]. Recent studies demonstrated that spongy parenchyma cells are also photosynthetically active under UV stress [110].…”

Section: Discussionmentioning

confidence: 99%

Effects of Foliar Treatment with a Trichoderma Plant Biostimulant Consortium on Passiflora caerulea L. Yield and Quality

et al. 2020

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The influence of spore concentration on the ability of a Trichoderma consortium to colonize the Passiflora caerulea phyllosphere was evaluated by determining the effects of foliar treatments with two spore concentrations, in two repeated treatments, on the morphological, physiological, and ultrastructural characteristics, and on the yield and quality of P. caerulea. The studied crop quality features were related to its nutraceutical use: the accumulation of polyphenols and flavonoids, antioxidant activity, and effects on mouse fibroblast L929 cells. The Trichoderma consortium consisted of two strains, T. asperellum T36b and T. harzianum Td50b, and the concentrations used were 106 colony forming units (cfu)/mL and 108 cfu/mL. As a reference treatment, a commercial product that was based on herbs and algal extracts was used. As compared to the negative control, the treatment with the Trichoderma consortium at 108 cfu/mL concentration determines the accumulation of higher level of polyphenols and flavonoids and increased antioxidant activity. This enhancement of P. caerulea quality characteristics after treatment with the higher concentration of Trichoderma consortium was associated with larger leaves, increased number and size of chloroplasts, improved plant physiology characteristics, and an increased yield. The treatment with high concentration of Trichoderma consortium spores promotes phyllosphere colonization and benefits both crop yield and quality.

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“…The anatomical studies showed the reduction in total thickness of leaves under eUV-B which was associated with reduction in adaxial epidermis, spongy parenchyma and abaxial epidermis. Similarly, Kakani et al (2003) and Romanatti et al (2019) also reported reduction in leaf thickness in cotton and eggplant, respectively. The adaxial surface of leaves, that was directly exposed to eUV-B showed highest reduction of 41.16%.…”

Section: Discussionmentioning

confidence: 73%

Ultraviolet-B induced responses of Psoralea corylifolia L. with special emphasis on: growth, anatomy, physiology, yield, essential oil content and composition

Pandey

Agrawal

2021

Preprint

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Psoralea corylifolia L. is a traditionally and medicinally important, endangered plant of the family Fabaceae. Seeds obtained from it widely used in treatment of skin diseases like leprosy, psoriasis, leucoderma, vitiligo. The present study was aimed to assess the growth, physiology, anatomy, yield and essential oil content and composition of P. corylifolia in response to elevated UV-B (eUV-B; ambient + 7.2 kJm− 2day− 1). The results showed reductions in the growth and physiological parameters under eUV-B treatment (except chlorophyll a/b ratio, carotenoids content and water use efficiency which showed increment) while reverse trend was observed for UV-B absorbing compounds. The total thickness of leaves decreased by 13.8% under eUV-B exposure. Due to eUV-B exposure number of racemes, flowers and seeds, and the length of racemes significantly reduced whereas length of flowers, seed size and seed mass (thousand seeds weight) showed non-significant variations. The essential oil content of seeds showed increment by 46.4% under eUV-B treatment. The GC-MS analysis of essential oil revealed 28 major compounds from control and eUV-B exposed plants. Overall the monoterpenes showed reduction whereas sesquiterpenes and meroterpene showed increment. The metabolites caryophyllene, caryophyllene oxide and bakuchiol (possess anti-cancerous, anti-inflammatory activities) were identified as major metabolites of essential oil, which showed increment under eUV-B treatment. The study displayed that eUV-B enhanced the content of essential oil with improvement in the quality of seeds in terms of medicinally important compounds of seeds.

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Limitation to photosynthesis in leaves of eggplant under UVB according to anatomical changes and alterations on the antioxidant system

Cited by 16 publications

References 27 publications

LED Lighting Strategies Affect Physiology and Resilience to Pathogens and Pests in Eggplant (Solanum melongena L.)

LED Lighting Strategies Affect Physiology and Resilience to Pathogens and Pests in Eggplant (Solanum melongena L.)

Effects of Foliar Treatment with a Trichoderma Plant Biostimulant Consortium on Passiflora caerulea L. Yield and Quality

Ultraviolet-B induced responses of Psoralea corylifolia L. with special emphasis on: growth, anatomy, physiology, yield, essential oil content and composition

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