Effects of Light Quality on Physiological Characteristics of Tomato Seedlings

Stomatal opening/closure plays a key role in balancing a plant’s need to conserve water, while still allowing for the exchange of photosynthetic and respiratory gasses with the atmosphere. Stomatal opening/closure can be induced by differences in light quality but a detailed knowledge of the role of light in stomatal regulation in tomato is limited. In this study, we evaluated red and blue light-dependent stomatal opening processes in tomato seedlings and explored the mechanisms involved using different light-quality treatments. After 10 h of darkness, tomato seedlings were subjected to the following five treatments: monochromatic red light (R), 33% blue (2R1B), 50% blue (1R1B), 67% blue (1R2B), and monochromatic blue light (B) at 200 μmol m−2s−1light intensity. The highest stomatal conductance recorded were for 1R1B. Stomatal aperture under 1R1B showed a 92.8% increase after 15 min and a 28.6% increase after 30 min compared with under R alone. Meanwhile, the study shows that the expressions of the plasma membrane H+-ATPase in the leaf were regulated by different proportions of blue light. The results show that the expressions of HA1 and HA4 increased under 1R1B and 1R2B after 15 min of exposure compared with under R alone. Under 1R1B, our results also show net photosynthesis increased compared with R and B after longer treatments, which may be related to chloroplast ultrastructure, and leaf dry weight increased compared with under 1R2B or B alone, but there were no differences under the R and 2R1B light treatments.

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Effects of Selenium on Growth and Physiological Characteristics of Tomato Seedlings

Proceedings of the 2018 7th International Conference on Energy, Environment and Sustainable Development (ICEESD 2018) ◽

10.2991/iceesd-18.2018.62 ◽

2018 ◽

Author(s):

Jichao Liao ◽

Guochao Sun ◽

Yi Tang

Keyword(s):

Physiological Characteristics ◽

Tomato Seedlings

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Growth Responses of Tomato Seedlings to Different Spectra of Supplemental Lighting

HortScience ◽

10.21273/hortsci.50.1.112 ◽

2015 ◽

Vol 50 (1) ◽

pp. 112-118 ◽

Cited By ~ 19

Author(s):

Celina Gómez ◽

Cary A. Mitchell

Keyword(s):

High Pressure ◽

Blue Light ◽

Light Quality ◽

Dry Weight ◽

Growth Responses ◽

Light Emitting ◽

Tomato Seedlings ◽

Shoot Dry Weight ◽

Supplemental Lighting ◽

Developmental Responses

Seedlings of six tomato (Solanum lycopersicum) cultivars (‘Maxifort’, ‘Komeett’, ‘Success’, ‘Felicity’, ‘Sheva Sheva’, and ‘Liberty’) were grown monthly for 2-week treatment periods to determine photomorphogenic and developmental responses to different light-quality treatments from supplemental lighting (SL) across changing solar daily light integrals (DLIs). Seedlings were grown in a glass-glazed greenhouse at a midnorth latitude (lat. 40° N, long. 86° W) under one of five lighting treatments: natural solar light only (control), natural + SL from a 100-W high-pressure sodium (HPS) lamp, or natural + SL from arrays of red and blue light-emitting diodes (LEDs) using 80% red + 20% blue, 95% red + 5% blue, or 100% red. Varying solar DLI occurred naturally for all treatments, whereas constant DLI of 5.1 mol·m−2·d−1 was provided for all SL treatments. Supplemental lighting increased hypocotyl diameter, epicotyl length, shoot dry weight, leaf number, and leaf expansion relative to the control, whereas hypocotyl elongation decreased when SL was applied. For all cultivars tested, the combination of red and blue in SL typically increased growth of tomato seedlings. These results indicate that blue light in SL has potential to increase overall seedling growth compared with blue-deficient LED SL treatments in overcast, variable-DLI climates.

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Cell wall structure and composition is affected by light quality in tomato seedlings

Journal of Photochemistry and Photobiology B Biology ◽

10.1016/j.jphotobiol.2019.111745 ◽

2020 ◽

Vol 203 ◽

pp. 111745 ◽

Cited By ~ 1

Author(s):

Renan Falcioni ◽

Thaise Moriwaki ◽

Marina Perez-Llorca ◽

Sergi Munné-Bosch ◽

Mariana Sversut Gibin ◽

...

Keyword(s):

Cell Wall ◽

Light Quality ◽

Cell Wall Structure ◽

Wall Structure ◽

Tomato Seedlings

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Effects of ozone water irrigation and spraying on physiological characteristics and gene expression of tomato seedlings

Horticulture Research ◽

10.1038/s41438-021-00618-8 ◽

2021 ◽

Vol 8 (1) ◽

Author(s):

Jin-Peng Xu ◽

Yan-Chong Yu ◽

Tao Zhang ◽

Qian Ma ◽

Hong-Bing Yang

Keyword(s):

Water Treatment ◽

Nitrogen Content ◽

Antioxidant Enzyme ◽

Chlorophyll Synthesis ◽

Physiological Characteristics ◽

Nitrogen Absorption ◽

Tomato Seedlings ◽

Spad Value ◽

Expression Of Genes ◽

Mda Content

AbstractTomato seedlings were used as experimental materials and treated with 1.0, 2.0, 3.0, and 4.0 mg/L ozone water irrigation and 0.2, 0.4, 0.6, and 0.8 mg/L ozone water spray treatments. Indexes including the malondialdehyde (MDA) content, superoxide dismutase (SOD), peroxidase (POD) and catalase (CAT), activities, soil and plant analysis development (SPAD) value, and nitrogen content of leaves were measured. Furthermore, the expression of antioxidant enzyme, chlorophyll synthesis and nitrogen absorption genes was analyzed after optimal ozone water treatment. The results showed that the activities of antioxidant enzymes in tomato leaves were significantly increased, and the MDA content in tomato leaves was significantly reduced by ozone water irrigation and spray treatment, which indicated that ozone water treatment can significantly improve the stress tolerance of tomato seedlings. Ozone water irrigation and spraying could also significantly increase the leaf SPAD value and nitrogen content of tomato seedlings, and the optimal concentrations of ozone water irrigation and spraying were 3.0 mg/L and 0.6 mg/L, respectively. The effect of ozone water irrigation on improving the physiological characteristics of tomato seedlings was better than that of spraying. After treatment with the optimal concentration of ozone water, the relative expression of antioxidant enzyme, chlorophyll synthesis, and nitrogen absorption genes was significantly increased, and the maximum expression level was reached at 12 h. In addition, ozone water irrigation could promote the expression of genes more than ozone water spraying, which was consistent with the improvements in the physiological characteristics of the tomato seedlings.

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