Leaf anatomy and gas exchange of ornamental sunflower in response to silicon application
Silicon applied to substrate for greenhouse cultivation of ornamental pot plants can improve the yield and quality of the ornamental product; however, the possible anatomical and physiological changes caused by Si have to be assessed. Therefore, the objective of this study was to evaluate gas excha...
| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
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Universidade Federal de Uberlândia
2017-07-01
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| Series: | Bioscience Journal |
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| Online Access: | https://seer-dev.ufu.br/index.php/biosciencejournal/article/view/36559 |
| _version_ | 1828857892974886912 |
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| author | Luiz Antônio Zanão Júnior Victor Hugo Alvarez Venegas Renildes Lúcio Ferreira Fontes Maristela Pereira Carvalho-Zanão Jaqueline Dias-Pereira Leila Teresinha Maranho Natália Pereira |
| author_facet | Luiz Antônio Zanão Júnior Victor Hugo Alvarez Venegas Renildes Lúcio Ferreira Fontes Maristela Pereira Carvalho-Zanão Jaqueline Dias-Pereira Leila Teresinha Maranho Natália Pereira |
| author_sort | Luiz Antônio Zanão Júnior |
| collection | DOAJ |
| description |
Silicon applied to substrate for greenhouse cultivation of ornamental pot plants can improve the yield and quality of the ornamental product; however, the possible anatomical and physiological changes caused by Si have to be assessed. Therefore, the objective of this study was to evaluate gas exchange rates and leaf anatomy of ornamental sunflower 'Sunbright' grown on a substrate amended with Si. The experiment was conducted in a greenhouse, and the treatments consisted of sunflower plants cultivated in pots containing 600 g substrate fertilized with Si at rates of 0, 0.25, 0.50, 0.75, and 1.00Â g kg-1. The treatments were arranged in randomized complete block design and four replications. Samples from the middle region of leaf blades in the sixth pair from the apex were collected and analyzed morphometrically. Epidermal trichomes were analyzed using diaphanization and scanning electron microscopy with energy-dispersive X-ray spectroscopy. The following traits were determined: leaf blade thickness, palisade and spongy parenchyma thickness, mesophyll thickness, and abaxial and adaxial epidermis thickness. Net photosynthesis, stomatal conductance and transpiration rates were determined in the fifth leaf at the beginning of the flowering stage by an infrared gas analyzer. The data were subjected to ANOVA and regression analyses. The results indicate that the ornamental sunflower 'Sunbright' accumulates Si in leaf trichomes, and that leaf thickness is not affected by Si application to the substrate; however, transpiration rates decrease while net photosynthesis rate and stomatal conductance increase in response to Si application.
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| first_indexed | 2024-12-13T01:45:43Z |
| format | Article |
| id | doaj.art-f2a1aeb20b1f4f68bcc0ab74eaf48aef |
| institution | Directory Open Access Journal |
| issn | 1981-3163 |
| language | English |
| last_indexed | 2024-12-13T01:45:43Z |
| publishDate | 2017-07-01 |
| publisher | Universidade Federal de Uberlândia |
| record_format | Article |
| series | Bioscience Journal |
| spelling | doaj.art-f2a1aeb20b1f4f68bcc0ab74eaf48aef2022-12-22T00:03:39ZengUniversidade Federal de UberlândiaBioscience Journal1981-31632017-07-01334Leaf anatomy and gas exchange of ornamental sunflower in response to silicon application Luiz Antônio Zanão Júnior0Victor Hugo Alvarez Venegas1Renildes Lúcio Ferreira Fontes2Maristela Pereira Carvalho-Zanão3Jaqueline Dias-Pereira4Leila Teresinha Maranho5Natália Pereira6Instituto Agronômico do ParanáUniversidade Federal de Viçosa Departamento de SolosUniversidade Federal de Viçosa Departamento de SolosInstituto Agronômico do ParanáUniversidade Federal de Viçosa Campus Rio ParanaíbaUniversidade PositivoUNIOESTE Pós-graduação em Engenharia de Energia na Agricultura Silicon applied to substrate for greenhouse cultivation of ornamental pot plants can improve the yield and quality of the ornamental product; however, the possible anatomical and physiological changes caused by Si have to be assessed. Therefore, the objective of this study was to evaluate gas exchange rates and leaf anatomy of ornamental sunflower 'Sunbright' grown on a substrate amended with Si. The experiment was conducted in a greenhouse, and the treatments consisted of sunflower plants cultivated in pots containing 600 g substrate fertilized with Si at rates of 0, 0.25, 0.50, 0.75, and 1.00Â g kg-1. The treatments were arranged in randomized complete block design and four replications. Samples from the middle region of leaf blades in the sixth pair from the apex were collected and analyzed morphometrically. Epidermal trichomes were analyzed using diaphanization and scanning electron microscopy with energy-dispersive X-ray spectroscopy. The following traits were determined: leaf blade thickness, palisade and spongy parenchyma thickness, mesophyll thickness, and abaxial and adaxial epidermis thickness. Net photosynthesis, stomatal conductance and transpiration rates were determined in the fifth leaf at the beginning of the flowering stage by an infrared gas analyzer. The data were subjected to ANOVA and regression analyses. The results indicate that the ornamental sunflower 'Sunbright' accumulates Si in leaf trichomes, and that leaf thickness is not affected by Si application to the substrate; however, transpiration rates decrease while net photosynthesis rate and stomatal conductance increase in response to Si application. https://seer-dev.ufu.br/index.php/biosciencejournal/article/view/36559Helianthus annuus L.PhotosynthesisMicromorphometry |
| spellingShingle | Luiz Antônio Zanão Júnior Victor Hugo Alvarez Venegas Renildes Lúcio Ferreira Fontes Maristela Pereira Carvalho-Zanão Jaqueline Dias-Pereira Leila Teresinha Maranho Natália Pereira Leaf anatomy and gas exchange of ornamental sunflower in response to silicon application Bioscience Journal Helianthus annuus L. Photosynthesis Micromorphometry |
| title | Leaf anatomy and gas exchange of ornamental sunflower in response to silicon application |
| title_full | Leaf anatomy and gas exchange of ornamental sunflower in response to silicon application |
| title_fullStr | Leaf anatomy and gas exchange of ornamental sunflower in response to silicon application |
| title_full_unstemmed | Leaf anatomy and gas exchange of ornamental sunflower in response to silicon application |
| title_short | Leaf anatomy and gas exchange of ornamental sunflower in response to silicon application |
| title_sort | leaf anatomy and gas exchange of ornamental sunflower in response to silicon application |
| topic | Helianthus annuus L. Photosynthesis Micromorphometry |
| url | https://seer-dev.ufu.br/index.php/biosciencejournal/article/view/36559 |
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