Implicações do uso de malhas de sombreamento e densidade de plantas na anatomia foliar de mudas de Corymbia citriodora (Hook.) K.D. Hill & L.A.S. Johnson

Claiton Nardini; João Antônio de Cristo; Braulio Otomar Caron; Gabrieli Cristina Vitalli de Azevedo; Matheus Milani Pretto; Erick dos Santos Silva; Jaqueline Sgarbossa; Elder Eloy; Denise Schmidt

doi:10.53661/1806-9088202549263842

Authors

Claiton Nardini Universidade Federal do Paraná, Programa de Pós-Graduação em Engenharia Florestal, Curitiba, PR, Brasil https://orcid.org/0000-0001-5791-6720
João Antônio de Cristo Universidade Federal do Paraná, Programa de Pós-Graduação em Engenharia Florestal, Curitiba, PR, Brasil https://orcid.org/0000-0001-5720-8409
Braulio Otomar Caron Universidade Federal de Santa Maria, Departamento de Ciências Agronômicas e Ambientais, Frederico Westphalen, RS, Brasil https://orcid.org/0000-0002-6557-3294
Gabrieli Cristina Vitalli de Azevedo Universidade Federal de Santa Maria, Graduado em Agronomia, Frederico Westphalen, RS, Brasil https://orcid.org/0000-0002-8569-3031
Matheus Milani Pretto Universidade Estadual Paulista "Júlio de Mesquita Filho", Programa de Pós-Graduação em Proteção de Plantas, Botucatu, SP, Brasil https://orcid.org/0000-0001-6229-6837
Erick dos Santos Silva Universidade Federal de Santa Maria, Graduando em Agronomia, Frederico Westphalen, RS, Brasil https://orcid.org/0000-0003-2319-7451
Jaqueline Sgarbossa Universidade Federal de Santa Maria, Colégio Politécnico, Departamento de Ensino, Santa Maria, RS, Brasil https://orcid.org/0000-0001-7541-090X
Elder Eloy Universidade Federal de Santa Maria, Departamento de Engenharia Florestal, Frederico Westphalen, RS, Brasil https://orcid.org/0000-0002-5912-269X
Denise Schmidt Universidade Federal de Santa Maria, Departamento de Ciências Agronômicas e Ambientais, Frederico Westphalen, RS, Brasil https://orcid.org/0000-0002-9963-4956

DOI:

https://doi.org/10.53661/1806-9088202549263842

Keywords:

Seedling quality, Stomata, Solar radiation

Abstract

Shading meshes are important techniques used during seedling cultivation. However, improper use can lead to excessive shading, which may be intensified by the distribution of seedlings in the tray, directly affecting their growth and development. This study aimed to assess the effect of using colored shading meshes combined with different plant densities on the leaf anatomy and seedling quality of Corymbia citriodora (Hook.) K.D. Hill and L.A.S. Johnson. The experiment was conducted in a protected environment at the Federal University of Santa Maria/Frederico Westphalen campus, from May to September 2018. A completely randomized experimental design was used, in a 2 x 3 factorial scheme with two seedling densities, two shading meshes, and no mesh. The assessed densities consisted of 736 seedlings per m² (high density) and 528 seedlings per m² (medium density). The shading meshes used were in the red and blue colors, and there was a meshless (full sun) treatment as well. Assessments were conducted when seedlings reached 25 cm in height, with the following variables being analyzed: stomatal count, cuticle thickness, adaxial and abaxial epidermis thickness, spongy and palisade parenchyma thickness, as well as seedling quality through the Dickson Quality Index. The use of meshes in different colors and the plant densities altered the anatomical characteristics of Corymbia citriodora, such as cuticle and adaxial epidermis thickness, abaxial epidermis, palisade parenchyma, and leaf thickness. However, these anatomical changes observed in seedlings under different meshes do not necessarily indicate better seedling quality.

Keywords: Seedling quality, Stomata, Solar radiation