Tolerance to mild shading levels in cattail as related to increased photosynthesis and changes in its leaf area and anatomy.

Autor: Dos Reis CHG; Instituto de Ciências Naturais (ICN), Universidade Federal de Lavras, Campus Universitário, Lavras, MG, 37200-900, Brazil., da Silva PN; Instituto de Ciências Naturais (ICN), Universidade Federal de Lavras, Campus Universitário, Lavras, MG, 37200-900, Brazil., de Castro EM; Instituto de Ciências Naturais (ICN), Universidade Federal de Lavras, Campus Universitário, Lavras, MG, 37200-900, Brazil., Pereira FJ; Instituto de Ciências da Natureza (ICN), Universidade Federal de Alfenas, Rua Gabriel Monteiro da Silva, 700, Centro, Alfenas, MG, 37130- 001, Brazil. fabricio.pereira@unifal-mg.edu.br.
Jazyk: angličtina
Zdroj: Journal of plant research [J Plant Res] 2024 Jul; Vol. 137 (4), pp. 627-640. Date of Electronic Publication: 2024 Mar 22.
DOI: 10.1007/s10265-024-01538-z
Abstrakt: Shading is an environmental factor that has been little investigated regarding its effects on emergent aquatic plants. Typha domingensis Pers. is an emergent macrophyte that demonstrates some plasticity for self-shading, and as it can shade other species in the same area, the effect of shading on its traits deserves further investigation. The objective of the present study was to evaluate the gas exchange, leaf anatomy, and growth of T. domingensis cultivated under increasing shading intensities. The plants were collected and propagated in a greenhouse, and the clones were subjected to four shading intensities: 0% (unshaded), 35%, 73%, and 83% shading created by black nets. Growth traits, clonal production, photosynthesis, transpiration, and leaf anatomy were evaluated. The 73% and 83% shading promoted the death of all plants, but all plants survived in the 35% and unshaded treatments. Compared with the unshaded treatment, the 35% shading treatment promoted a higher photosynthetic rate and greater transpiration, supporting increased growth and production of clones. The increase in the photosynthetic rate in the 35% shading was related to the increase in leaf area which increased the photosynthesis of the whole plant. The 73% and 83% treatments inhibited the development of photosynthetic parenchyma and stomata in T. domingensis, leading to a drastic reduction in photosynthesis and energy depletion. Therefore, T. domingensis does not tolerate intense shading, but its photosynthetic characteristics and growth are favored by mild shading, a factor that may be of great importance for its competitiveness and invasive behavior.
(© 2024. The Author(s) under exclusive licence to The Botanical Society of Japan.)
Databáze: MEDLINE
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