Annals of the Brazilian Congress of Plant Physiology and Ibero-latinamerican Congress of Plant Biology

CANOPY STRUCTURE, SELF-SHADING AND PHOTOSYNTHESIS IN SACCHARUM COMPLEX

Published in 26/09/2022 - ISBN: 978-65-5941-830-5

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Paper Title
CANOPY STRUCTURE, SELF-SHADING AND PHOTOSYNTHESIS IN SACCHARUM COMPLEX
Authors
  • Rafael Leonardo de Almeida
  • NEIDIQUELE MARIA SILVEIRA
  • Marcela Trevenzoli Miranda
  • Vinícius SacramentoPacheco
  • Larissa Prado da Cruz
  • Mauro Alexandre Xavier
  • Eduardo Caruso Machado
  • Rafael Vasconcelos Ribeiro
Modality
Abstract
Subject area
Plant Physiology
Publishing Date
26/09/2022
Country of Publishing
Brasil
Language of Publishing
Inglês
Paper Page
https://www.even3.com.br/anais/cbfv2022_registration/511547-canopy-structure-self-shading-and-photosynthesis-in-saccharum-complex
ISBN
978-65-5941-830-5
Keywords
sugarcane, plant canopy, biomass, photosynthetic performance
Summary
Sugarcane, is a promising alternative for the bioenergy sector due its high biomass production. Increasing the efficiency of photosynthesis in plant canopy is the key for higher crop yield, and studies dealing with canopy photosynthesis or even leaves with different light exposure are limited. We evaluated the photosynthetic performance along the canopy of several sugarcane cultivars originated from crosses between 1948 and 2006 and three Saccharum species, emphasizing the effects of self-shading and leaf aging while addressing the underlying process driving photosynthetic rates. Canopy morphological traits were evaluated and leaf gas exchange was measured in leaves +1 and +4, under low (200 ?mol m-2s-1) and high (2000 ?mol m-2s-1) light. We found differences for leaf area index and light intensity reaching the bottom canopy positions, i.e. leaves +4. Significant variation among genotypes was found for photosynthetic rates of leaves +1 and +4 under high light and of leaves +4 under low light, which was most related to differences in instantaneous carboxylation efficiency and quantum efficiency of CO2 assimilation. Our data revealed similar photosynthetic capacity in leaves +1 and +4 under high light, which occurred in genotypes with high leaf area index (>2.3 m2m-2) and high fraction of the sky blocked by the foliage (> 85%), showing top leaves with planophile-like orientation. Similar photosynthesis between leaves +1 and +4 suggests that leaves +4 are able to photosynthetize under high light although light intensity reaching those leaves is commonly less than 25% of one reaching leaves +1. Canopy profiles exhibiting homogeneous photosynthesis or similar photosynthetic capacity through leaf layers would support higher biomass production and crop yield. Our data highlight IACCTC06?8126 and CTC4 as the genotypes with higher canopy photosynthetic capacity, presenting high leaf area, high photosynthetic rates in exposed leaves and high photosynthetic responsiveness of bottom leaves to high light.
Title of the Event
XVIII Brazilian Congress of Plant Physiology and I Ibero-latinoamerican Congress of Plant Biology
City of the Event
Porto Alegre
Title of the Proceedings of the event
Annals of the Brazilian Congress of Plant Physiology and Ibero-latinamerican Congress of Plant Biology
Name of the Publisher
Even3
Means of Dissemination
Meio Digital

How to cite

ALMEIDA, Rafael Leonardo de et al.. CANOPY STRUCTURE, SELF-SHADING AND PHOTOSYNTHESIS IN SACCHARUM COMPLEX.. In: Annals of the Brazilian Congress of Plant Physiology and Ibero-latinamerican Congress of Plant Biology. Anais...Porto Alegre(RS) CEPUCRS, 2022. Available in: https//www.even3.com.br/anais/cbfv2022_registration/511547-CANOPY-STRUCTURE-SELF-SHADING-AND-PHOTOSYNTHESIS-IN-SACCHARUM-COMPLEX. Access in: 09/05/2025

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