Photosynthetica 2022, 60(4):521-528 | DOI: 10.32615/ps.2022.045

Evidence of photosynthetic acclimation to self-shading in sugarcane canopies

R.L. ALMEIDA1, 2, N.M. SILVEIRA1, M.T. MIRANDA1, 2, V.S. PACHECO2, L.P. CRUZ2, M.A. XAVIER3, E.C. MACHADO1, R.V. RIBEIRO2
1 Laboratory of Plant Physiology 'Coaracy M. Franco', Center for Agricultural and Post-Harvest Biosystems, Agronomic Institute (IAC), Campinas, SP, Brazil
2 Laboratory of Crop Physiology (LCroP), Department of Plant Biology, Institute of Biology, University of Campinas (UNICAMP), Campinas, SP, Brazil
3 Center R&D in Sugarcane, IAC, Ribeirão Preto, SP, Brazil

Increasing the efficiency of photosynthesis in sugarcane canopies is the key for improving crop yield. Herein, we evaluated the photosynthetic performance along the canopy of ten sugarcane cultivars and three Saccharum species. Canopy morphological traits were evaluated, and leaf gas exchange was measured in the first (sun-exposed, +1) and the fourth (shaded, +4) fully expanded leaves and under low- and high-light conditions. Similar photosynthetic capacity was found in leaves +1 and +4 under high light in genotypes with a high leaf area index and a high fraction of the sky blocked by the foliage (> 85%). Interestingly, such canopy characteristics cause low light availability to leaves +4, suggesting the photosynthetic acclimation of these leaves to self-shading in some genotypes. We highlight IACCTC06-8126 and CTC4 as those genotypes with higher canopy photosynthetic capacity, presenting high leaf area, high photosynthetic rates in sun-exposed leaves, and high responsiveness of shaded leaves to increasing light availability.

Additional key words: light; photosynthesis; plant canopy; Saccharum spp.

Received: August 23, 2022; Revised: August 23, 2022; Accepted: September 29, 2022; Prepublished online: October 20, 2022; Published: December 21, 2022  Show citation

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ALMEIDA, R.L., SILVEIRA, N.M., MIRANDA, M.T., PACHECO, V.S., CRUZ, L.P., XAVIER, M.A., MACHADO, E.C., & RIBEIRO, R.V. (2022). Evidence of photosynthetic acclimation to self-shading in sugarcane canopies. Photosynthetica, 60(4), 521-528. doi: 10.32615/ps.2022.045
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