Evidence of photosynthetic acclimation to self-shading in sugarcane canopies

Almeida, R.L. de; Silveira, Neidiquele M.; Miranda, Marcela T.; Pacheco, Vinícius S.; Cruz, Larissa Prado da; Xavier, Mauro Alexandre; Machado, Eduardo Caruso; Ribeiro, Rafael V.

doi:10.32615/ps.2022.045

Cited by 1 publication

(1 citation statement)

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“…In fact, biomass production is an integrative process modulated not only by sun-exposed or newer leaves but also by shaded or older ones along the plant canopy. The effects of self-shading in sugarcane photosynthesis is largely documented (Marchiori et al 2014;Sales et al 2018;Collison et al 2020;Almeida et al 2022) and the in uence of leaf aging on photosynthetic capacity was evaluated in several species (Niinemets 2016). However, how the leaf aging affects the photosynthesis of sugarcane and its consequences for the whole canopy CO 2 assimilation remains an open question.…”

Section: Introductionmentioning

confidence: 99%

Variation of photosynthesis along the canopy profile of sugarcane and energy canes

Cruz

Pacheco

Nogueira

et al. 2023

Preprint

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Energy cane (Saccharum spp. hybrid) is a sustainable feedstock for the sucroenergetic sector due to its capacity of producing more biomass than sugarcane (Saccharum spp. hybrid). As biomass is formed by carbohydrates, photosynthesis is a key physiological process to understand the biomass production by plants. Herein, one sugarcane (IACSP95-5000) and two energy canes (Vertix 2 and Vertix 3) genotypes were cultivated under greenhouse conditions to evaluate the photosynthetic capacity of top leaves and to measure the actual photosynthesis of all green leaves of the main tiller. All genotypes showed similar maximum and actual photosynthesis in the top leaves, which was not correlated to their biomass production. In fact, the effects of leaf aging on canopy CO2 uptake, differential tillering and respiration rate seem to explain biomass production. IACSP95-5000 showed a sharp decrease in several photosynthetic traits and in abundance of key photosynthetic enzymes along the canopy profile, resulting in the lowest biomass yield. Vertix 2 and Vertix 3 exhibited a canopy with higher photochemical activity and lower variation in abundance of key photosynthetic enzymes with leaf aging as well as more well-developed tillers as compared with IACSP95-5000. Moreover, Vertix 2 – bred for high fiber content – exhibited a more homogeneous photosynthesis with leaf aging and higher growth respiration rate, two physiological traits associated with the highest biomass production among genotypes evaluated.

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