Light interception and conversion efficiencies and biomass partitioning in sugarcane varieties with varying canopy architecture under subtropical conditions

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dc.citation.journaltitleFIELD CROPS RESEARCH
dc.creatorMARTINS, T. S.
dc.creatorMAGALHÃES FILHO, J.R.
dc.creatorCRUZ, L. P.
dc.creatorALMEIDA, R. l.
dc.creatorMARCHIORI, P. E. R.
dc.creatorSILVA, A. L. B. O.
dc.creatorPIRES, R. C. M.
dc.creatorLANDELL, M. G. A.
dc.creatorXAVIER, M. A.
dc.creatorMACHADO, E. C.
dc.creatorRIBEIRO, R. V.
dc.date.accessioned2026-05-05T17:56:53Z
dc.date.issued2025
dc.description.resumoContext: Crop yield is determined by available solar energy and crop efficiency in intercepting light and converting such energy into biomass. However, such processes remain poorly understood in field-grown sugarcane under subtropical conditions. Objective: We aimed to estimate the efficiencies underlying crop yield in four sugarcane varieties with varying canopy architecture, revealing the genotypic variation and how environmental conditions affect the light interception efficiency (?i), light conversion efficiency (?c) and partitioning efficiency (?p). Methods: Classical growth analysis and measurements of incident and transmitted light through sugarcane canopies and leaf nitrogen content were done along the crop cycle. At harvest, technological analyses were performed in stalks, and cane and sugar yields were determined for IACSP95–5000 and IACSP94–2094 (planophile-like canopy), IACSP94–2101 and SP79–1011 (erectophile-like canopy) varieties. IACSP95–5000 and IACSP94–2101 are responsive to water availability and present high yield, while IACSP94–2094 and SP79–1011 are drought-resistant and recommended for limiting environments. Results: Planophile-like varieties exhibited higher ?i compared to erectophile-like ones, with the latter ones showing ?i below 0.8. The highest ?i was noticed in IACSP95–5000, reaching 0.9. Conversely, the highest ?c of 0.097?J?J?1 was found in IACSP94–2101, an erectophile-like variety. All varieties exhibited decreased ?c under water deficit and low temperature, which happened during the winter season. Additionally, low leaf nitrogen content was found to contribute to low ?c in IACSP95–5000 and IACSP94–2101. Reductions in ?c were associated with the phenomenon of reduced growth, for the first time reported in Brazilian varieties. There were no differences in ?p among sugarcane varieties, ranging from 0.86 to 0.88. However, the sugar yields of IACSP95–5000, IACSP94–2101 and IACSP94–2094 were higher than one found for SP79–1011. Notably and despite IACSP94–2101 having the highest ?c, its sugar yield was comparable to that of IACSP95–5000, which exhibited the highest ?i. Conclusions: Both ?i and ?c determined sugarcane yield, with high ?i compensating low ?c and vice-versa in varieties differing in canopy architecture. Erectophile-like varieties improved light distribution within the canopy, but planophile-like varieties exhibited superior canopy development and light interception. IACSP95–5000, IACSP94–2101, and IACSP94–2094 achieved higher sugar yields compared to SP79–1011, which was caused by higher leaf expansion, growth rate, ?i, and ?c. Implications: As high ?i and ?c determine high sugar and biomass yields and vary among sugarcane varieties under subtropical conditions, such efficiencies would be targets for sugarcane breeding. Additionally, reducing row spacing could increase energy capture and improve yield, particularly for erectophile-like varieties such as IACSP94–2101.
dc.format.extent109724
dc.format.issue322
dc.identifier.citationTamires S. Martins, José R. Magalhães Filho, Larissa P. Cruz, Rafael L. Almeida, Paulo E.R. Marchiori, André L.B.O. Silva, Regina C.M. Pires, Marcos G.A. Landell, Mauro A. Xavier, Eduardo C. Machado, Rafael V. Ribeiro, Light interception and conversion efficiencies and biomass partitioning in sugarcane varieties with varying canopy architecture under subtropical conditions, Field Crops Research, Volume 322, 2025, 109724, ISSN 0378-4290, https://doi.org/10.1016/j.fcr.2024.109724.
dc.identifier.doihttp://dx.doi.org/10.1016/j.fcr.2024.109724
dc.identifier.urihttps://repositorio.iac.sp.gov.br/handle/iac/68
dc.subjectCrop yield, Growth analysis, Light conversion efficiency, Light interception efficiency, Partitioning efficiency, Photosynthesis, Saccharum spp
dc.titleLight interception and conversion efficiencies and biomass partitioning in sugarcane varieties with varying canopy architecture under subtropical conditions

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