Índices morfo-fisiológicos para crescimento, acúmulo de açúcares e fibras em cana-de-açúcar
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2018-04-27
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Universidade Federal de Goiás
Resumo
The aim of this work was to determine the most predictive parameters for
sugar and fiber yield in sugarcane in the first crop cycle (cane plant), from an
experimental population consisting of clones in earlier and later stages of
genetic breeding, including, in the latter, some commercial varieties. The
parameters here studied included biometric index data, physiological indices,
and quantitative and qualitative data for soluble and insoluble sugars (fibers)
of the stem. The canes (74 clones) were evaluated at 180, 240 and 300 days
after transplanting (DAT). The following biometric indices were determined:
number of leaves, length (Co) and width (l) of leaves, fresh mass (MS), dry
mass (MS), stem diameter (D), mean plant height (A) and number of tillers
(NP). The physiological indexes were leaf area (AF), total chlorophyll content
(CT), leaf area index (IAF), net assimilation rate (TAL) and relative growth
rate (TCR). Technological analyzes included sucrose content (P), soluble solids
content (B), purity (Q), reducing sugars (AR), total recoverable sugars (ATR),
stem weight (PCOL), broth weight (PCAL), broth volume (V) and fiber content
(F). The higher positive correlations were found among the following
parameters: PCOL-PCAL, PCOL-V, PCAL-V e ATR-B, with correlation
coefficients of 0,985; 0,980; 0,991 e 0,905, respectively. The higher negative
correlation was among the following parameters AR-Q with correlation
coefficient of -0,999. The principal component analysis revealed that two
components explained 41,5% of all data variation. The best model of multiple
linear regression analysis fit culm diameter as independent variable with 30%
accuracy at the best prediction. Understanding the response pathways that
determine the plant architecture and constitution will help to uncover the best
strategies for breeding sugarcane toward a growing global demand of sugars
for food and biofuels.
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MITSUZONO, S. T. Índices morfo-fisiológicos para crescimento, acúmulo de açúcares e fibras em cana-de-açúcar. 2018. 91 f. Dissertação (Mestrado em Genética e Melhoramento de Plantas) - Universidade Federal de Goiás, Goiânia, 2018.