Abstract
Sugarcane is a very important crop in tropical areas around the world. Optimizing the light intensity and culture vessel for sugarcane in vitro propagation can improve protocols for large-scale in vitro mass clonal propagation. The objective of this study was to evaluate biometric and anatomical characteristics of in vitro propagated sugarcane plantlets using different light intensities and culture vessel types. The study also aimed to stimulate desired photoautotrophic and/or photomixotrophic traits and to study correlations between survival and ex vitro vigor with in vitro data. Fluorescent lights at 70 μmol m−2 s−1 and light-emitting diodes (LEDs) at 120 and 200 μmol m−2 s−1 were used combined with different culture vessel types, including microboxes without a filter, microboxes with a filter, and baby food jars. Propagation and rooting growth were observed in all in vitro culture conditions. However, an increase in light intensity and change of culture vessel type provided improved results. When sugarcane plantlets were cultivated within microboxes with a filter under 120 and 200 μmol m−2 s−1, they showed improved growth, increased chlorophyll content, the lowest leaf yellowing percentage, an increase in bulliform cells and, consequently, increased leaf thickness under in vitro culture. After 60 d in greenhouse conditions, in vitro-derived plantlets under LEDs and microbox culture vessels showed the highest biometric values and high ex vitro survival.
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Acknowledgements
We also thank Florida Crystals for providing the initial sugarcane in vitro cultures for this study.
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The Tropical Research and Education Center (TREC) of the University of Florida and Goiano Federal Institute-Campus Rio Verde (IF Goiano) provided the financial support of this study, and the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES, Brazil) provided the scholarship. This project was supported by the Florida Agricultural Experiment Station.
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Editor: Marco Buenrostro-Nava
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Neto, A.R., Chagas, E.A., Costa, B.N.S. et al. Photomixotrophic growth response of sugarcane in vitro plantlets using different light intensities and culture vessel types. In Vitro Cell.Dev.Biol.-Plant 56, 504–514 (2020). https://doi.org/10.1007/s11627-020-10057-0
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DOI: https://doi.org/10.1007/s11627-020-10057-0