Stimulus to rooting of Saccharum sp. mini-cuttings with talc indole-butyric acid

Janniffer Custódio Da Silva,Aurélio Rubio Neto,Camila Vilela Vasconcelos,Paula Fabiane Martins,Ana Cristina Lourenço De Souza,Fabiano Guimarães Silva

doi:10.33448/rsd-v10i7.16239

Janniffer Custódio Da Silva, Aurélio Rubio Neto + Show 4 more

Open Access

https://doi.org/10.33448/rsd-v10i7.16239

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Abstract

Sugarcane is a commercially important species for sugar and biofuel production and because of the high demand for plant material in planting, new means of propagation are being developed and require improvements. Therefore, the objective of this study was to evaluate the effect of different concentrations of indole-butyric acid (IBA) applied in the form of talc on the initial growth and emergence of sugarcane mini-cuttings used for the system of pre-sprouted plantlets (PSP). Mini-cuttings were treated with concentrations of 0, 500, 1000, 1500 and 2000 mg kg-1 of IBA in the form of talc and evaluated for emergence and initial growth. There was no difference between IBA concentrations for the physiological, biometric and dry mass variables analyzed. The sugarcane plantlets formed had emergence above 89%, functional photosynthetic apparatus, 4.4 leaves on average, stem diameter of 11.90 mm, shoot length of 12.18 cm, leaf area of 108.81 cm² and root area of 142.17 cm². Shoot dry mass and root dry mass were equal to 2.27 and 1.20 grams, respectively. Thus, concentrations of up to 2000 mg kg-1 of IBA applied in the form of talc in sugarcane mini-cuttings had no effect on rooting and initial growth of plantlets.

Highlights

Sugarcane has proven to be a crop of global interest due to its capacity for bioenergy production (Guo et al 2015)
The system of pre-sprouted plantlets (PSP) of sugarcane is a new planting technique that proposes the formation of healthy plantlets that will be taken to the field with a high standard of health and homogeneity
There was no difference between indole-butyric acid (IBA) concentrations for emergence percentage and emergence speed index (ESI), which had averages of 89.9% and 1.4, respectively (Figure 1)

Summary

Introduction

Sugarcane has proven to be a crop of global interest due to its capacity for bioenergy production (Guo et al 2015). The processing of sugarcane for ethanol and sugar production generates several by-products that can be used as fertilizers, textile fiber, bioenergy, animal feed, among others (Sindhu et al 2016) It is clear the importance of optimizing sugarcane yield in order to meet the demands for products, and this increase in yield can be achieved with proper management of the crop. The technique proposes the use of mini-cuttings, a region of the stem with an approximately 3-cm-long bud, for plantlet formation It is feasible, because it reduces the planting material from on average 20 t ha-1 to 2 t ha-1 and contemplates the uniformity and use of smaller machines for planting (Landell et al 2013). For being a recent technique, few studies have been conducted to improve this plantlet production system, so research aimed at reducing nursery time and optimizing this technique is needed

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