Abstract
ABSTRACT During the in vitro multiplication of bamboo plantlets, it is common the formation of shoots aggregates. Once individualized, these can yield a greater number of plantlets than if planted in clusters. This study aimed to evaluate the effect of the relationship between height and number of initial shoots in micropropagated bamboo plantlets on the survival and development of plants, during the pre-acclimatization stage. Guadua aff. chaparensis shoots, after successive subcultures of in vitro multiplication, were classified into three height classes (2.5-5.0 cm; 5.1-10.0 cm; 10.1-15.0 cm) and number of aggregate shoots (one shoot per plantlet/single-stem plantlet, two and three shoots per plantlet) and pre-acclimatized in a commercial substrate composition plus washed sand. The plantlets were evaluated for survival, height, number of new shoots and roots, shoot and root fresh and dry mass. In plantlets from micropropagation, the plant height does not influence the survival rates, being acclimatized preferably at heights between 5.0 cm and 15.0 cm, with survival rates of up to 97 %. Plantlets with height starting at 5.1 cm and composed of 2 or 3 initial shoots show a greater vigor and ex vitro growth, a fact evidenced by the higher values obtained in relation to height and emission of new shoots and roots, as well as a greater fresh and dry biomass accumulation.
Highlights
Brazil has a favorable climate and vast territory, including degraded areas considered unsuitable for agriculture, but suitable for the planting of bamboo species of commercial value, which could make the nation a major producer and worldwide exporter of this raw material
Due to the low volume of information on the factors that influence the acclimatization of micropropagated bamboo plantlets, this study aimed to evaluate the effect of the relationship between height and number of initial shoots in micropropagated bamboo plantlets (Guadua aff. chaparensis) on the survival and development of plants, during the pre-acclimatization stage
The only significant likelihood ratio test was the Test 1, which considers the comparison of the Y~1 model, without predictor variables, with the Y~B model, that considers the number of initial shoots per plant
Summary
Brazil has a favorable climate and vast territory, including degraded areas considered unsuitable for agriculture, but suitable for the planting of bamboo species of commercial value, which could make the nation a major producer and worldwide exporter of this raw material. It is essential to advance research and development programs with technologies capable of generating a scientific knowledge that ensures technological innovation, sustainability and potentialization of the use of native and planted bamboo, which represent an innovative and interesting alternative to the Brazilian. Despite the versatility of uses and the potential of bamboo as a raw material, an important limitation for the development of the production chain of this plant refers to the slow and deficient vegetative multiplication process. The bamboo flowering, which is generally a rare phenomenon and, depending on the species, may occur after decades (Ramanayake 2006, Lin et al 2010, Zhao et al 2015) and exhibit a low seed viability, hinders its sexual propagation
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