Swietenia macrophylla yields high-quality wood; however, its vulnerability to extinction coupled with challenges for its cultivation have brought attention to its replacement for alternative species such as the Khaya anthotheca. The species has been recently introduced to South America, with potential for the production of high-quality wood. However, limited background on breeding and efficient strategies for its vegetative propagation exist. Here, we achieved significant results with the application of cleft grafting and air layering for the propagation of K. anthotheca plants grown from seeds. First, we analyzed the compatibility of scions and rootstocks for intraspecific and interspecific cleft grafting combinations of K. anthotheca and S. macrophylla. Second, air layering was performed in K. anthotheca seedlings irrigated with three nutrient solution (100%, 50% and 25% of the initial concentration of nutrients) combined with the application of indole-3-butyric acid (IBA) to evaluate adventitious rooting. From cleft grafting, we achieved an overall graft compatibility and survival of 48% after 200 days. However, the interspecific combination of S. macrophylla (scion) and K. anthotheca (rootstock) implicated in no compatibility, while the reciprocal resulted in 52% of compatibility. Through air layering, the irrigation with the nutrient solution with at least 50% of the nutrients concentration and with IBA (3.0 or 8.0 g.L-1) resulted in the best adventitious rooting. Overall, we recommend cleft grafting, except for the combination S. macrophylla (scion) and K. anthotheca (rootstock), with no compatibility. Air layering might also be useful for the propagation of K. anthotheca genotypes in breeding programs.
The Tectona grandis L.f. (teak) is an important forest species with high economy value in Asia, Africa, and Latin America. In Latin America, Brazil is one of the countries with the most cultivated areas. The cultivation of teak turns out to be challenging because of its high nutritional demand and the need for seedling production by clonal propagation that includes about 90 days in the nursery phase. The optimization of seedling production is necessary for better results in the nursery and to enhance growth in the field. In this way, the well-known advantage of using microorganisms that promote plant development appears as a potential biotechnological approach to be explored and for the implantation of new areas of wood production. In this study, the inoculation of Bacillus subtilis as plant growth-promoting rhizobacteria (PGPR) was evaluated, and Rhizophagus clarus, an arbuscular mycorrhizal fungus (AMF), and the co-inoculation of these microorganisms in the teak seedling production phase can improve the development of commercial plantations under field conditions. Experiments were carried out under greenhouse and field conditions to evaluate four treatments based on the substrate inoculation of the seedlings. Treatments consisted of a non-inoculated control, PGPR inoculation, AMF inoculation, and PGPR + AMF inoculation. The results of the biometric evaluation of seedlings in the greenhouse showed that there was a significant difference in AMF inoculation and PGPR + AMF inoculation in terms of the specific root length and root density treatments, there was also a positive correlation between these two treatments and the absorption of some nutrients, such as P, N, K, Mg, Cu, Mn, and Zn. This response led to an increase between 4.75 and 11.04% in the field growth rate.
RESUMO:Este trabalho teve por objetivo quantificar a produção de miniestacas por minicepas de Eucalyptus urophylla em relação às coletas de brotações e concentrações de solução nutritiva. As brotações originaram-se de minicepas seminais, cultivadas em vasos plásticos de 3,0 L com aberturas na parte inferior com substrato composto por areia, fração fina e fertirrigadas de solução nutritiva em três concentrações: 25, 75 e 100% sendo realizada 6 coletas ao longo do tempo. A produção de miniestacas foi conduzida a partir do delineamento em blocos casualizados com arranjo fatorial (3x6) e parcelas subdivididas no tempo, sendo os fatores constituídos por solução nutritiva (S1 -100%, S2 -75%, S3 -25%) e coleta de brotos (6 coletas), de acordo com a produtividade. A produção de miniestacas por metro quadrado ano (NM) variou significativamente em relação à solução nutritiva e as coletas de brotações e os resultados apresentaram oscilações ao longo das seis coletas. A solução de 100% e a 6ª coleta obtiveram a maior produção de NM.Palavras-chave: minijardim clonal, miniestaquia, propagação vegetativa.Productivity of mini stumps of Eucalyptus urophylla S. T. Blake on different nutritional solutions and collection of sprouts ABSTRACT: This work aimed to quantify the production of mini stakes by mini stumps of Eucalyptus urophylla in relation to the collection of sprouts and concentrations of nutritive solution. The sprouts were originated from seminal mini stumps, cultivated in plastic pots capable to store 3.0 L, with openings at the bottom, with substrate composed of sand, thin layer, and fertigated with nutritive solution in three concentrations: 25, 75 and 100%, with the accomplishment of 6 collections over time. The production of mini stakes was conducted from a randomized block design with factorial arrangement (3x6) and plots subdivided in the time, with the factors being formed by nutritive solution (S1 -100%, S2 -75%, S3 -25%) and collection of sprouts (6 collections), according to productivity. The annual production of mini stakes per square meter (NM) has significantly varied in relation to the nutritive solution, and the collections of sprouts and the results have shown oscillations over the six collections. The 100% solution and the 6th collection have obtained the greatest production of NM.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.