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Rooting and morpho-anatomy of Odontonema strictum kuntze (Acanthaceae) stem cuttings.


Odontonema strictum Kuntze, a commonly cultivated shrub in Brazil, has red flowers grouped in inflorescences and can reach two meters high. The objective of this work was to study the root formation and morpho-anatomy of herbaceous cuttings of Odontonema strictum. The cuttings were planted in conical polyethylene container with vermiculite of fine granulometry and coconut coat powder. The experiment was conducted in a greenhouse at the Federal University of Paraná, Curitiba, Brazil. The cuttings were 12 cm long with two leaves cut by half in the apical portion. The experimental design used was a completely randomized with 4 replications of 10 cuttings each one. After 44 days, the root formation was 100% on the two studied growing media. The vermiculite presented the higher number of roots per cutting (22,49 roots) while the coconut coat powder presented the higher average of root size per cutting (11,67 cm). Anatomically, the cuttings of O. strictum presented unisseriate epidermis, with thick walls; cortex composed by collenchyma, parenchyma, and endodermis with casparian strips; central cylinder in secondary state of growth, having pericycle with isolated groups of fibers, active cambium and medular parenchyma. The probable origin of adventitious roots is the peripheral phloem cells. The results indicate that the anatomical characteristics of the cuttings do not block the formation of adventitious roots, having no mechanical tissue on the cortex. This species has easy root formation and there is no need of plant growth regulator application.



ISSN: 2447-536X

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