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The rhizome of nine species of the genus Xyris L. (Xyridaceae) was analyzed in order to present anatomical evidence that the primary thickening of the stem is a result of meristematic activity in both the endodermis and pericycle. The activity of these two tissues was verified by demonstrating that the pericycle gives rise to vascular tissues centripetally and that cell divisions take place in the endodermis and lead to the formation of the cortex centrifugally; both processes lead to the primary thickening of the rhizome. The existence of two tissues with meristematic activity instead of a single meristem (the primary thickening meristem) was shown from anatomical characteristics such as the arrangement of radial rows of cortical cells derived from the endodermis, the lignification of the endodermis and its continuity with both the adventitious roots and in the leaf traces in the later stages of development, and the noncorrespondence and the difference in size between the cells of the two tissues responsible for thickening primary in the younger stages.
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Dr. Graziela Cury easrned her undergraduate in Biology at the Universidade Presbiteriana Mackenzie in Sao Paulo, Brazil in 2000. Later the same year, she joined the Masters Degree Program at Universidade de Sao Paulo where studied wood anatomy of species from the Cerrado and Mata Atƒntica in the state of Sao Paulo. In 2004, she joined the Doctorate studies program, also at Universidade de Sao Paulo, focusing on underground organs of Asteraceae species from the Cerrados of the state of Sao Paulo. From 2009 to 2012 she was a Post Doctoral researcher with Dr. Nanunza Luiza de Menezes, studying anatomical and molecular aspects of the occurrence of the endodermis in stems of Xyris species from rocky fields of Serra do Cip¢ in Minas Gerais. In 2014 she became a professor at the Universidade Federal de Alagoas, Brazil, teaching the disciplines related to Plant Anatomy and Mophology. In the future, Graziela wants to study the Asteraceae species from Caatinga at the state of Alagoas. Graziela Cury's Author Page
Karen L. M. Sasaki Karen L. M. Sasaki's Author Page
Nanuza L. De Menezes Nanuza L. De Menezes's Author Page