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Annals of Botany 91: 915-919, 2003
© 2003 Annals of Botany Company

Exogenously Applied Jasmonic Acid Induces Changes in Apical Meristem Morphology of Potato Stolons

ANA CENZANO1, ANA VIGLIOCCO1, TERESA KRAUS2 and GUILLERMINA ABDALA1

1 Departamento de Ciencias Naturales, Facultad de Ciencias Exactas, Universidad Nacional de Río Cuarto, 5800-Río Cuarto, Argentina and 2 Departamento de Biología Agrícola, Facultad de Agronomía y Veterinaria, Universidad Nacional de Río Cuarto, 5800-Río Cuarto, Argentina

* For correspondence. Fax +54 358 4676230, e-mail gabdala{at}exa.unrc.edu.ar

Received: 13 November 2002; Returned for revision: 15 January 2003; Accepted: 5 March 2003

Hooked apex stolons and initial swelling stolons of potato plants were treated with 3 x 10–8 mol l–1 jasmonic acid (JA) to study the effect of this compound on histology, cell expansion and tissue differentiation. In hooked apex stolons, JA application increased the meristem thickness and reduced the length of the leaf primordia, whereas in initial swelling stolons narrowing of the apical region, absence of leaf primordia and swelling of the subapical meristem were evident. Early vascular tissue differentiation was observed in response to JA treatment, especially of xylem elements from regions proximal to the tunic. Protoxylem elements, such as tracheal elements, were present with thin primary cell walls. The cell area was measured in two zones: zone I, central mother cells situated immediately under the tunic; and zone II, rib meristem cells. JA caused a four- and six-fold increase in cell area in both zones in hooked apex stolons and initial swelling stolons, respectively. Thus, tuber formation is concluded to occur as a consequence of increased cell expansion, a reduction in the length of leaf primordia, enlargement of meristems, and early vascular tissue differentiation.

Key words: Solanum tuberosum L., potato, stolons, jasmonic acid, cell expansion, tissue differentiation.


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