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Trees

, Volume 16, Issue 4–5, pp 338–345 | Cite as

Functional anatomy of the secondary xylem of roots of the mangrove Laguncularia racemosa (L.) Gaertn. (Combretaceae)

  • Guillermo Angeles
  • Jorge López–Portillo
  • Fernando Ortega-Escalona
Original Article

Abstract.

We describe the secondary xylem anatomy of three types of roots produced by Laguncularia racemosa (cable roots, pneumatophores and pneumathodes). Formation of lateral roots (pneumathodes) by pneumatophores causes structural modifications in their secondary xylem, like circular vessels, which may have consequences for water transport. These modifications are not found in the secondary xylem of cable roots. The path followed by water in the secondary xylem of cable roots and pneumatophores was established by infusion with safranin and by mold-casting with polystyrene. Hydraulic (k h) and specific (k s) conductivity of the different root types was also determined. We found that the circular vessels at the junctions did not impair k h or k s values under well-watered conditions, but perhaps the junctions limit water loss when the air-exposed pneumatophores dry out.

Pneumatophores Pneumathodes Circular vessel lines Water transport 

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Copyright information

© Springer-Verlag 2002

Authors and Affiliations

  • Guillermo Angeles
    • 1
  • Jorge López–Portillo
    • 2
  • Fernando Ortega-Escalona
    • 1
  1. 1.Instituto de Ecología, A.C. Depto. de Productos Forestales y Conservación de Bosques, Apdo. Postal 63, Km. 2.5 Antigua Carretera a Coatepec, Xalapa, Veracruz, C.P. 91070, Mexico
  2. 2.Instituto de Ecología, A.C. Depto. de Ecología Vegetal, Apdo. Postal 63, Km. 2.5 Antigua Carretera a Coatepec, Xalapa, Veracruz, C.P. 91070, Mexico

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