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Breaking physical dormancy of Cassia leptophylla and Senna macranthera (Fabaceae: Caesalpinioideae) seeds: water absorption and alternating temperatures

Published online by Cambridge University Press:  26 July 2012

Alexandre Souza de Paula ,
Carolina Maria Luzia Delgado ,
Maria Terezinha Silveira Paulilo  and
Marisa Santos
Alexandre Souza de Paula
Affiliation:
Departamento de Botânica, Universidade Federal de Santa Catarina, Florianópolis88040-900, Brazil
Carolina Maria Luzia Delgado
Affiliation:
Departamento de Botânica, Universidade Federal de Santa Catarina, Florianópolis88040-900, Brazil
Maria Terezinha Silveira Paulilo
Affiliation:
Departamento de Botânica, Universidade Federal de Santa Catarina, Florianópolis88040-900, Brazil
Marisa Santos*
Affiliation:
Departamento de Botânica, Universidade Federal de Santa Catarina, Florianópolis88040-900, Brazil
*
*Correspondence Email: marint@mbox1.ufsc.br
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Abstract

This study analysed the anatomical structure of the seed coats, identified the location of water uptake and evaluated the effects of alternating temperatures and heat treatment on the breaking of physical dormancy of two species of Fabaceae (Caesalpinioideae), Cassia leptophylla and Senna macranthera, from the Atlantic forest of Brazil. The seed coats of both species consisted of a cuticle (extra-hilar region) or remaining funicle region (hilar region), subcuticular layer, palisade layer with lignin, osteosclereids, sclerified parenchyma and white cells. The palisade layer was formed by elongated macrosclereids with a light line of callose. In thermally scarified seeds of C. leptophylla, water entered through the micropylar canal, and in S. macranthera the water entered through the lens. Alternating temperatures that ranged from 15 to 30°C did not break physical dormancy of either species; however, exposure to 50°C broke seed hardcoatedness, allowing the entrance of water in both species.

Keywords

Fabaceaehardcoatednesslensphysical dormancywater intake

Information

Type
Research Papers
Information
Seed Science Research , Volume 22 , Issue 4 , December 2012 , pp. 259 - 267
Copyright
Copyright © Cambridge University Press 2012

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