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1 Acta Biologica Cracoviensia. Series Botanica

1 2006

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Structure of Phaseolus lunatus testa at its central point

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Aniszewski T. , Karttunen A. L. , Hyvarinen H.

Acta Biologica Cracoviensia. Series Botanica

2006

tom 48

nr 1

In the Phaseolus lunatus seed, the strata and cells of the testa at the central point of the vertical side are described. The proposed regionalization and the central point technique makes it possible to define precisely each site in the testa. Exo-, meso- and endotesta are found to be basic strata in the central point studied. The exotesta is divided into cuticle, palisade and crushed cell layers. The cuticle layer is irregular and noncellular. The palisade cells are exoepidermal sclerenchyma and the crushed cells are former exoepidermal cells. The mesotesta is composed of hourglass cells, called stapes cells here because their form resembles stapes, and crushed cells. The stapes cells are parenchyma. The endotesta is composed of support tissue, three crushed cell layers, phloem, xylem and testa bottom. The endotesta adjoins the cotyledon.