Plant and Cell Physiology 47: 864-877 (2006)

Endosperm-limited Brassicaceae seed germination: Abscisic acid inhibits embryo-induced endosperm weakening of Lepidium sativum (cress) and endosperm rupture of cress and Arabidopsis thaliana

Kerstin Müller, Stefanie Tintelnot, Gerhard Leubner-Metzger

Institut für Biologie II (Botanik/Pflanzenphysiologie), Albert-Ludwigs-Universität Freiburg, Schänzlestr. 1, D-79104 Freiburg i. Br., Germany, Web: 'The Seed Biology Place'

Received April 3, 2006; accepted May 3, 2006

Lepidium sativum seed

Figure 1. 
Structure of a mature seed of Lepidium sativum. Bright field microscopy of longitudinal sections of 2-3 h imbibed seeds stained with toluidine blue. (A) Entire seed, showing the mature and fully differentiated embryo, the endosperm, and the testa (seed coat). The boxed letters refer to the positions of the close-up sections. (B) Structure of the seed covering layers: Endosperm, a single cell layer; and testa (seed coat), composed of inner and outer integument. Note that the mucilage is generated from the outer testa upon imbibition. (C) Structure of the micropylar cap enclosing the radicle tip. The micropylar endosperm has 1-2 cell layers. (D) Structure of the chalazal seed region. Blue light filter (C,D); Differential contrast (D); Size bars are given for each panel.

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   Abstract    Fig. 1               Fig. 2
Fig. 5               Fig. 6
Fig. 3               Fig. 4
Fig. 7               Table 1
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