Entry of water into the testa of hard seeds of Albizia lophantha (Willd.) Benth. is controlled by a small strophiolar plug (0.3 × 0.25 mm), adjacent to the hilum, which is lost by eruption after heating. Movement of water through the testa is facilitated by the vascular bundle which arches close to the strophiole. Each seed imbibes 90 to 110 μl of water. This water enters the testa with an average flux of 165 μl/mm2/hr. Development of the testa is described with particular relevance to the strophiolar plug and associated tissues.
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B. Dell (1980) studied this question.
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