Anatomical Characteristics of the Seed-Integument observed on 10 Species of Eucalyptus

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1) Seeds of 10 species of Eucalyptus contain mostly crystals of oxalate of lime, oil and tannin in seed-integument and we find them more in the inner-integument than the outer one. 2) The sclerenchymatous cells in outer-integument are lignified, and colour reaction by reagent is recognized, namely these become vellow, yellow brown or brown in colour by nitric acid or caustic potash solution and deep brown in colour by jodjodpotassium. 3) Though integument-cells of 10 species of Eucalyptus are not dyed by eosin and congored, they are dyed well by colouring materials of safranin and methylenblue, the former dying them red and the latter blue. 4) Seeds of E. ficifolia and E. globulus are relatively large grains among those of 10 species of Eucalyptus and each of the two entirely is different from the other in shape and outwardly colour, the former consisting of parenchymatous cells in outer-integument, latter of decomposed cells, and the cells left undecomposed represent tiny trichome on the surface of seed. 5) The seeds of E. fastigata and E. glgantea have mutual resemblance in size and shape, outer-integument of each species consisting of two kinds of sclerenchymatous cells, the former is of larger longer cells and of larger roundish polygonal ones at the horizontal section, but the latter of rather roundish polygonal cells and rather squarish polygonal ones. 6) Seeds of E. pauciflora and E. pilularis are like each other in size and shape, the former consisting of somewhat irregular polygonal scleren- chymatous cells with relatively wide cell-lumen at the horizontal section, but the latter of larger cells with remarkably sclerenchymatous cell- membrane. 7) The seeds of E. robust a and E. rostrata resemble each other in shape, but the former has brown stripes of net-work on the surface of seed, with the decomposed state of cells in outer-integument distinctly discernible at the cross section, but the outer-integument of E. rostrata consists of long larger and rather sclerenchymatous cells, each cell having membrane with many pits in it at the horizontal section, and each cells being semicircle and arranged in a row at the cross section of outer-integument. 8) The seeds of E. botryoides and E. tercticornis resemble each other in shape, and each has black stripes on the surface of seed representing network sound and regular in the latter and far less sound and regular in the former, the cells left undecomposed are found at the cross section of the seeds of each species, but those of E. botryoides are larger in shape than those of E. tereticornis, and the decomposed cells seem to be dissolved. 9) I think that the structure of seed-integument of the 10 species is closely related to the resisting character to the cold of the young plants germinated from these seeds.
九州大学の論文

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原田盛重
九州大学農学部

Anatomical Characteristics of the Seed-Integument observed on 10 Species of Eucalyptus

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