The role of the seed coat in the light sensivity in Raphanus sativus L. cv. redondo gigante seeds

Acta Botanica Brasilica

Maura Lúcia Costa Gonçalves¹  Massanori Takaki¹ 

[1] ,UNESP Departamento de Botânica Rio Claro SP ,Brasil

关键词: seed germination;    Raphanus sativus;    seed coat;    phytochrome;    germinação de sementes;    Raphanus sativus;    tegumento;    fitocromo;   

DOI  :  10.1590/S0102-33061997000100006

来源: SciELO

【 摘 要 】

The role of the seed coat in the light sensitivity of seeds of Raphanus sativus L. cv. redondo gigante was analysed by germination tests of intact and naked seeds. Far-red light caused high inhibition of seed germination, while under white and red lights low inhibition was found. Naked seeds presented no light sensitivity with high percentage germination under light and darkness. However, incubation of naked seeds in -0.6MPa polyethylene glycol solution resulted in light inhibition as observed in intact seeds. The analysis of the seed coat transmitted light indicated that the filtered light presented the same photoequilibrium of phytochrome when compared to the white light, with a decrease of only 33% in the light irradiance which reaches the embryo.

【 授权许可】

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