The last step of the ethylene biosynthesis pathway in turnip tops (Brassica rapa) seeds: Alterations related to development and germination and its inhibition during desiccation.

摘要: The involvement of ethylene in zygotic embryogenesis is a little known aspect the growth and development higher plants. In present work, we study alterations last step biosynthesis pathway during formation period turnip tops (Brassica rapa cv. Rapa) seeds its repercussions germination process post-germinative growth. For this, chose 11 different phases silique development, first being recently fertilized pistil just prior to dehiscence (ca. 2 months post-anthesis). phases, production was detected both whole (with or without seeds) enclosed by wall. levels ACC, ACO proved high belonging to: (1) pod very early when were growing but photosynthetic competence; (2) at maximum growth, which will initiate desiccation loss activity. During dehiscence, there marked inhibition pathway. viable dry seeds, no activity ACC 4-fold lower than onset senescence. Germination brings about net synthesis with respect stores seed. This fact, together other results presented this point towards, as dependence for radicle emergence. possible role played wall control embryogenesis, well participation hormonal signal triggering seed Brassica Rapa, are discussed depth.