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Germination of scarified dormant seeds of Townsville stylo (Stylosanthes humilis) is very low in Petri dishes, but may be appreciable in sealed Erlenmeyer flasks if ethylene accumulates in their atmospheres. When ethylene in the flask atmosphere was fixed by a mercuric perchlorate solution, emanation of the gaseous regulator and germination of dormant seeds were drastically decreased. On the other hand, ethylene produced by dormant seeds and accumulated in the flask atmosphere led to a further enhancement of ethylene accumulation and a corresponding increased seed germination. Germination of both dormant and non-dormant seeds did not occur when ethylene biosynthesis was completely blocked. A germinação de sementes dormentes escarificadas de estilosante (Stylosanthes humilis) é muito baixa em placas de Petri, mas pode ser considerável em frascos de Erlenmeyer selados devido a um acúmulo de etileno em sua atmosfera. Quando esse etileno foi adsorvido por solução de perclorato de mercúrio, a emanação do regulador gasoso das sementes dormentes e sua germinação foram drasticamente diminuídas. O etileno produzido pelas sementes dormentes, ao difundir-se na atmosfera dos frascos, promoveu maior acúmulo do próprio gás e um correspondente aumento da germinação. Sementes dormentes e não-dormentes não germinaram quando a biossíntese do regulador foi completamente bloqueada

Germination of dormant seeds of Stylosanthes humilis as promoted by ethylene accumulation in closed environments