docAbstract: 11 Topic: Germination Key Author: Massanori Takaki
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Abstract: Topic: Key Author: Correspondence Address: E-mail: Authors: 11 Germination Massanori Takaki Departamento de Botânica, UNESP, CP199, 13506-900 Rio Claro, SP Brazil [email protected] V. Y. Sugahara and M. Takaki Effect of light and temperature on seed germination in guava (Psidium guajava L. - Myrtaceae) Page 759-764 The germination of seeds of Psidium guajava L. (Myrtaceae) is controlled by phytochrome. Guava seeds can germinate with at least one hour per day of irradiation of high red:far-red ratio light preceeded or followed by shade light, indicating that phytochrome B controls germination in these conditions. Under alternating temperatures, in a range of at least 5 C, seeds will germinate in darkness, suggesting that in gaps of the canopy, when seeds are covered by a thin layer of soil they will germinate once the alternating temperatures are experienced. Under these conditions phytochrome A is responsible for the control of guava seed germination.
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