Germination of Styrax camporum Pohl. seeds in response to substrate types, moisture contents and the seed morphology

Anais da Academia Brasileira de Ciências

Edson Simão¹  Adriana T. Nakamura¹  Massanori Takaki¹ 

关键词: cerrado;    water stress;    morphophysiology;    Styracaceae;    vermiculite;    cerrado;    estresse hídrico;    morfofisiologia;    Styracaceae;    vermiculita;   

DOI  :  10.1590/S0001-37652013005000015

来源: SciELO

【 摘 要 】

This study evaluated the contributions of Styrax camporum seed morphology (size of seeds, presence or absence of endocarp attached to the seed), different substrates (filter paper, vermiculite, sand and the soils of cerrado s. str., cerradão and a riparian forest), different water potentials (0, -0.1, -0.2, -0.3, -0.4 and -0.5 MPa), light and temperature to seed germination. Seed size did not affect the germination percentage when seeds were sown on vermiculite. Seeds were affected by small variations in the moisture content of the tested substrates, showing a significant decrease in germination under water potentials lower than -0.1 MPa, close to the field capacity of cerrado s. str. soils. At the temperatures of 15 and 20°C, a significant decrease in germination was observed. Thus, the availability of water in cerrado soils associated to temperature modulate the distribution of germination in this species. Seed morphology contributes to the maintenance of seeds in the soil, and the lack of synchrony in seed germination spreads the distribution of germination in time. These peculiarities allow the emergency of seedlings at different time periods and establishment conditions, an adaptative response of S. camporum to the cerrado environment.

【 授权许可】

CC BY   
 All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License