Emergência e crescimento de plântulas de cártamo em função do estresse hídrico na planta mãe

Abstract

Belonging to the family asteraceae safflower (Carthamus tinctorius L.) is an annual plant, herbaceous, with origins in Asia and Africa. The spread of this kind is performed by seed, which are used as raw material for the extraction of oil which has excellent quality. The germination of seeds of safflower is classified as epigeal and the seedling phanerocotylar. Seed germination and seedling emergence is a process influenced by several factors such as temperature, physical characteristics of soil moisture, planting depth and oxygen availability. Thus objective of this work was to evaluate the effects of duration of water stress, deficit and excess in the quality of seeds of safflower. The completely randomized design was implemented using mother plants whose seeds were submitted to different durations of water stress. We used four treatments in duration of excess water (0 (no stress), 5, 10 and 15 days) and four water deficit (0 (no stress), 5, 10 and 15 days) with five replicates each.. It was determined the percentage of emergence, speed of emergence and seedling height. Water stress in mother plants interfered in the emergence and seedling growth of safflower, and the durations of stress 10 and 15 days for both deficit and for water logging were the most significant.