Physical quality of seeds of Moquiniastrum polymorphum

Abstract This study aimed to analyze the physical properties of the seeds of Moquiniastrum polymorphum when processed by mini-SAS, X-ray and seed blower systems. The seeds were purchased from Seeds Caiçara, located in Penápolis-SP. After purchase, the seed lot was characterized by standard tests. In the X-ray test the seeds were classified according to their internal morphology as filled, unfilled or malformed. The seed blower was set at six opening settings, resulting in light and heavy fractions. The evaluations were performed by weighing the seeds that remained in the blower (heavy fraction) and by the amount of filled seeds indicated by the X-ray test. The germination tests were composed of four replicates of 50 seeds. The mini-SAS was used for external evaluation. It was concluded that the combined use of the seed blower and the X-ray test was efficient for the evaluation and determination of the physical quality of the seeds of M. polymorphum. The seed blower at opening settings 5 resulted in the best lot quality. The external parameters were not able to qualitatively evaluate the seeds of M. polymorphum.摘要 本研究旨在分析经mini-SAS、X射线（X-ray）成像及种子风选机处理后，多形莫奎尼亚草（Moquiniastrum polymorphum）种子的物理特性。试验所用种子购自位于巴西圣保罗州佩纳波利斯市的Seeds Caiçara公司。购得种子后，采用标准测试方法对该批次种子进行了品质表征。在X射线测试中，依据种子内部形态将其划分为饱满、空瘪或畸形三类。将种子风选机设置为6种开口档位，由此得到轻组分与重组分。评估通过称量风选机留存的种子（重组分）重量，以及结合X射线测试鉴定的饱满种子数量来完成。发芽试验设置4次重复，每组包含50粒种子。采用mini-SAS进行外部形态评估。研究结论表明，联合使用种子风选机与X射线测试可有效评估并测定多形莫奎尼亚草种子的物理品质。当种子风选机设置为5号开口档位时，该种子批次的品质最优。仅依靠外部形态参数无法对多形莫奎尼亚草种子进行定性评估。