INFLUENCE OF SEED STORAGE CONDITIONS ON QUALITY OF Torresea acreana SEEDLINGS

ABSTRACT The plant vigor defined in the laboratory may not indicate the final quality of seedlings produced under nursery conditions, or even their survival in plantations. So, we evaluated the influence of the storage conditions of Torresea acreana seeds on its emergence, as well as, on the morphological quality of produced seedlings. Seeds were collected in October/2011, packed, transported, conditioned in closed glas pots and stored in three environments for a period of 462 days. The treatments consisted of seedlings produced from seeds: 1 - without storage (control), 2 - stored in a dry chamber, 3 - stored in a humid chamber, and 4 - stored in an uncontrolled environment (laboratory). Sowing was performed in 50 cm³ plastic tubes filled with decomposed pine bark and coconut fiber (50/50 v/v) which were packed in a glasshouse. The study analyzed the percentage of emergence, mean seedlings emergence time, stem diameter, total height, ratio between total height and stem diameter, shoot length, mean root length, total dry biomass, root dry biomass, shoot dry biomass, and Dickson quality index. Seed storage proved to be a negative factor for the emergence and vigor of T. acreana seedlings. The vigor of the seeds is a preponderant factor to increase the morphological quality of the seedlings.

摘要
实验室测定的植物活力，未必能反映苗圃培育条件下幼苗的最终品质，更无法体现其在种植园中的存活情况。为此，本研究探究了Torresea acreana种子的贮藏条件对其出苗率及所育幼苗形态品质的影响。试验种子于2011年10月采集，经包装、运输后置于密闭玻璃容器中，在三种环境下贮藏462天。试验共设置4组处理：1. 未经贮藏的对照组；2. 干燥贮藏箱组；3. 湿润贮藏箱组；4. 非受控环境（实验室）贮藏组。播种采用体积为50 cm³的塑料试管，基质为腐熟松树皮与椰糠按体积比50:50混合而成，所有试管均放置于温室中。本研究测定的指标包括：出苗率、平均出苗时间、茎粗、株高、株高与茎粗之比、地上部长度、平均根长、总干生物量、根干生物量、地上部干生物量以及狄金森品质指数（Dickson Quality Index）。结果表明，种子贮藏对T. acreana幼苗的出苗率与活力存在负面影响；种子活力是提升幼苗形态品质的关键主导因素。