Germination of Psidium friedrichsthalianum (O. Berg) Nied. seeds under different temperature and storage conditions

Abstract: Psidium friedrichsthalianum is a species whose fruit can be used to make juices, jellies/jams and sweets, and its seedlings serve as rootstocks with resistance to Meloidogyne spp. The aim of this study was to evaluate the performance of seeds of this species at different germination temperatures, and to verify the effects of different moisture levels on their storage in two experiments. In the first, six germination temperatures (15, 20, 25, 30, 35, and 40 ºC) were evaluated, and in the second, seeds with different moisture levels (15.4, 9.8, 9.0, 8.4, and 8.2%) were stored in sealed containers at 20 °C for 0, 1, 3, 6, 9, and 12 months. Seed germination was favored by temperatures of 20 ºC and 25 ºC, reaching 93% and 87%, respectively, along with the highest germination speed indexes (2.582% day1 and 2.568% day-1) and shortest germination times (37.9 and 36.9 days). Temperatures of 30 °C and 35 °C maintained the seeds quiescent, while 40 °C was lethal. In storage, the seeds tolerated desiccation to 8.2% moisture content and could be stored in sealed containers at 20 ºC for 12 months, with germination higher than 70%.摘要：弗雷泽氏番樱桃（Psidium friedrichsthalianum）是一种可利用其果实制作果汁、果冻/果酱与甜食的物种，其实生苗可作为抗根结线虫属（Meloidogyne spp.）植物的砧木使用。本研究通过两组试验，旨在评估该物种种子在不同萌发温度下的表现，并验证不同含水量对其贮藏特性的影响。第一组试验设置了6个萌发温度梯度（15、20、25、30、35和40 ℃）；第二组试验则将不同含水量（15.4%、9.8%、9.0%、8.4%和8.2%）的种子置于密封容器中，于20 ℃条件下分别贮藏0、1、3、6、9和12个月。结果显示，20 ℃与25 ℃的温度条件最利于种子萌发，萌发率分别可达93%与87%，同时具备最高的萌发速率指数（2.582%·d⁻¹与2.568%·d⁻¹）以及最短的萌发时长（37.9天与36.9天）；30 ℃与35 ℃会使种子维持休眠状态，而40 ℃则会导致种子失活。贮藏试验表明，该种子可耐受脱水至8.2%的含水量，且可在20 ℃的密封容器中贮藏12个月，此时种子萌发率仍高于70%。