BACKGROUND:Earlier planting under subtropical climatic conditions has been proposed as a means of increasing strawberry (Fragaria×ananassa Duch.) profitability but exposes transplants to heat stress. OBJECTIVE:Therefore, physical and chemical methods of ameliorating heat stress on the establishment, growth, and yield of containerized strawberry transplants were evaluated. METHODS:We used a split-plot design with white-on-black (white) mulch and black mulch as main plot treatments; and a factorial arrangement of transplant type and stress-prevention application was randomly assigned to the subplots. ‘Florida Radiance’ Jiffy plug and tray plug transplants were treated either with s-abscisic acid or with kaolin. RESULTS:White mulch resulted in greater plant vigor and vegetative growth than black mulch. Kaolin plus white mulch provided protection against heat stress as indicated by increased photosynthesis rates. At 4 weeks after transplanting, plant vigor and shoot growth were higher and flowering occurred earlier with Jiffy plug transplants than with tray plug transplants. Early marketable yields were higher with white mulch than with black mulch in three of the four site years. CONCLUSIONS:A combination of white mulch, Jiffy plug transplants, and kaolin application appears to have the best potential for alleviating heat stress during early-season strawberry establishment under subtropical conditions.

中文翻译：

---

减轻容器化草莓移植早期建立期间的热应激

背景：在亚热带气候条件下提前种植已被提议作为提高草莓 (Fragaria × annassa Duch.) 盈利能力的一种手段，但会使移植物暴露于热应激下。【摘要】：目的:对改善热胁迫对草莓移栽建立、生长和产量的影响的物理和化学方法进行评价。方法：采用裂地设计，以白底黑（白）地膜和黑色地膜为主要小区处理；并且将移植类型和应激预防应用的因子排列随机分配到子地块。'Florida Radiance' Jiffy 插头和托盘插头移植物用 s-脱落酸或高岭土处理。结果：白色覆盖物比黑色覆盖物产生更大的植物活力和营养生长。高岭土加白色覆盖物提供了防止热应激的保护，如光合作用速率增加所示。在移植后 4 周，Jiffy 插秧移植的植物活力和枝条生长更高，开花比托盘插秧更早。在四个场地年份中的三年中，白色覆盖物的早期可销售产量高于黑色覆盖物。结论：在亚热带条件下，白色覆盖、快速插秧和高岭土应用的组合似乎最有可能减轻草莓早熟期的热应激。在四个场地年份中的三年中，白色覆盖物的早期可销售产量高于黑色覆盖物。结论：在亚热带条件下，白色覆盖、快速插秧和高岭土应用的组合似乎最有可能减轻草莓早熟期的热应激。在四个场地年份中的三年中，白色覆盖物的早期可销售产量高于黑色覆盖物。结论：在亚热带条件下，白色覆盖、快速插秧和高岭土应用的组合似乎最有可能减轻草莓早熟期的热应激。