Four strains of Kappaphycus spp. (viz. K. alvarezii—tambalang brown and green, K. striatus—sacol green) and K. malesianus (aring-aring) were grown in Semporna, Sabah, for three consecutive growth cycles from August 2018 to January 2019, each for a duration of 45 days. The study was established in order to determine the impacts of a commercially produced phyco-stimulant: Ascophyllum marine plant extract powder, enhanced with potassium (i.e., AMPEP K⁺) on micropropagated Kappaphycus strains on the mean daily growth rate (DGR), quality characteristics of extracted, refined carrageenan from the harvested biomass (i.e., yield, viscosity, and gel strength), and the percentage incidence of the damaging, endophytic Neosiphonia apiculata, while in open water cultivation. Results showed that the AMPEP K⁺-treated thalli were significantly different (P < 0.01), in terms of the three major assessment criteria used in this study. Amongst the four cultivars, and under the conditions tested, K. striatus was the most resistant to the incidence of N. apiculata, particularly when treated with AMPEP K⁺. The use of the brown seaweed-derived extract, as a phyco-stimulant, applied to a commercially cultivated, red seaweed for the promotion of thallus growth, reduction of biotic stress caused by endophytes, and important improvements to commercially valuable traits, such as carrageenan quality, are encouraging. It is recommended that these protocols should be adopted in crop management to assist the Malaysian seaweed industry.

四个Kappaphycus spp菌株。（即卡帕藻-tambalang棕色和绿色，K.纹-sacol绿色）和K. malesianus（aring-aring）在仙本那，沙巴生长，为三个连续的生长周期从2018八月2019一月，每一个用于一个持续45天。该研究建立，以确定工业生产的Phyco对于兴奋剂的影响：泡叶海洋植物提取物粉末，用钾（即，AMPEPķ增强⁺）上微量繁殖Kappaphycus在开阔水域中，评估平均日生长速率（DGR），从收获的生物质中提取的精制角叉菜胶的质量特征（即产量，粘度和凝胶强度），以及破坏性内生新鞭毛虫的百分比发生率培养。结果表明，就 本研究中使用的三个主要评估标准而言，经AMPEP K ⁺处理的拟南芥显着不同（P <0.01）。在这四个品种中，在所测试的条件下，条状K. striatus对尖头猪笼草的发生最有抵抗力，尤其是在用AMPEP K ⁺处理时。褐藻提取物作为植物刺激剂的用途，用于商业种植的红藻，以促进菌体生长，减少内生菌引起的生物胁迫以及对商业上有价值的特征（例如角叉菜胶）的重要改进质量，令人鼓舞。建议在作物管理中采用这些协议，以协助马来西亚海藻产业。