Tropical flowers species of high commercial importance such as heliconia, if grown in semi-arid regions, can have their photosynthesis compromised and, consequently, flower production, due to high irradiation. Foliar applications of kaolin and the mineral nutrients boron and zinc may be an alternative for reducing the harmful effects of light stress. Thus, the objective of this study was to evaluate the effects of the application of these mitigating substances on physiological aspects in two species of heliconia grown under semi-arid conditions. The experimental design was randomized blocks in split-plot scheme, with four repetitions and four plants per replication. The plots consisted of two species of heliconias (H. psittacorum cv. Red Opal and H. bihai cv. Lobster Claw Two) and the subplots corresponded to three light stress mitigating substances (kaolin, boron + zinc, and control). The species H. psittacorum showed higher chlorophyll indexes, photosynthesis rate, stomatal conductance, and transpiration rate than the species H. bihai. The applications of kaolin and the mineral nutrients boron + zinc caused increases in the chlorophyll a and total chlorophyll indices, photosynthesis rate, carboxylation efficiency, effective quantum yield of photosystem II, leaf temperature, and vapor pressure deficit in plants of H. bihai and H. psittacorum. It is concluded that the foliar application of kaolin and the minerals boron and zinc reduce the harmful effects caused by high luminosity, with emphasis on the kaolin particle film, which promoted better photosynthetic performance and reduced the effects of non-stomatic limitation of photosynthesis, being a promising strategy for the cultivation of heliconia in semi-arid conditions. In addition, both kaolin and the minerals boron and zinc promote the production of flowering stems of heliconia with better quality and post-harvest durability.

如果在半干旱地区种植具有高度商业重要性的热带花卉物种，如葫芦属植物，由于高辐照，它们的光合作用可能会受到损害，从而影响花卉生产。叶面喷施高岭土和矿物质营养素硼和锌可能是减少光胁迫有害影响的替代方法。因此，本研究的目的是评估这些缓解物质的应用对在半干旱条件下生长的两种葫芦的生理方面的影响。实验设计是裂区方案中的随机区组，有四次重复，每次重复四株植物。这些地块由两种葫芦科植物组成（H. psittacorum cv. Red Opal 和H. bihai简历。Lobster Claw Two) 和子图对应于三种轻应力缓解物质（高岭土、硼 + 锌和对照）。H. psittacorum的叶绿素指标、光合速率、气孔导度和蒸腾速率均高于H. bihai。高岭土和矿质营养素硼+锌的施用导致碧海和H.植物的叶绿素a和总叶绿素指数、光合速率、羧化效率、光系统II有效量子产率、叶片温度和水汽压亏缺增加. 鹦鹉螺. 结论是叶面喷施高岭土和矿物质硼和锌减少了高光度造成的有害影响，重点是高岭土颗粒膜，促进了更好的光合性能并减少了光合作用的非气孔限制的影响，是在半干旱条件下种植葫芦属的有前途的策略。此外，高岭土和矿物质硼和锌促进了质量更好和收获后耐久性更好的葫芦花茎的生产。