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The film-forming antitranspirant, di-1- p -menthene, is able to reduce transpiration in a number of crops, potentially resulting in water savings and improved productivity. The success of the response is, however, dependent on genotype and environmental factors. We aimed to assess the efficacy of this natural terpene polymer on red raspberry ( Rubus idaeus , L.) cv. Tulameen leaf water-use efficiency across a 25-40 °C temperature range under controlled conditions. The film reduced transpiration ( E ) and was most effective when applied to the lower leaf surface. Leaf net assimilation ( A ) and stomatal conductance ( g ) were also curtailed after the application of di-1- p -menthene, and as a consequence intrinsic transpiration efficiency ( A/g ) and instantaneous transpiration efficiency (ratio of net carbon fixation to water loss, A/E ) did not improve. At 40 °C, gas exchange of both treated and untreated leaves was minimal due to stomatal closure. The antitranspirant was effective at reducing water loss from berries, but only at the immature stages when transpiration rates were naturally high. Further studies are required to determine if the antitranspirant, di-1- p -menthene, will offer protection against dehydration across a range of temperatures and if productivity and berry composition will benefit.

Characterizing the Efficacy of a Film-Forming Antitranspirant on Raspberry Foliar and Fruit Transpiration