Abstract
Hortensias (Hydrangea macrophylla L.) are well known as ornamental plants with their impressive flowers. Besides being an ornamental plant, some hortensia species contain constituents of nutritional and pharmaceutical interest. In this context, H. macrophylla subsp. serrata contains dihydroisocoumarins (DHCs), in particular hydrangenol (HG) and phyllodulcin (PD), which determine produce quality. For the successful cultivation of H. macrophylla subsp. serrata, shading may be required. The response of H. macrophylla subsp. serrata as a source for DHCs was investigated in two growing seasons using three different cultivars (‘Amagi Amacha’, ‘Oamacha’ and ‘Odoriko Amacha’) under three different light conditions: no shade (100% photosynthetic active radiation, PAR), partial (72% PAR) and full shading (36% PAR). The shading regimes had no significant effect on dihydroisocoumarin content in leaf dry matter in each single cultivar. However, ‘Amagi Amacha’ and ‘Oamacha’ yielded significantly higher PD content in comparison to ‘Odoriko Amacha’, which showed, in contrast, the significantly highest HG content. The total biomass was not significantly affected by the shading regime, but slightly higher biomass was observed under partially shaded and full-shade conditions. Hyperspectral vegetation indices (VIs) and color measurements indicate less vital plants under no shade conditions. While lighting is an important growth factor for hortensia production, DHC is cultivar dependent.
Highlights
IntroductionThe nomenclature of Hydrangea was revised by McClintok, as the genus Hydrangea can be found around the world, from eastern Asia to northern America as well as tropical regions on the northern and southern hemispheres
The response of H. macrophylla subsp. serrata as a source for DHCs was investigated in two growing seasons using three different cultivars (‘Amagi Amacha’, ‘Oamacha’ and ‘Odoriko Amacha’) under three different light conditions: no shade (100% photosynthetic active radiation, PAR), partial (72% PAR) and full shading (36% PAR)
Hydrangea macrophylla subsp. serrata originates in Japan, where it is used as Amacha, a sweet-tasting tea in rituals surrounding ceremonies on the birthday of the Buddha, Hanamatsuri in Japanese [1]
Summary
The nomenclature of Hydrangea was revised by McClintok, as the genus Hydrangea can be found around the world, from eastern Asia to northern America as well as tropical regions on the northern and southern hemispheres Adding to this spreading of Hydrangea in connection to a multitude of different cultivars has led to a confusion in the nomenclature [5]. This revision concluded 23 species in the genus of Hydrangea. One of these is H. macrophylla subsp. H. serrata is used frequently in scientific writings (e.g., [10,11,12,13,14,15]) and for convenience [6,9]
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