A rose by any other name: Researchers cultivate rose petal calluses as alternative fragrance source

Researchers cultivate rose petal calluses as alternative fragrance source

This study was conducted by a team from Floriculture Research Division, National Institute of Horticultural and Herbal Science (NIHHS), Rural Development Administration (RDA).

Calluses were cultivated from the petals of the Rosa hybrida​ breeding line, 15R-12-2. This breeding line was developed by the NIHHS, RDA and is known for its strong fragrance.

An analysis revealed the presence of thirty components, encompassing various esters and alcohols, in the petal-derived callus.

Notably, a significant amount (59.01%) of 2-ethylhexan-1-ol, the same volatile organic compound (VOC) found in the petals was found.

Additionally, compounds previously undetected in petals, were identified in the calluses. This included hexanal, which imparts a fresh grass scent, and 6-methylhept-5-en-2-one, which emits a “tangerine-like lemongrass scent”.

The study suggested that callus could potentially be an alternative source of obtaining VOCs.

“Callus containing these VOCs is expected to have a high value in the industry and can be proposed as an alternative pathway to obtaining volatile organic compounds.”

Callus cultivation

The calluses were cultivated over four weeks culturing the petal explants in a medium in darkness.

Callus formation was more robust in the fully open flowers (FOF) stage compared to the partially open flower (POF) stage. FOF petals also exhibited lower browning rate.

According to the paper, the white rose breeding line 15R-12-2 proved effective in mitigating browning and inducing callus formation due to its superior antioxidant capacity, particularly evident in the FOF petals compared to those of the POF stage.

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