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Article|23 Sep 2021|OPEN
Morphological studies of rose prickles provide new insights
Ningning Zhou1,3,, Fabienne Simonneau2, Tatiana Thouroude3, Laurence Hibrand-Saint Oyant3 & Fabrice Foucher3,
1National Engineering Research Center for Ornamental Horticulture; Flower Research Institute (FRI), Yunnan Academy of Agricultural Sciences, Kunming 650231, China
2Univ Angers, INRAE, SFR QUASAV, F-49000 Angers, France
3Univ Angers, Institut Agro, INRAE, IRHS, SFR QUASAV, F-49000 Angers, France

Horticulture Research 8,
Article number: 221 (2021)
doi: 10.1038/hortres.2021.221
Views: 66

Received: 28 May 2021
Revised: 07 Jul 2021
Accepted: 13 Jul 2021
Published online: 23 Sep 2021

Abstract

Prickles are common structures in plants that play a key role in defense against herbivores. In the Rosa genus, prickles are widely present with great diversity in terms of form and density. For cut rose production, prickles represent an important issue, as they can damage the flower and injure workers. Our objectives were to precisely describe the types of prickles that exist in roses, their tissues of origin and their development. We performed a detailed histological analysis of prickle initiation and development in a rose F1 population. Based on the prickle investigation of 110 roses, we proposed the first categorization of prickles in the Rosa genus. They are mainly divided into two categories, nonglandular prickles (NGPs) and glandular prickles (GPs), and subcategories were defined based on the presence/absence of hairs and branches. We demonstrated that NGPs and GPs both originate from multiple cells of the ground meristem beneath the protoderm. For GPs, the gland cells originate from the protoderm of the GP at the early developmental stage. Our findings clearly demonstrate that prickles are not modified trichomes (which originate from the protoderm). These conclusions are different from the current mainstream hypothesis. These results provide a foundation for further studies on prickle initiation and development in plants.