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      Description of a new natural Sonneratia hybrid from Hainan Island, China

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      PhytoKeys

      Pensoft Publishers

      Sonneratia , new hybrid, Dongzhai Harbour, Hainan Island

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          Abstract

          Here, we describe, illustrate and compare a new natural hybrid, Sonneratia × zhongcairongii Y. S. Wang & S. H. Shi ( Sonneratiaceae ), with its possible parent species. Based on its morphological characteristics and habitat conditions, this taxon is considered to represent a sterile hybrid between S. alba and S. apetala. In China, the new hybrid is only reported in the mangrove forest in Dongzhai Harbour, Hainan Island. It has intermediate characteristics with its parents by elliptical leaf blades, peltate stigma, terminal or axillary inflorescence with 1–3 flower dichasia, cup – shaped calyx (4–6 calyx lobes) and no petals. We also provide a key for the identification of Sonneratia species.

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          Most cited references 16

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          Factors Influencing Biodiversity and Distributional Gradients in Mangroves

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            Molecular criteria for determining new hybrid species--an application to the Sonneratia hybrids.

            The possible hybrid origin of new species can usually be corroborated by molecular means. Here, we suggest that the segregation patterns of the molecular markers be further analyzed. A true hybrid species should show the patterns under continuous breeding among its members, at least beyond the F2 generation. We applied the guidelines to the putative hybrid species of Sonneratia, a widespread mangrove genus, and concluded that all the observed hybrids in this genus are simple F1's. Thus, S. x gulngai and S. x hainanensis are not true hybrid species. The segregation patterns of molecular markers should be heeded in interpreting the existence of hybrid species.
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              Testing a hypothesis of unidirectional hybridization in plants: Observations on Sonneratia, Bruguiera and Ligularia

              Background When natural hybridization occurs at sites where the hybridizing species differ in abundance, the pollen load delivered to the rare species should be predominantly from the common species. Previous authors have therefore proposed a hypothesis on the direction of hybridization: interspecific hybrids are more likely to have the female parent from the rare species and the male parent from the common species. We wish to test this hypothesis using data of plant hybridizations both from our own experimentation and from the literature. Results By examining the maternally inherited chloroplast DNA of 6 cases of F1 hybridization from four genera of plants, we infer unidirectional hybridization in most cases. In all 5 cases where the relative abundance of the parental species deviates from parity, however, the direction is predominantly in the direction opposite of the prediction based strictly on numerical abundance. Conclusion Our results show that the observed direction of hybridization is almost always opposite of the predicted direction based on the relative abundance of the hybridizing species. Several alternative hypotheses, including unidirectional postmating isolation and reinforcement of premating isolation, were discussed.
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                Author and article information

                Contributors
                Journal
                PhytoKeys
                PhytoKeys
                3
                urn:lsid:arphahub.com:pub:F7FCE910-8E78-573F-9C77-7788555F8AAD
                PhytoKeys
                Pensoft Publishers
                1314-2011
                1314-2003
                2020
                03 August 2020
                : 154
                : 1-9
                Affiliations
                [1 ] Life Science and Technology School, Lingnan Normal University, Zhanjiang, Guangdong 524048, China Hainan Academy of Forestry, Hainan Mangrove Research Institute Haikou China
                [2 ] Hainan Academy of Forestry, Hainan Mangrove Research Institute. Haikou, Hainan, 571100, China Shaoguan University Shaoguan China
                [3 ] College of Ying-Tong Agricultural Science and Engineering, Shaoguan University, Shaoguan, Guangdong 512005, China Lingnan Normal University Zhanjiang China
                Author notes
                Corresponding author: Ying Zhang ( zhangyingred@ 123456lingnan.edu.cn )

                Academic editor: Hanno Schaefer

                Article
                53223
                10.3897/phytokeys.154.53223
                7417295
                Cairong Zhong, Donglin Li, Ying Zhang

                This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

                Categories
                Short Communication
                Lythraceae
                Taxonomy
                Asia

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