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<p>To promote the application of China’s native wild <i>Rhododendron</i> resources in cross-breeding endeavors, we collected 54 distinct <i>Rhododendron</i> species spanning 6 subgenera. Among these, 10 species served as female parents for both intersubgeneric and intrasubgeneric hybridizations. A total of 135 hybrid combinations were used to analyze the cross-compatibility of <i>Rhododendron</i>. During the intersubgeneric hybridization process involving subgenera <i>Tsutsusi</i>, <i>Azaleastrum</i>, and <i>Hymenanthes</i> as the parental lines, the frequency of ovary expansion exceeded 50%. However, the fruit setting frequency of subgenus <i>Hymenanthes</i> was below 50%. The germination frequency of the hybrid groups using subgenus <i>Azaleastrum</i> as the female parent was consistently higher than that observed in other hybrid groups. Highly fertile combinations were discovered in intragenus hybridization of subgenera <i>Tsutsusi</i>, <i>Azaleastrum</i>, and <i>Hymenanthes</i>. Crossing subgenus <i>Tsutsusi</i> hybrid groups with various varieties was conducive to fertility. Conversely, hybridization between subgenus <i>Pentanthera</i> and section <i>Pentanthera</i> yielded fertile seeds and successful germination. Regarding section <i>Choniastrum</i>, which belongs to subgenus <i>Azaleastrum</i>, the compatibility observed was higher within section than between different sections. The examination of ovary morphological alterations 60–90 d post-pollination revealed no significant variation in ovary size among hybrid combinations involving subgenus <i>Pentanthera</i> or <i>Tsutsusi</i> as the female parent. A limited number of these combinations exhibited a significant reduction in length and width during this period, subsequently leading to a decrease in seed quantity at a later stage. Using subgenus <i>Azaleastrum</i> as the female parent group, despite no significant change in ovary morphology at this stage, the hybrid seed production increased at a later stage.</p>

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Cross-compatibility in RhododendronL.

  • 期刊论文

  • 发表日期：

    2025年4月15日

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  • Peiting Zhao,
  • Fanyu Zeng,
  • Xingmin Geng,
  • Yuchen Liu,
  • Jinliang Zhou,
  • Jing Sun

摘要

To promote the application of China’s native wild Rhododendron resources in cross-breeding endeavors, we collected 54 distinct Rhododendron species spanning 6 subgenera. Among these, 10 species served as female parents for both intersubgeneric and intrasubgeneric hybridizations. A total of 135 hybrid combinations were used to analyze the cross-compatibility of Rhododendron. During the intersubgeneric hybridization process involving subgenera Tsutsusi, Azaleastrum, and Hymenanthes as the parental lines, the frequency of ovary expansion exceeded 50%. However, the fruit setting frequency of subgenus Hymenanthes was below 50%. The germination frequency of the hybrid groups using subgenus Azaleastrum as the female parent was consistently higher than that observed in other hybrid groups. Highly fertile combinations were discovered in intragenus hybridization of subgenera Tsutsusi, Azaleastrum, and Hymenanthes. Crossing subgenus Tsutsusi hybrid groups with various varieties was conducive to fertility. Conversely, hybridization between subgenus Pentanthera and section Pentanthera yielded fertile seeds and successful germination. Regarding section Choniastrum, which belongs to subgenus Azaleastrum, the compatibility observed was higher within section than between different sections. The examination of ovary morphological alterations 60–90 d post-pollination revealed no significant variation in ovary size among hybrid combinations involving subgenus Pentanthera or Tsutsusi as the female parent. A limited number of these combinations exhibited a significant reduction in length and width during this period, subsequently leading to a decrease in seed quantity at a later stage. Using subgenus Azaleastrum as the female parent group, despite no significant change in ovary morphology at this stage, the hybrid seed production increased at a later stage.