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| Study on Cross-compatibility Among the Three Subgenera of Rhododendron subgen. Tsutsusi, subgen. Azaleastrum and subgen. Pentanthera |
| GAO Jia-Jia1,2,3, XIAO Zheng1,2,3, DONG Bin1,2,3, ZHAO Hong-Bo1,2,3,* |
1 Zhejiang Provincial Key Laboratory of Germplasm Innovation and Utilization for Garden Plants, Zhejiang A&F University, Hangzhou 311300, China;
2 Key Laboratory of Germplasm Innovation and Utilization of Southern Landscape Plants, State Forestry and Grassland Administration, Zhejiang A&F University, Hangzhou 311300, China;
3 College of Landscape and Architecture, Zhejiang A&F University, Hangzhou 311300, China |
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Abstract Rhododendron resources are abundant in China and have a long history of cultivation. Hybridization breeding technology can greatly enrich Rhododendron resources. Rhododendron subgen. Tsutsusi, subgen. Azaleastrum and subgen. Pentanthera belong to the same evolutionary branch of hairy Rhododendron. In order to explore the compatibility of hybridization and the stages of hybridization barriers among 3 genus, Rhododendron simsii, R. pulchrum and 8 cultivars of subgen. Tsutsusi, R. ovatum of subgen. Azaleastrum, R. molle and 2 cultivars of subgen. Pentanthera were studied. The cross compatibility between subgenera was analyzed from the aspects of style length ratio, pollen germination, pollen tube growth, ovary and embryo development. The results showed that there was obvious prezygotic unidirectional discompatibility among subgen. Tsutsusi, subgen. Azaleastrum and subgen. Pentanthera. All pollen combinations could germinate in large quantities in stigma. The pollen tubes of subgen. Tsutsusi × subgen. Pentanthera, subgen. Azaleastrum × subgen. Pentanthera, and subgen. Azaleastrum × subgen. Tsutsusi reached the base of the style in large numbers and were able to set fruit. Reciprocal cross pollen tubes mostly stop growing in the middle of the style, a few reach the base of the style, and could not set fruit. The embryo development of subgen. Azaleastrum × subgen. Pentanthera and subgen. Azaleastrum × subgen. Tsutsusi were slower than that of subgen. Tsutsusi × subgen. Pentanthera, and the capsule dehiscent time was also late, most embryos of mature seeds in each hybridization direction were incomplete. The results of compatibility experiments showed that the cross barriers appeared in pollen tube growth, double fertilization and embryo development. The present study explored the law of cross compatibility and could provide reference for cross breeding of Rhododendron subgenera.
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Received: 04 April 2023
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Corresponding Authors:
*zhaohb@zafu.edu.cn
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