Study on crossing compatibility and seeding propagation of 5 Rhododendron species in Sect. Ponticum
LI Xiaohua1， Tong Jun2， WANG Kaihong1， LI Dandan1， SHAN Wen1， WANG Zhaohong1， ZHANG Lehua1
1.Lushan Botanical Garden， Jiangxi Province and Chinese Academy of Sciences， Lushan， Jiangxi 332900， China；2.Academy of Agricultural Sciences， Wuhan 430065， China
Abstract：Using 5 Rhododendron species from 4 subsections of Sect. Ponticum of genus Rhododendron in Lushan Botanical Garden as materials， including Subsect. Fortunea， Subsect. Auriculata， Subsect. Argyrophylla and Subsect. Arborea， we conducted an interspecific hybridization experiment with six cross combinations， to study the compatibility within this section. The reproducibility and discipline of interspecific hybridization were analyzed and discussed， with the fruit setting rate， 1000-seed weight， germination rate and green seedling rate as the evaluation indexes. The results were as follows. 1) The fruit setting rate of the interspecific hybridization among R. Sect. Ponticum species was 57.14%-88.89%. 2) The thousand-seed weight from the fruits of hybridization was lower than that from the female parent's natural fruits， while only the seeds of the R. jinggangshanicum ♀×R. denudatum ♂ reached a significant level. 3) The germination rate of hybrid seeds is mostly higher than that of their female parent's natural seeds. Some “super affinity” phenomenon were showed， however， there were some differences among different cross combinations. 4) The green seedling rate of some cross combinations were significantly lower than that of the female parent， indicating the hybrid weakness. 5) The comprehensive fertility evaluation scores of six cross combinations reach 8-10 points， and all of them reached high fertility level. It's concluded that the interspecific hybridizations of R. Sect. Ponticum have high fertility. This result provided a basis for the future cross breeding of R. Sect. Ponticum.
李晓花,童 俊,王凯红,李丹丹,单 文,王兆红,张乐华. 5种常绿杜鹃组杜鹃杂交亲和性及播种繁殖研究[J]. 华中师范大学学报(自然科学版), 2020, 54(6): 990-997.
LI Xiaohua,Tong Jun,WANG Kaihong,LI Dandan,SHAN Wen,WANG Zhaohong,ZHANG Lehua. Study on crossing compatibility and seeding propagation of 5 Rhododendron species in Sect. Ponticum. journal1, 2020, 54(6): 990-997.
2020, Vol. 54 
