首页|Palynological and macroscopic characters evidence infer the evolutionary history and insight into pollination adaptation in Impatiens(Balsaminaceae)

Palynological and macroscopic characters evidence infer the evolutionary history and insight into pollination adaptation in Impatiens(Balsaminaceae)

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The genus Impatiens comprises more than 1000 species and displays enormous morphological diversity.As a taxon that is notoriously difficult to classify morphologically,the taxonomic significance of pollen morphology has been discussed in previous studies.However,there was only limited study on the evolution of palynological and macroscopic character in this genus before.In this paper,we observed pollen of 143 species of Impatiens,including all representatives of infrageneric groups and discussed their taxonomic value.Meanwhile,based on the reconstructed phylogenetic framework,we selected five pollen traits,and nine macroscopic traits including both vegetative and reproductive organs for evolutionary analysis.The character reconstruction showed that the morphology and number of aperture,granules in lumina,seed number of per capsule,number of sepals,lateral united petals connate,spur length,and phyllotaxy could be identified as unambiguous,while other characters were ambiguous in the last common ancestor of Impatiens.The results of comprehensively macroscopic characters and palynological evidence suggest that these traits experienced a complicated evolution,exhibit high levels of instability and variability and occur character multiple reversals in the evolutionary processes of Impatiens due to different selection pressures.In addition,we found that there is an evident mosaic evolution in this genus.Pollen and macroscopic character are conserved with a slower evolutionary rate in the I.subgen.Clavicarpa,however,these characters showed higher diversity with a rapid rate of evolution in the I.subgen.Impatiens.Furthermore,the relationship between floral morphology and pollinators was discussed.

character evolutionImpatienspalynologypollinationtaxonomy

Yong-Xiu Song、Tian Hu、Shuai Peng、Yi-Yan Cong、Guang-Wan Hu

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College of Life Sciences,Hunan Normal University,Changsha 410081,China

CAS Key Laboratory of Plant Germplasm Enhancement and Specialty Agriculture/Core Botanical Gardens,Wuhan Botanical Garden,Chinese Academy of Sciences,Wuhan 430074,China

College of Life Sciences,Sichuan University,Chengdu 610064,China

Sino-Africa Joint Research Center,Chinese Academy of Sciences,Wuhan 430074,China

University of Chinese Academy of Sciences,Beijing 100049,China

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National Science &Technology Fundamental Resources Investigation Program of ChinaSecond Tibetan Plateau Scientific Expedition and Research Program(STEP)国家自然科学基金

2019FY1018002019QZKK050231970211

2024

10.1111/jse.12959

植物分类学报
中国科学院植物研究所　中国植物学会

植物分类学报

CSTPCD
影响因子：0.322
ISSN：1674-4918
年,卷(期)：2024.62(3)
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