New records of pollen tube shower in species of Bertolonia (Melastomataceae) suggest that autogamy may be the rule in the genus

New records of pollen tube shower in species of Bertolonia (Melastomataceae) suggest that autogamy may be the rule in the genus
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Bertolonia(野牡丹科)物种花粉管簇射的新记录表明,自花受精可能是该属的规则

DOI:
10.1007/s00606-022-01829-9
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发表时间:
2022
影响因子:
1.9
通讯作者:
Maia, Fabiano Rodrigo
Maia, Fabiano Rodrigo
中科院分区:
生物学3区
文献类型:
--
作者:
Passos, Luan Salles;Goldenberg, Renato;Bacci, Lucas F.;Telles, Francismeire Jane;Maia, Fabiano Rodrigo

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以往的分子系统发育分析表明,巴西大西洋森林特有属Bertolonia(野牡丹科)有35种,在物种分布和一些花卉性状上表现出很强的相关性。相同的分析表明,所有物种都属于3个支系:Marmorata(主要分布于AF北部)、Formosa(仅分布于AF中部)和Nymphaeifolia(主要分布于AF南部)。一种罕见的延迟自交机制,即花粉管簇射(PTS),最近在裸子叶科的两种植物中被描述,然而,这种机制也可能普遍存在于其他支系的物种中。在这里,我们调查了PTS在该属的另外两个物种中的潜在发生:B.Vioracea(Marmorata Clade)和B.金莲花(Nymphaeifolia Clade)。我们还调查了物种以及标本馆标本,寻找可能表明在其他贝托洛尼亚种中存在自主自交机制的花特征的潜在证据。两个都是。紫罗兰A和B。尖叶植物通过PTS产生种子。我们还观察了来自两个不同物种的两种枯萎病菌的PTS的发生:斑点拟青霉(B.maculata(Marmorata Clade))和贝托洛尼亚斯(Bertoloniasp)。该属所有分支的分类学数据表明,该属没有异花受精、花后花瓣关闭和花托上花冠持续的现象,所有这些特征都与PTS的发生有关。我们在这里提供了经验证据和对花特征的描述,表明白花属主要是自交的,这是野牡丹科的一个不常见的特征。
Previous molecular phylogenetic analyses showed thatBertolonia(Melastomataceae), an endemic genus to the Brazilian Atlantic Forest (AF) with 35 species, presents a strong correlation regarding species distribution and some floral traits. The same analyses showed that all species belong to three clades: marmorata (species mostly distributed in northern AF), formosa (species only occurring in central AF), and nymphaeifolia (species mostly distributed in southern AF). A rare delayed selfing mechanism, the pollen tube shower (PTS), was recently described for two species in the nymphaeifolia clade; however, this mechanism may also be prevalent in species of the other clades. Here, we investigated the potential occurrence of PTS in two other species of the genus:B. violacea(marmorata clade) andB. acuminata(nymphaeifolia clade). We also investigated species, as well as herbarium specimens, searching for potential evidence of floral traits that could suggest the presence of an autonomous selfing mechanism in otherBertoloniaspecies. BothB. violaceaandB. acuminataproduced seeds through PTS. We also observed the occurrence of PTS in two exsiccates from two different species:B. maculata(marmorata clade) andBertoloniasp. Taxonomic data across all clades of the genus indicate the absence of herkogamy, presence of post-anthesis petal closure and corolla persistence on the floral receptacle, all traits associated with the occurrence of PTS. We present here empirical evidence and descriptions of floral traits that indicate that the genusBertoloniais predominantly autogamous, an uncommon characteristic in Melastomataceae.
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