揭开热带木竹交配系统的神秘面纱 | BMC Plant Biology  
 

论文标题：Mixed mating system and variable mating patterns in tropical woody bamboos

期刊：BMC Plant Biology

作者：Ning Xie, Ling-Na Chen et.al

发表时间：2019/10/11

数字识别码：10.1186/s12870-019-2024-3

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目前，木质竹的交配系统仍然十分神秘，但是通过对亲本的分析能极大地增进对这些系统的认识，并有助于木质竹的种质保存和遗传改良。最新发表于开放获取期刊BMC Plant Biology的Mixed mating system and variable mating patterns in tropical woody bamboos为我们揭开了热带木竹的交配系统的神秘面纱。

图1

来自中国林业科学研究院资源昆虫研究所的研究人员发现，使用基于简单重复序列（SSR）标志物的COLONY程序，对来自黄竹林（Dendrocalamus membranaceus）和巨龙竹（D. sinicus）的两个连续的群体或零星开花事件的后代进行亲本分析，从而确定其交配系统和花粉散布方式。此项研究结果显示巨龙竹的两个零星开花种群（C1，C2）的亲权分配率较高（69.0%-71.4%）。同时，在黄竹林的三个种群中，零星开花种群A的亲权分配率（56.4%）也远高于群体开花种群B1（28.6%）和B2（42.5%）。黄竹林和巨龙竹均具有混合交配系统，但其交配方式因授粉条件的不同而不同。黄竹林和巨龙竹种群的最大花粉扩散距离分别为90 m和4378 m，并且其交配距离分别集中在ca. 0-50m和0-1500m范围。

这一篇发表于BMC Plant Biology的研究成果首次揭示了木质竹多变的交配方式，即来自同一竹丛的半同胞种子可能具有不同的父本，因此在木质竹的育种计划中明确其遗传起源至关重要。该研究结果还强调了传粉媒介在热带木竹交配系统中的重要性并对日后木质竹的种质保存和遗传改良提出了建议。

图2

BMC Plant Biology is an open access, peer-reviewed journal that considers articles on all aspects of plant biology, including molecular, cellular, tissue, organ and whole organism research.

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摘要：

Background

So far, little is known in detail about mating systems of woody bamboos. Paternity analysis of offspring improved our understanding of these systems, and contributed to their germplasm conservation and genetic improvement.

Results

In this study, a paternity analysis of offspring from two consecutive mass or sporadically flowering events of Dendrocalamus membranaceus and D. sinicuswere conducted to determine their mating system and pollen dispersal using the program COLONY based on simple sequence repeat (SSR) markers. Two sporadically flowering populations of D. sinicus (C1, C2) obtained relatively high paternity assignments rates (69.0–71.4%). Meanwhile, among three populations of D. membranaceus, the sporadically flowering population A also had much higher paternity assignments rates (56.4%) than mass flowering populations B1(28.6%) and B2 (42.5%). Both D. membranaceus and D. sinicushad mixed mating systems while their mating patterns were variable depending on pollination conditions. The maximum pollen dispersal distances were 90 m and 4378 m for D. membranaceus and D. sinicuspopulations, respectively, and the mating distances of these two species focused on ranges of ca. 0–50 m and 0–1500 m, respectively.

Conclusions

These results revealed for the first time variable mating patterns in woody bamboos. This suggests half-sib seeds from the same bamboo clump may have different male parents and it is crucial to clarify genetic origin in woody bamboos’ breeding programs. The results also indicate the importance of pollinators in the mating systems of tropical woody bamboos.

（来源：科学网）

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