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自我不相容性是交配物种杂交的繁殖障碍吗?

Linda M Martínez-Ramos^1,2, Sonia Vázquez-Santana³, José García-Franco⁴

¹Instituto de Ecología, Universidad Nacional Autónoma de México (UNAM), Ciudad de México, México.

American journal of botany

|April 8, 2024

概括

在Opuntia cantabrigiensis中,自我不相容性作为一种繁殖障碍,防止杂交. 其他Opuntia物种表现出不同程度的兼容性,与自我兼容的物种产生杂交种子.

科学领域:

生态生态学生态生态学
进化生物学进化生物学
植物学植物学

背景情况:

生殖隔离障碍对物种分歧至关重要.
自我不相容 (SI) 系统可以防止自我授粉和潜在的跨物种杂交.
了解共生物种的繁殖障碍是评估杂交风险的关键.

研究的目的:

评估自我不相容性在四种相似的Opuntia物种的繁殖隔离中的作用.
为了确定SI是否影响跨物种授粉和杂交潜力.
评估Opuntia物种生命周期的不同阶段的繁殖障碍.

主要方法:

在四种Opuntia物种 (O. cantabrigiensis,O. robusta,O. streptacantha,O. tomentosa) 中评估了自我兼容性和杂交种子的形成.
采用了五种授粉处理:自我授粉,种内交叉授粉,开放授粉,种间交叉授粉,和apomixis.
监测了开花的现象学和同步,以确定潜在的跨物种授粉事件.

主要成果:

四种Opuntia物种都表现出春季开花与一定程度的同步,倾向于两对 (O. cantabrigiensis/O. cantabrigiensis/O. 罗布斯塔和O. 斯特雷普塔坎塔/O. 斯特雷普塔坎塔门植物 (Tomentosa) 进行跨物种授粉.
花 (Opuntia cantabrigiensis) 是自我不兼容的,当被用作跨物种花粉接收者时不会产生杂交种子.
欧邦蒂亚·罗布斯塔 (Opuntia robusta) 产生了低比例的杂交种子,而自我兼容的O. streptacantha和O. tomentosa则产生了杂交种子.

结论:

在Opuntia cantabrigiensis中,自我不相容性会形成一个强大的花粉-杆屏障,导致繁殖隔离.
双胞胎Opuntia robusta,一个有义务的交叉体,显示了部分损失的跨物种花粉歧视.
花粉-花相互作用和开花同步是较弱的繁殖障碍;后期障碍 (发芽,幼苗存活) 需要进一步研究.

关键词:

种类: 种类: 种类:在Opuntia的时间点.SI × SC 规则的SI × SC规则开花的同步是开花的同步.手工授粉的实验,手工授粉的实验.生殖隔离,生殖隔离.单方面的不兼容性.

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