在Paeonia ostii和P.之间存在种际杂交障碍. ludlowii 在线阅读
Yingzi Guo1,2, Yan Zhang2, Yanli Wang2
1College of Landscape Architecture and Art, Henan Agricultural University, Zhengzhou 450002, China.
Plants (Basel, Switzerland)
|April 12, 2025
概括
由于预先受精的问题,Paeonia ludlowii表现出与种植的子交叉能力障碍. KCl治疗 (KH) 促进了花粉管生长和混合胚胎发育,为克服这一障碍提供了洞察力.
科学领域:
- 植物生殖生物学 植物生殖生物学
- 园艺科学 园艺科学
- 植物育种 植物育种
背景情况:
- Paeonia ludlowii是一种有价值但临灭绝的树生殖质.
- 一个显著的穿越性障碍限制了从P. ludlowii到栽培树的基因转移.
- 了解这一障碍对于保护和改善树遗传资源至关重要.
研究的目的:
- 调查P. ludlowii和Paeonia ostii"Fengdan"之间缺乏交叉性的原因.
- 识别导致杂交失败的前受精和后受精因素.
- 评估KCl处理在克服可穿越性障碍方面的有效性.
主要方法:
- 进行了远程交叉授粉 (DH) 和自我授粉 (CK) 实验.
- 应用KCl溶液处理在授粉 (KH) 之前的标记.
- 分析了花粉管的行为,的生化成分,胚胎发育和种子组.
主要成果:
- 远程交叉授粉 (DH) 显示出显著的花粉管异常,包括质形成和抑制生长.
- 与DH相比,KCl治疗 (KH) 改善了花粉管的延长,并减少了异常.
- 在DH中观察到预受精障碍,包括缺少污名液和改变的激素水平 (高ABA,MeJA;低BR,GA3),在DH中观察到.
- 胚胎和内流产发生在DH和KH中,导致种子流产,主要是由于缺乏auxins,gibberellins,可溶性蛋白质和糖.
结论:
- 在P. ludlowii和P. ostii"Fengdan"之间进行种际杂交的主要障碍是预先受精.
- KCl处理 (KH) 有效地促进了花粉管的生长,并促进了杂交胚胎的发展.
- 这些发现提供了克服树杂交障碍的策略.
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