调节番茄根架构和根毛对ABA代谢的草原细菌的反应
Andrey A Belimov1, Ian C Dodd2
1All-Russia Research Institute for Agricultural Microbiology, Pushkin, Saint Petersburg, 196608 Russia.
概括
代谢酸 (ABA) 的树枝杆菌可以降低番茄植物对 (Cd) 的耐受性. 这些微生物可以增强根毛发的生长,但抑制主根的延长,在Cd压力下对整体植物健康产生负面影响.
科学领域:
- 植物科学 植物科学
- 微生物学 微生物学
- 环境科学 环境科学
背景情况:
- 外源 (Cd) 暴露刺激植物中酸 (ABA) 积累,通过维持生长和限制Cd吸收来提高耐受性.
- 能够代谢ABA的树脂细菌可能会干扰这种植物防御机制,可能会降低耐受性.
研究的目的:
- 调查ABA代谢的草根细菌对番茄植物中耐受性的影响.
- 确定这些细菌对植物生长,ABA水平和积累的影响.
- 阐明ABA在调节根特征,包括根毛发育中的作用.
主要方法:
- 番茄植物 (Ailsa-Craig) 在CdCl2的不同条件下在体外生长,并用ABA代谢菌株 (Rhodococcus sp. P1Y,诺沃斯芬戈菌种子sp. P6W) 或一个对照菌株 (Variovorax paradoxus 5C-2).
- 测量了根和叶子中的Cd和ABA度.
- 评估了植物生长参数 (主要根长度,侧根数量,根毛长度和密度).
- 用ABA缺乏突变物 (flacca) 和野生型植物进行实验,以研究ABA在根部发育中的作用.
主要成果:
- 与对照菌株相比,ABA代谢菌株的根植殖率较低,特别是在Cd压力下.
- 只有对照菌株 (V. paradoxus 5C-2) 降低了叶子Cd度;根Cd不受接种的影响.
- 代谢ABA的菌株改变了植物组织中的ABA水平,在Cd压力下,抑制了主要根的延长,同时增加了侧根长度 (P1Y).
- 两种ABA代谢菌株和Cd都促进了根毛发的生长;缺乏ABA的突变物表现出更长的根毛发,这表明这些特征的ABA独立调节.
结论:
- 代谢ABA的根系细菌损害了番茄植物的耐受性,主要是通过抑制主要根的延长,尽管可能增强根毛发育.
- 这项研究强调了植物激素,树根细菌和重金属压力之间的复杂相互作用,影响了植物生长和防御机制.
- ABA在调节根和根毛发的发育方面发挥着作用,但ABA独立的途径也对根毛发的延长有显著的贡献.
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