The present study was carried out to investigate how plant growth-promoting bacteria (PGPB) influence plant growth and uptake of boron (B) and phosphorus (P) in rapeseed (Brassica napus). Rapeseed was subjected to control, B, P and B + P treatments, either with or without B. pumilus (PGPB) inoculation, and grown in pot culture for 6 weeks. In the absence of B. pumilus, the addition of B, P or both elements improved the growth of rapeseed compared with the control. Interestingly, B. pumilus inoculation inhibited plant growth and enhanced B uptake under B and B + P but not under control and P conditions. In addition, B. pumilus inoculation decreased the pH of soil under B and B + P supplies. Bacillus pumilus inoculation thus increased rapeseed B uptake and inhibited growth under B supply, which suggests that the effects of PGPB on rapeseed growth depend on the addition of B to soil. Bacillus pumilus inoculation may therefore be recommended for the enhancement of rapeseed B levels in B-deficient soils but not in B-sufficient ones.

中文翻译：

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短短芽孢杆菌可增加硼的吸收并在硼供应下抑制油菜籽的生长，而与磷肥无关。

本研究旨在研究促进植物生长的细菌（PGPB）如何影响植物的生长以及油菜籽（Brassica napus）中硼（B）和磷（P）的吸收。不论是否接种短小芽孢杆菌（PGPB），都要对菜籽进行对照，B，P和B + P处理，并在盆栽中生长6周。在不存在短双歧杆菌的情况下，与对照相比，添加B，P或两种元素均能改善油菜籽的生长。有趣的是，在B和B + P下接种短小芽孢杆菌可抑制植物生长并增加B的吸收，但在对照和P条件下则不会。此外，在B和B + P供应下，短小芽孢杆菌的接种降低了土壤的pH值。因此，接种短小芽孢杆菌会增加油菜对B的吸收并抑制B的供应，这表明PGPB对油菜籽生长的影响取决于土壤中B的添加。因此，建议使用短小芽孢杆菌接种来提高缺硼土壤中菜籽中的B水平，但不建议在缺硼土壤中增加。