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Background  Seed germination and seedling establishment are two of the most critical phases in plant development. However, the molecular mechanisms underlying the effect of phosphorus on seed germination and post-germinated growth of oilseed rape are unclear so far. Here, we report the role of  BnPHT1;4  in seed germination and early seedling development of  Brassica napus .    Results  Our results show that  BnPHT1;4  is preferentially expressed in cotyledons of early developing seedlings. Overexpression of  BnPHT1;4  in oilseed rape promoted seed germination and seedling growth. Expression levels of the genes related to ABA and GA biosynthesis and signaling were significantly altered in  BnPHT1;4  transgenic seedlings. Consequently, active GA level was up-regulated, whereas ABA content was down-regulated in  BnPHT1;4  transgenic seedlings. Furthermore, exogenous GA could promote seed germination of wild type, while exogenous ABA could partially recover the advanced-germination phenotype of  BnPHT1;4  transgenic seeds. Total phosphorus content in cotyledons of the transgenic seedlings was decreased more rapidly than that in wild type when Pi was supplied or deficient, and Pi contents in shoots and roots of the  BnPHT1;4  transgenic plants were higher than those in wild type under high and low Pi conditions.    Conclusions  Our data suggest that the high-affinity transporter BnPHT1;4 is involved in phosphorus acquisition and mobilization for facilitating seed germination and seedling growth of  Brassica napus  by modulating ABA and GA biosynthesis.    Electronic supplementary material  The online version of this article (10.1186/s12870-019-1765-3) contains supplementary material, which is available to authorized users.

bmc plant biology

The high-affinity transporter BnPHT1;4 is involved in phosphorus acquisition and mobilization for facilitating seed germination and early seedling growth of Brassica napus