Low phosphorus availability increases shoot boron concentration in canola and potato but not in wheat

Abstract

A large proportion of global agricultural soils contain suboptimal available phosphorus (P) for the growth of many plant species. Boron (B) plays important roles in plant growth and development, but limited research has been conducted to study B uptake under low P availability. This study comprised a hydroponic and a mini-rhizobox experiment with canola (Brassica napus L.), potato (Solanum tuberosum L.) and wheat (Triticum aestivum L.) under P sufficient and deficient conditions. Boron concentrations, rhizosphere soil pH, and gene expression of BnBOR1 in canola were determined. Shoot B concentrations were found significantly increased (11–149%) by low P availability in potato and canola but not in wheat. Reverse transcription polymerase chain reaction (RT-PCR) indicated that BnBOR1;2a, BnBOR1;2c, and BnBOR1;3c were up-regulated after seven days of low P treatment in canola roots. Our results indicate that plant shoot B concentration was dramatically influenced by P availability, and dicots and monocots showed a contrasting B concentration response to low P availability.

Silicon modifies leaf nutriome and improves growth of oak seedlings exposed to phosphorus deficiency and Phytophthora plurivora infection

“…This Si-mediated improvement of leaf P status could have further led to some complex changes in the uptake and accumulation of other nutrients. For instance, Wang et al. (2018) showed that P-deficiency stimulated increased B uptake in dicots (which have intrinsically higher B requirements), but not in monocots, what is in accordance with our findings in pedunculate oak ( Figures 6A , 7A ).…”

“…This Si-mediated improvement of leaf P status could have further led to some complex changes in the uptake and accumulation of other nutrients. For instance, Wang et al (2018) showed P-deficiency stimulated increased B uptake in dicots (which have intrinsically higher B requirements), but not in monocots, what is in accordance with our findings in pedunculate oak (Figures 6A, 7A). In both rhizobox and hydroponic experiments, these authors demonstrated the up-regulation of BnBOR1 transporter in oilseed rape by the lack of P. We further showed that when plant P status was improved by Si addition (Figure 6A), the uptake and leaf accumulation of B was decreased (Table 4; Figure 7A).…”

“…In fact, we can not explain the Simediated changes of the majority of the examined nutrients under the three stresses. For instance, leaf B (Figure 7A) was also found to increase in different species under P deficiency (Baxter et al, 2008;Wang et al, 2020;Meng et al, 2021), which was further confirmed by increased expression of B transporters (Wang et al, 2018). In our work, the addition of Si under individual stress conditions tended to restore B but also P accumulation levels closer to the control.…”

Physiological and Nutritional Responses of ‘HB’ Pummelo [Citrus grandis (L.) Osbeck ‘Hirado Buntan’] to the Combined Effects of Low pH Levels and Boron Deficiency

“…Previous studies have shown that not only is P concentration significantly affected by B status (deficiency or toxicity), but B concentration is also dramatically influenced by P availability (Wang et al, 2018;Zhou et al, 2014). In this study, the P concentration significantly decreased in all organs of the seedlings under B-deficient conditions, particularly in the leaf at pH 6.0 ( Fig.…”