Plastic transport systems of rice for mineral elements in response to diverse soil environmental changes

Abstract

Summary Climate change will increase frequency of drought and flooding, which threaten global crop productivity and food security. Rice (Oryza sativa) is unique in that it is able to grow in both flooded and upland conditions, which have large differences in the concentrations and chemical forms of mineral elements available to plants. To comprehensively understand the mechanisms of rice for coping with different water status, we performed ionomics and transcriptomics analysis of the roots, nodes and leaves of rice grown in flooded and upland conditions. Focusing the analysis on genes encoding proteins involved in transport functions for mineral elements, it was found that, although rice plants maintained similar levels of each element in the shoots for optimal growth, different transporters for mineral elements were utilised for nitrogen, iron, copper and zinc to deal with different soil water conditions. For example, under flooded conditions, rice roots take up nitrogen using transporters for both ammonium (OsAMT1/2) and nitrate (OsNPF2.4, OsNRT1.1A and OsNRT2.3), whereas under upland conditions, nitrogen uptake is mediated by different nitrate transporters (OsNRT1.1B and OsNRT1.5A). This study shows that rice possesses plastic transport systems for mineral elements in response to different water conditions (upland and flooding).

The ZIP Transporter Family Member OsZIP9 Contributes To Root Zinc Uptake in Rice under Zinc-Limited Conditions

“…6). This is also supported by higher expression of OsZIP9 under flooded conditions compared to upland conditions (Wang et al, 2020). Because knockout of OsZIP9 did not completely abolish Zn uptake even under Zn-limited conditions (Fig.…”

“…This is in contrast to AtZIP9 and AtZIP12 in Arabidopsis, whereby knockout of AtZIP9 and AtZIP12 only affects Zn uptake at high Zn concentrations and not at low Zn concentrations (Inaba et al, 2015). In paddy soil, the Zn concentration in soil solution is very low (Wang et al, 2020). In fact, OsZIP9 plays an important role in Zn uptake from soil because knockout mutants of OsZIP9 exhibited significant decreases in Zn accumulation in both the straw and brown rice under flooded conditions (Fig.…”

“…However, in soil culture, knockout of OsZIP9 did not affect Fe accumulation in the shoots (Fig. 6), due to high Fe concentration in soil solution of paddy soil (Wang et al, 2020).…”

Decoding Plant–Environment Interactions That Influence Crop Agronomic Traits

“…2017 ). A combinatorial approach using ionome and transcriptome profiling recently illustrated plastic systems for mineral transportation in response to different soil water conditions in rice ( Wang et al. 2020 ).…”

Jian Feng Ma

“…Rice is a staple food for half of the world's population and provides us with energy, protein, mineral elements and so on. Rice is amazing because it can grow under both flooded and upland conditions, which have very different conditions in terms of oxygen, and concentration and chemical forms of mineral nutrients (Wang et al (2020). Rice has developed multiple strategies for surviving in such diverse environments.…”