Abstract
When exposed to cadmium (Cd), rice (Oryza sativa L.) suffers a loss in biomass as well as an increased concentration of Cd within the plant. When looking for genes that can reduce Cd accumulation or increase Cd tolerance, the wild relatives of rice are under-utilised resources. In this study, a rapid hydroponic screening system was established using known tolerant and sensitive O. sativa accessions, and found that 10 µmol/L Cd concentration appeared to be the optimum for screening Cd tolerance of rice cultivars. Then, 18 wild rice accessions were screened for Cd tolerance and accumulation. Significant differences in percentage tolerance to Cd of the wild rice accessions were observed for root length, shoot length and shoot dry weight. Moreover, there were significant differences between the wild rice species for percentage tolerance to Cd and shoot Cd concentration in all plant growth traits (P-value < 0.05). O. longistaminata, a tolerant species, had 1.5- to 2.0-fold higher percentage tolerance in comparison with O. rufipogon, the most sensitive species, and had an almost 3-fold higher shoot Cd concentration compared with O. barthii. O. longistaminata accessions displayed high tissue-level tolerance to Cd. This data suggests a wide variation of these traits amongst the wild rice species.
| Original language | English |
|---|---|
| Pages (from-to) | 181-185 |
| Journal | Rice Science |
| Volume | 30 |
| Issue number | 3 |
| Early online date | 21 Sept 2022 |
| DOIs | |
| Publication status | Published - 28 May 2023 |
Bibliographical note
ACKNOWLEDGEMENTSWe acknowledge financial support from the School of Biological Sciences, University of Aberdeen for funding this study.