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| Characteristics of cadmium accumulation in low cadmium-accumulating rice parent and its hybrids |
| Received:January 26, 2016 |
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| KeyWord:low Cd-accumulating parent;hybrid;accumulation;distribution;heterosis;safety production |
| Author Name | Affiliation | E-mail | | LI Kun | College of Resource Science, Sichuan Agricultural University, Chengdu 611130, China | | | YU Hai-ying | College of Resource Science, Sichuan Agricultural University, Chengdu 611130, China | haiyingaa1@163.com | | HUANG Fu | College of Agronomy, Sichuan Agricultural University, Chengdu 611130, China | | | CHEN Guang-deng | College of Resource Science, Sichuan Agricultural University, Chengdu 611130, China | | | ZHANG Lu | College of Resource Science, Sichuan Agricultural University, Chengdu 611130, China | |
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| Abstract: |
| A pot culture experiment was conducted to investigate the characteristics of cadmium(Cd) accumulation, distribution and transport in a low Cd-accumulating rice parent(YaHui2816) and its hybrids(Lu98A/YaHui2816, 5406A/YaHui2816, C268A/YaHui2816, and Rong18A/YaHui2816) in order to select Cd pollution-safe breeding materials. The biomass of the hybrids was significantly higher than that of the parent, which was 21.86%~89.63% greater under 1 to 4 mg·kg-1 Cd treatments. The Cd content in roots, stems and leaves increased as soil Cd concentrations increased. The Cd content in different tissues of the rice parent and its hybrids were in sequence of root > stem, leaf >> ear. The Cd content in ears of 5406A/YaHui2816 and C268A/YaHui2816 was significantly lower than that of the other hybrid combinations, and Cd in their brown rice was only 57.14%~86.36% of that of the rice parent, which was lower than the National Food Safety Standard(0.2 mg·kg-1). The root-shoot translocation factors of Cd in the rice parent and its hybrids were significant decreased when soil Cd increased. The distribution of Cd in different parts of the rice parent was in order of stem > root > leaf > ear, whereas that order was root > stem > leaf > ear in the hybrids. The Cd accumulation in roots of the hybrids was 1.49~3.24 times higher than that of the parent. In conclusion, brown rice Cd content was lower in 5406A/YaHui2816 and C268A/YaHui2816 than in the low Cd-accumulative rice parent, and could be used as potential Cd pollution-safe materials to grow in medium to low Cd-polluted farmland. |
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