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| Differences in root morphology, rhizosheath traits, and Cd uptake in maize cultivars |
| Received:June 28, 2020 |
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| KeyWord:maize;root morphology;rhizosheath;cadmium content;cultivar difference |
| Author Name | Affiliation | E-mail | | YU Zi-hao | College of Resources and Environment, Yunnan Agricultural University, Kunming 650201, China | | | LI Sheng-bao | College of Resources and Environment, Yunnan Agricultural University, Kunming 650201, China | | | ZHAO Xiao-ling | College of Resources and Environment, Yunnan Agricultural University, Kunming 650201, China | | | LI Ming-rui | College of Resources and Environment, Yunnan Agricultural University, Kunming 650201, China | | | LI Bo | College of Resources and Environment, Yunnan Agricultural University, Kunming 650201, China | | | HE Yong-mei | College of Resources and Environment, Yunnan Agricultural University, Kunming 650201, China | | | CHEN Jian-jun | College of Resources and Environment, Yunnan Agricultural University, Kunming 650201, China | | | ZHAN Fang-dong | College of Resources and Environment, Yunnan Agricultural University, Kunming 650201, China | zfd97@ynau.edu.cn |
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| Abstract: |
| A pot experiment was conducted using 12 Yunnan maize cultivars to study the different responses of root morphology, rhizosheath characteristics, and Cd accumulation characteristics in Cd-contaminated soil. The results showed that there were significant differences in the biomass, root morphology, rhizosheath characteristics, and Cd accumulation characteristics in different maize cultivars. Among them, the root length, root surface area, root volume, root tip number, and branch number were greatly different, with maximums were 2.9, 2.9, 3.2, 5.5, and 6.1 times of minimums, respectively. The difference in the average root diameter was small, with the maximums was 1.48 times of the minimum. The largest differences in the rhizosheath weight, rhizosheath development index, and available Cd content in the rhizosheath soil were 3.1, 5.8, and 1.8 times, respectively. The maximums in the Cd content in the shoots and roots were 6.4 and 6.1 times of minimums, respectively. The maximums in the Cd accumulation in the shoots and roots were 6.5 and 4.0 times of minimums, respectively. Correlation analysis showed that the root surface area and root volume were significantly negatively correlated with the shoot Cd content, while the root tip number was significantly negatively correlated with the root Cd content. The rhizosheath weight was significantly negatively correlated with the shoot Cd content, while the rhizosheath development index was significantly positively correlated with the root Cd content. Thus, the different responses of Cd uptake were attributed to the root morphology and rhizosheath characteristics. |
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