| 水稻不同生育期As胁迫下As累积关键生育期 |
| 摘要点击 1357 全文点击 612 投稿时间：2020-04-09 修订日期：2020-04-29 |
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| 中文关键词 水稻 As胁迫 生育期 累积速率 相对贡献 |
| 英文关键词 rice Arsenic stress growth stage accumulation rate relative contribution rate |
| 作者 | 单位 | E-mail | | 邓鹏辉 | 中南林业科技大学环境科学与工程学院, 长沙 410004 | 987191187@qq.com | | 蔡雅琴 | 中南林业科技大学环境科学与工程学院, 长沙 410004 | | | 周航 | 中南林业科技大学环境科学与工程学院, 长沙 410004
稻米品种安全控制湖南省工程实验室, 长沙 410004 | zhouhang4607@163.com | | 刘雅 | 中南林业科技大学环境科学与工程学院, 长沙 410004 | | | 杨文俊 | 中南林业科技大学环境科学与工程学院, 长沙 410004 | | | 辜娇峰 | 中南林业科技大学环境科学与工程学院, 长沙 410004
稻米品种安全控制湖南省工程实验室, 长沙 410004 | gujiaofeng@163.com | | 廖柏寒 | 中南林业科技大学环境科学与工程学院, 长沙 410004
稻米品种安全控制湖南省工程实验室, 长沙 410004 | |
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| 中文摘要 |
| 水稻不同生育期对As的吸收累积差异明显.为研究水稻糙米As累积的关键生育期，明确不同生育期吸收累积As对糙米As累积的贡献，本研究通过水培试验，分别在水稻分蘖期（30 d）、拔节期（16 d）、孕穗期（13 d）、灌浆期（17 d）、蜡熟期（15 d）、成熟期（13 d）和全生育期（104 d）添加外源As，及不添加外源As处理作为对照CK.结果表明：①不同生育期As胁迫对水稻植株生物量有显著影响，与对照CK相比，单一时期As胁迫处理中仅分蘖期As胁迫处理下植株生物量增加，其他处理均降低，其中孕穗期As胁迫处理最低，所有单一时期As胁迫处理植株生物量均高于全生育时期As胁迫下植株生物量；②6个单一时期As胁迫处理糙米中As含量均高于对照CK糙米中As含量，范围为0.08~0.24 mg ·kg-1，其中孕穗期As胁迫处理糙米As含量最高，为全生育时期As胁迫处理糙米As含量的64.9%；③6个单一时期As胁迫处理糙米As的累积量均高于对照CK，范围为1.4~4.5 μg ·株-1，其中孕穗期As胁迫处理糙米As累积量最高，其次是灌浆期，而全生育时期As胁迫处理糙米As累积量为5.7 μg ·株-1，高于所有单一时期As胁迫处理糙米As的累积量；④水稻孕穗期累积的As对水稻成熟期糙米中As累积量的相对贡献率最大，为40.3%，其次为灌浆期，相对贡献率为26.0%，孕穗期和灌浆期是水稻成熟期糙米As累积的关键生育期. |
| 英文摘要 |
| The absorption and accumulation of As at different stages of rice growth are significantly different. To study the key growth stages of As accumulation in brown rice and to determine the contribution of As accumulation at different growth stages to As contribution in brown rice, a rice hydroponics experiment was carried out by adding external As during the different rice growth stages: tillering stage (30 d), jointing stage (16 d), booting stage (13 d), filling stage (17 d), dough stage (15 d), maturity stage (13 d), and full growth period (104 d). The results showed that: ① As stress at different growth stages had a significant effect on the biomass of rice plants. In comparison with the control CK, the treatments of As stress with five single-stages decreased the rice biomass, except during the tillering stage. Among these treatments, although the As stress at booting stage had the lowest rice biomass, the biomass of all the rice plants were higher than that for As stress in the full growth period. ② The content of As in brown rice for all the treatments of As stress at six single-stages, ranging from 0.08-0.24 mg ·kg-1, was higher than that of CK. Among these six treatments, the As stress at booting stage had the highest As content in brown rice, accounting for 64.9% of the As content in the full growth period. ③ The accumulation of As in brown rice for all the treatments of As stress at six single-stages was higher than that of CK, and ranged from 1.4-1.5 μg ·plant-1. Among these six treatments, the As stress at booting stage had the highest As accumulation, followed by filling stage. The accumulation of As in brown rice treated with As stress was highest in the full growth period with a value of 5.7 μg ·plant-1. ④ The relative contribution of As stress at the booting stage was the highest for the As accumulation in brown rice and reached to 40.3%, followed by filling stage with 26.0%. Therefore, the rice growth stages of the booting stage and filling stage were the key stages of As accumulation in brown rice. |
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