| 狄雪荣,管远清,丁永祯,张克强,戴礼洪,冯人伟,王瑞刚,李道贤.不同水分条件下水稻对硒的吸收与转运[J].农业环境科学学报,2019,38(10):2263-2269. |
| 不同水分条件下水稻对硒的吸收与转运 |
| Effects of different water managements on the uptake and transport of selenium in rice exposed to different selenium species |
| 投稿时间：2019-02-19 |
| DOI：10.11654/jaes.2019-0169 |
| 中文关键词: 水稻 硒 水分管理 转运系数 |
| 英文关键词: rice Se water management transfer coefficient |
| 基金项目:国家自然科学基金项目（41471274） |
| 作者 | 单位 | E-mail | | 狄雪荣 | 农业农村部环境保护科研监测所, 天津 300191
农业农村部产地环境污染防控重点实验室, 天津 300191 | | | 管远清 | 农业农村部环境保护科研监测所, 天津 300191 | | | 丁永祯 | 农业农村部环境保护科研监测所, 天津 300191
农业农村部产地环境污染防控重点实验室, 天津 300191 | dingyongzhen@caas.cn | | 张克强 | 农业农村部环境保护科研监测所, 天津 300191 | | | 戴礼洪 | 农业农村部环境保护科研监测所, 天津 300191 | | | 冯人伟 | 福建农林大学, 福州 350002 | | | 王瑞刚 | 农业农村部环境保护科研监测所, 天津 300191
农业农村部产地环境污染防控重点实验室, 天津 300191 | | | 李道贤 | 农业农村部环境保护科研监测所, 天津 300191 | |
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| 中文摘要: |
| 为考察不同水分条件下施加不同形态和浓度的硒（Se）对水稻Se吸收与转运的影响，采用盆栽试验，研究了湿润灌溉和常规灌溉下，土施0、1.0、5.0 mg·kg-1的Na2SeO3[Se（Ⅳ）]和Na2SeO4[Se（Ⅵ）]对水稻Se吸收与转运的影响。结果显示，施Se显著促进水稻生长，秸秆干质量和籽粒产量较CK增幅，湿润灌溉下分别为22.35%~39.76%和35.42%~61.94%，常规灌溉下分别为19.18%~57.23%和4.02%~55.37%。根、茎、叶和籽粒各部位Se含量随Se处理浓度的升高而显著升高。低、高浓度Se（Ⅳ）处理，在湿润灌溉下，根Se含量分别是CK的3.69倍和12.05倍，茎硒含量分别是CK的2.71倍和20.33倍，叶硒含量分别是CK的1.95倍和10.76倍，糙米硒含量分别是CK的6.94倍和29.72倍，精米硒含量分别是CK的6.86倍和31.61倍；在常规灌溉下，根硒含量分别是CK的2.12倍和5.56倍，茎硒含量分别是CK的2.51倍和11.70倍，叶硒含量分别是CK的2.97倍和10.94倍，糙米硒含量分别是CK的4.53倍和23.69倍，精米硒含量分别是CK的5.29倍和23.37倍。Se浓度、Se形态和水分条件对根、茎、叶、糙米Se含量存在显著的交互作用（P<0.05）。根系Se含量在湿润灌溉下表现出Se （Ⅳ）处理显著高于Se （Ⅵ）处理；茎Se含量在高浓度Se处理下，湿润灌溉显著高于常规灌溉，Se（Ⅳ）处理显著高于Se（Ⅵ）；籽粒在湿润灌溉下的Se含量显著高于同浓度下的常规灌溉处理。相对于常规灌溉，湿润灌溉显著增加水稻茎/根、糙米/茎、糙米/叶Se转运系数，增幅分别为40%~158.82%、44.23%~94.73%和6.78%~228.85%。研究表明，相比常规灌溉，湿润灌溉更有利于Se向籽粒转运。 |
| 英文摘要: |
| Selenium is a beneficial trace element for plants. In this study, a pot experiment was conducted to study the effects of conventional irrigation and wetting irrigation on Se uptake and transport in rice subjected to different doses(0, 1.0, and 5.0 mg·kg-1)of selenite (Na2SeO3)and selenate(Na2SeO4). The results showed that the addition of Se significantly promoted rice growth. Compared with the control treatment, under wetting irrigation, the addition of Se increased the straw dry weight and grain yield by 22.35%~39.76% and 35.42%~61.94%, respectively. Under conventional irrigation, the straw dry weight and grain yield were increased by 19.18%~57.23% and 4.02%~55.37%, respectively. The content of Se in the roots, stems, leaves, and grains of rice increased significantly with an increase in Se treatment concentration. Under wetting irrigation, the root Se content in the low(1.0 mg·kg-1)and high(5.0 mg·kg-1)Se(Ⅳ)treatments was 3.69 and 12.05 times higher than that in the control treatment. The respective fold changes were 2.71 and 20.33 in stems, 1.95 and 10.76 in leaves, 6.94 and 29.72 in brown rice, and 6.86 and 31.61 in fine grains. However, under conventional irrigation and Se(Ⅳ)treatment conditions, the respective fold changes were 2.12 and 5.56 in roots, 2.51 and 11.70 in stems, 2.97 and 10.94 in leaves, 4.53 and 23.69 in brown rice, and 5.29 and 23.37 in fine grains. There were significant interactions among Se treatment concentration, Se species treatment, and water management strategies with regard to Se content in the roots, stems, leaves, and brown rice(P<0.05). Under wetting irrigation, Se concentration in the roots exposed to Se(Ⅳ)was significantly higher than that in roots exposed to Se(Ⅵ). When plants were exposed to 5.0 mg·kg-1 Se, the stem Se content under wetting irrigation was significantly higher than that under conventional irrigation, and the stem Se content in plants exposed to Se(Ⅳ)treatment was significantly higher than that in plants exposed to Se(Ⅵ)treatment. Compared with conventional irrigation, wetting irrigation facilitated the accumulation of Se in the grain. Furthermore, compared with conventional irrigation, wetting irrigation significantly increased the Se transfer coefficients of roots to stems, stems to grains, and leaves to grains, by 40%~158.82%, 44.23%~94.73%, and 6.78%~228.85%, respectively. In summary, compared with conventional irrigation, wetting irrigation is conducive to Se accumulation in rice grains. |
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