苗期水稻和小麦对缺锰胁迫的响应差异及机理
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S158.3

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中国科协青年人才托举工程项目(YESS20200032)和国家自然科学基金项目(32172664)资助。


Differential Tolerance to Manganese-deficiency Stress in Rice and Wheat at Seedling Stage
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    摘要:

    为探究水稻和小麦响应缺锰的差异及其机理,采用水培试验比较了苗期水稻和小麦在缺锰和加锰处理条件下的生长及植株各部位的元素含量和分配情况,并采用绝对定量法比较了小麦和水稻根中锰转运基因的表达水平。结果表明:与供锰充足的植株相比,缺锰21 d严重抑制水稻生长,而小麦生长不受影响;在缺锰条件下,小麦体内锰从根到地上部的转运率比供锰充足时提高了16.4%;相反,水稻体内锰从根到地上部的转运率降低了7.5%;苗期小麦根中TaNRAMP2的绝对表达量是水稻OsNRAMP2的3.8倍~5.1倍。综上可见,小麦比水稻更耐缺锰胁迫,这可能与NRAMP2在小麦中的高表达有关。

    Abstract:

    To explore the difference in response to Mn deficiency between rice and wheat, the growth, element concentration and distribution in different parts of rice and wheat grown in hydroponic culture under Mn-deficiency and -sufficient conditions were compared. Furthermore, the expression level of Mn-related transporter genes in the roots between two species were compared. The rescelts showed that compared with plants with sufficient Mn supply at seedling stage, Mn deficiency for 21 days resulted in serious growth inhibition in rice, but not in wheat. Under Mn-deficient condition, the translocation rate of Mn from root to shoot in wheat increased by 16.4% compared with sufficient Mn supply. In contrast, the translocation rate of Mn from root to shoot in rice decreased by 7.5%. Expression analysis showed that the absolute expression level of TaNRAMP2 in wheat roots was 3.8-5.1 times higher than that of OsNRAMP2 in rice. These results indicate that wheat is more tolerant to Mn deficiency stress than rice through efficient root-to-shoot translocation, which may be associated with higher expression of NRAMP2 in wheat.

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夏越,沈仁芳,马建锋,车景.苗期水稻和小麦对缺锰胁迫的响应差异及机理[J].土壤,2023,55(6):1207-1215. XIA Yue, SHEN Renfang, MA Jianfeng, CHE Jing. Differential Tolerance to Manganese-deficiency Stress in Rice and Wheat at Seedling Stage[J]. Soils,2023,55(6):1207-1215

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  • 收稿日期:2023-01-13
  • 最后修改日期:2023-02-10
  • 录用日期:2023-02-13
  • 在线发布日期: 2023-12-22
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