Deoxymugineic acid increases Zn translocation in Zn-deficient rice plants.
Deoxymugineic acid increases Zn translocation in Zn-deficient rice plants.
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DOI：
10.1007/s11103-008-9292-x
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发表时间：
2008-04
影响因子：
5.1
通讯作者：
Nishizawa, Naoko K.
中科院分区：
文献类型：
--
作者：
Suzuki, Motofumi;Tsukamoto, Takashi;Inoue, Haruhiko;Watanabe, Satoshi;Matsuhashi, Shinpei;Takahashi, Michiko;Nakanishi, Hiromi;Mori, Satoshi;Nishizawa, Naoko K.
脱氧麦根酸（DMA）是麦根酸家族植物铁载体（MAs）的成员，其是由禾本科植物产生的天然金属螯合剂。水稻在缺铁时分泌DMA，以Fe（III）-MAs复合物的形式吸收Fe。与大麦相比，其根分泌的DMA响应缺锌，由水稻根分泌DMA的量略有下降，在低锌供应的条件下。有一个伴随的增加，在水稻芽内源DMA，表明DMA中发挥作用的锌在缺锌水稻植株的转运。OsNAS1和OsNAS2的表达在缺锌的根中没有增加，但OsNAS3的表达在缺锌的根和芽中增加。OsNAAT 1的表达在缺锌的根中也增加，并且在芽中显著增加;相应地，HPLC分析无法检测缺锌芽中的烟酰胺。OsDMAS1基因在缺锌植株中的表达量增加。利用正电子发射示踪成像系统（PETIS）分析表明，缺锌水稻根系吸收的~（62）Zn-DMA少于~（62）Zn~（2+）。重要的是，供应62 Zn-DMA而不是62 Zn 2+增加了62 Zn向缺锌植物叶片的转运。这在歧视中心（DC）尤为明显。这些结果表明，DMA在缺锌水稻植株中具有重要的作用，在植物内的锌的分配，而不是从土壤中吸收锌。本文的在线版本（doi：10.1007/s11103 - 008 - 9292-x）包含补充材料，可供授权用户使用。
Deoxymugineic acid (DMA) is a member of the mugineic acid family phytosiderophores (MAs), which are natural metal chelators produced by graminaceous plants. Rice secretes DMA in response to Fe deficiency to take up Fe in the form of Fe(III)–MAs complex. In contrast with barley, the roots of which secrete MAs in response to Zn deficiency, the amount of DMA secreted by rice roots was slightly decreased under conditions of low Zn supply. There was a concomitant increase in endogenous DMA in rice shoots, suggesting that DMA plays a role in the translocation of Zn within Zn-deficient rice plants. The expression of OsNAS1 and OsNAS2 was not increased in Zn-deficient roots but that of OsNAS3 was increased in Zn-deficient roots and shoots. The expression of OsNAAT1 was also increased in Zn-deficient roots and dramatically increased in shoots; correspondingly, HPLC analysis was unable to detect nicotianamine in Zn-deficient shoots. The expression of OsDMAS1 was increased in Zn-deficient shoots. Analyses using the positron-emitting tracer imaging system (PETIS) showed that Zn-deficient rice roots absorbed less 62Zn-DMA than 62Zn2+. Importantly, supply of 62Zn-DMA rather than 62Zn2+ increased the translocation of 62Zn into the leaves of Zn-deficient plants. This was especially evident in the discrimination center (DC). These results suggest that DMA in Zn-deficient rice plants has an important role in the distribution of Zn within the plant rather than in the absorption of Zn from the soil. The online version of this article (doi:10.1007/s11103-008-9292-x) contains supplementary material, which is available to authorized users.
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影响因子：
1.6
作者：
Kume, T;Matsuhashi, S;Sekine, T
通讯作者：
Sekine, T
影响因子：
7.4
作者：
Ramesh, SA;Shin, R;Schachtman, DP
通讯作者：
Schachtman, DP
影响因子：
7.2
作者：
Suzuki, Motofumi;Takahashi, Michiko;Nishizawa, Naoko K.
通讯作者：
Nishizawa, Naoko K.
影响因子：
6.4
作者：
WALTER, A;ROMHELD, V;MORI, S
通讯作者：
MORI, S
影响因子：
4.3
作者：
Kobayashi, T;Nakanishi, H;Mori, S
通讯作者：
Mori, S