Laboratory of Plant Nutrition, Division of Applied Life Sciences, Graduate School of Agriculture, Kyoto University, Kyoto 606-8502, Japan.
Plant Physiol. 2011 Jul;156(3):1457-63. doi: 10.1104/pp.110.171470. Epub 2011 May 4.
We identified a gene responsible for tolerance to boron (B) toxicity in rice (Oryza sativa), named BORON EXCESS TOLERANT1. Using recombinant inbred lines derived from the B-toxicity-sensitive indica-ecotype cultivar IR36 and the tolerant japonica-ecotype cultivar Nekken 1, the region responsible for tolerance to B toxicity was narrowed to 49 kb on chromosome 4. Eight genes are annotated in this region. The DNA sequence in this region was compared between the B-toxicity-sensitive japonica cultivar Wataribune and the B-toxicity-tolerant japonica cultivar Nipponbare by eco-TILLING analysis and revealed a one-base insertion mutation in the open reading frame sequence of the gene Os04g0477300. The gene encodes a NAC (NAM, ATAF, and CUC)-like transcription factor and the function of the transcript is abolished in B-toxicity-tolerant cultivars. Transgenic plants in which the expression of Os04g0477300 is abolished by RNA interference gain tolerance to B toxicity.
我们鉴定了一个与水稻硼(B)耐性相关的基因,命名为 BORON EXCESS TOLERANT1。利用来自硼毒性敏感的籼稻生态型品种 IR36 和耐性粳稻生态型品种 Nekken 1 的重组自交系,将对 B 毒性耐性的相关区域缩小到 49 kb 的第 4 号染色体上。该区域注释了 8 个基因。通过 eco-TILLING 分析比较了硼毒性敏感的粳稻品种 Wataribune 和硼耐性粳稻品种 Nipponbare 之间该区域的 DNA 序列,发现基因 Os04g0477300 的开放阅读框序列中存在一个碱基的插入突变。该基因编码一个 NAC(NAM、ATAF 和 CUC)样转录因子,而在硼耐性品种中该转录物的功能被废除。通过 RNA 干扰使 Os04g0477300 表达失活的转基因植物获得了对 B 毒性的耐性。