Dos Santos Railson Schreinert, Farias Daniel da Rosa, Pegoraro Camila, Rombaldi Cesar Valmor, Fukao Takeshi, Wing Rod A, de Oliveira Antonio Costa
Technology Development Center (CDTec), Universidade Federal de Pelotas, Pelotas, Brazil.
Plant Genomics and Breeding Center (CGF), Universidade Federal de Pelotas, Pelotas, Brazil.
Rice (N Y). 2017 Dec;10(1):4. doi: 10.1186/s12284-016-0140-3. Epub 2017 Feb 7.
Tolerance to complete submergence is recognized in a limited number of Asian rice (Oryza sativa L.) varieties, most of which contain submergence-inducible SUB1A on the polygenic SUBMERGENCE-1 (SUB1) locus. It has been shown that the SUB1 locus encodes two Ethylene-Responsive Factor (ERF) genes, SUB1B and SUB1C, in all O. sativa varieties. These genes were also found in O rufipogon and O nivara, wild relatives of O. sativa. However, detailed analysis of the polygenic locus in other Oryza species has not yet been made.
Chromosomal location, phylogenetic, and gene structure analyses have revealed that the SUB1 locus is conserved in the long arm of chromosome 9 in most Oryza species. We also show that the SUB1A-like gene of O. nivara is on chromosome 1 and that Leersia perrieri, a grass-tolerant to deep-flooding, presents three ERF genes in the SUB1 locus.
We provide here a deeper insight into the evolutionary origin and variation of the SUB1 locus and raise the possibility that an association of these genes with flooding tolerance in L. perrieri may exist.
在少数亚洲水稻（Oryza sativa L.）品种中发现了对完全淹没的耐受性，其中大多数在多基因的耐淹1（SUB1）位点上含有可被淹没诱导的SUB1A。研究表明，在所有水稻品种中，SUB1位点编码两个乙烯响应因子（ERF）基因，即SUB1B和SUB1C。在栽培稻的野生近缘种药用野生稻和尼瓦拉野生稻中也发现了这些基因。然而，尚未对其他稻属物种的多基因位点进行详细分析。
染色体定位、系统发育和基因结构分析表明，SUB1位点在大多数稻属物种的9号染色体长臂上是保守的。我们还表明，尼瓦拉野生稻的SUB1A类基因位于1号染色体上，而耐深淹的李氏禾在SUB1位点上有三个ERF基因。
我们在此对SUB1位点的进化起源和变异有了更深入的了解，并提出这些基因可能与李氏禾的耐淹性有关的可能性。
