Wild rice species are expected to possess genes that are potentially useful for rice breeding. Backcross inbred lines (BILs) derived from a cross of a japonica rice ‘Shiokari’ and a progeny line from a cross of a japonica ‘Taichung 65’ and Oryza longistaminata MwM were examined for agronomic traits. Some BILs showed vigorous growth and increased yield relative to ‘Shiokari’. One of such BILs was further analysed using QTL mapping followed by map-based cloning to identify the causal gene. An allele of OsPRR37, which encodes a pseudo response regulator protein, in O. longistaminata was found responsible for the traits and named OlPRR37. OlPRR37 was expressed more than an OsPRR37 allele from a japonica ‘Nipponbare’ in the heterozygotes of the two alleles. The genomic clone of OlPRR37 and the coding sequences of both OlPRR37 and the ‘Nipponbare’ allele driven by the promoter of OlPRR37 similarly functioned as high-yielding genes in transgenic rice. Thus, higher expression of PRR37 by the OlPRR37 promoter likely conferred the increased yield. Accordingly, OlPRR37 may be used to improve rice productivity.

中文翻译：

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水稻（Oryza sativa）基因渗入系和携带来自野生稻 O. longistaminata 的 PRR37 等位基因的转化体的旺盛生长和高产

预计野生稻种具有可能对水稻育种有用的基因。对源自粳稻 'Shiokari' 杂交的回交自交系 (BIL) 和来自粳稻 '台中 65' 和长稻MwM杂交的后代系进行了农艺性状检查。一些 BIL 显示出相对于“Shiokari”的强劲增长和增加的产量。使用 QTL 作图和基于图谱的克隆来进一步分析此类 BIL 之一，以鉴定因果基因。发现O. longistaminata中OsPRR37的等位基因（编码假反应调节蛋白）与这些性状有关，并将其命名为OlPRR37。OlPRR37 的表达比OsPRR37 多两个等位基因杂合子中来自粳稻'日本晴'的等位基因。的基因组克隆OlPRR37以及两者的编码序列OlPRR37和“日本晴”等位基因通过的启动子驱动OlPRR37类似地充当在转基因水稻高产基因。因此，OlPRR37启动子对PRR37的更高表达可能会增加产量。因此，OlPRR37可用于提高水稻产量。