Compared with annual cultivated rice, perennial rice had great advantages of soil erosion control, labor saving, water and fertilizer management, etc. As the key organ for perenniality, rhizome can help grasses to achieve rapid expansion to occupy more environmental resources, and withstand the harsh environmental conditions. Oryza longistaminata, a perennial wild relative of rice with vigorous rhizomes, is an ideal donor for transferring perenniality to Asian cultivated rice (Oryza sativa). However, some hybrid F1 between O. longistaminata and cultivated rice didn’t have rhizomes. Obtaining rhizomatous hybrid progeny becomes a prerequisite for the rhizomes study. In this work, four varieties of O. sativa and three accessions of O. longistaminata were used to carry out an incomplete diallel cross experiment. It was found that most F1 hybrids had rhizomes with varying length and numbers. Data analysis showed that the general combining ability (GCA) of the female parents had significant effect on rhizome-related trait of the F1s. Nevertheless, the GCA of the male parents and special combining ability of the hybrid combination played minor effect. And we speculated that the appropriate choice for female parents is more crucial to obtain rhizomatous hybrid. As the first incomplete diallel cross between O. longistaminata and O. sativa, this work would be benefit to appropriate parent selection for genetic research and breeding of perennial rice.

中文翻译：

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多年生野生近缘水稻与亚洲栽培稻不完全二列杂交对根茎性的结合能力分析

与一年生栽培稻相比，多年生稻在控制水土流失、省力、节水、肥水管理等方面具有很大的优势。根茎作为多年生的关键器官，可以帮助禾本科植物实现快速扩张，占用更多的环境资源，并能承受恶劣的环境条件。Oryza longistaminata 是具有旺盛根茎的水稻的多年生野生近缘种，是将多年生性转移到亚洲栽培稻 (Oryza sativa) 的理想供体。然而，一些O. longistaminata 和栽培稻之间的杂交F1 没有根状茎。获得根状茎杂种后代成为根茎研究的先决条件。在这项工作中，使用四个品种的 O. sativa 和三个品种的 O. longistaminata 进行了不完全双列杂交实验。发现大多数 F1 杂种具有不同长度和数量的根茎。数据分析表明，母本的一般配合力（GCA）对F1的根茎相关性状有显着影响。尽管如此，父本的GCA和杂种组合的特殊配合力影响不大。并且我们推测合适的母本选择对于获得根状茎杂种更为关键。作为O. longistaminata 和O. sativa 之间的第一个不完全二列杂交，这项工作将有利于多年生水稻遗传研究和育种的适当亲本选择。父本的GCA和杂交组合的特殊配合力影响较小。并且我们推测合适的母本选择对于获得根状茎杂种更为关键。作为O. longistaminata 和O. sativa 之间的第一个不完全二列杂交，这项工作将有利于多年生水稻遗传研究和育种的适当亲本选择。父本的GCA和杂交组合的特殊配合力影响较小。并且我们推测合适的母本选择对于获得根状茎杂种更为关键。作为O. longistaminata 和O. sativa 之间的第一个不完全二等位杂交，这项工作将有利于多年生水稻遗传研究和育种的适当亲本选择。