利用分子标记辅助选择改良水稻保持系香味和稻瘟病抗性
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广东省重点领域研发计划(2018B020202004-01)


Improving rice blast resistance and fragrance of rice maintainer through marker-assisted selection
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    目的 优质抗病水稻保持系的获得是改良不育系品质与抗性的前提,利用分子标记辅助选择技术进行定向改良,可以加速优异水稻保持系的改良进程。方法 以‘恒丰B’、‘广8B’为轮回亲本,利用携带香味基因Badh2和抗稻瘟病基因Pita的‘B39’作为供体亲本,利用分子标记开展连续回交育种,定向改良‘恒丰B’、‘广8B’的品质和抗性性状。结果 通过多代回交选育,获得了14份BC3F2改良材料。利用改良单株系与对应的不育系测交,测保对应的小区不育等级为全不育和高不育;通过品质和抗性鉴定,改良后的目标株系香味评级为香味较浓;稻瘟病抗性均有进一步提高,经病圃鉴定表现为抗或高抗稻瘟病;稻米品质表现为米粒细长、低直链淀粉、低垩白;其他农艺经济性状与轮回亲本相似;改良后的株系遗传背景回复率在80%~90%之间,达到预期回复效果。结论 结合分子标记辅助选择的定向改良缩短了优质抗性保持系改良的育种进程,在较短时间内获得了在稻米品质、抗病性、香味性状上具有改良的新保持系,实现了‘恒丰B’、‘广8B’在香味性状和稻瘟病抗性方面的定向改良,为进一步协同改良三系杂交水稻的稻米品质和抗性提供了新的材料基础。

    Abstract:

    Objective The acquisition of high quality disease-resistant rice maintainers is the premise of improving the quality and resistance of sterile lines. The molecular marker-assisted selection (MAS) can be used for oriented breeding and accelarating the breeding process of elite rice maintainers.Method ‘Hengfeng B’ and ‘Guang 8B’ were used as recurrent parents, and ‘B39’ carrying fragrance gene Badh2 and rice blast resistance gene Pita was used as donor parent. The successive backcross breeding and MAS technology was combined to improve the quality and resistance traits of these two maintainer lines. Result Through multi-generation backcross breeding, 14 samples of BC3F2 improved materials were obtained. The improved single-plant line was tested with the corresponding sterile line, and the sterility grades of the corresponding plot were fully sterile and high sterile. Through quality and resistance identification, most of improved target strains were rated as strong aroma. The resistance to rice blast significantly improved and the disease nursery identification showed that they were resistant or highly resistant to rice blast. Rice quality was characterized by slender rice grains with low amylose content and low chalkiness. Other agronomic and economic characteristics were similar to the recurrent parent. The genetic background recovery rates of most strains were 80% to 90% which met the estimated recovery effect. Conclusion MAS shortens the process of trait improving for maintainer lines, helps acquiring improved maintainers with better quality, stronger blast resistance and fragrance, and realizes the oriented genetic improvement of ‘Hengfeng B’ and ‘Guang 8B’, which lays a foundation for further integrated improvement in rice quality and resistance of three-line hybrid rice.

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杨瑰丽,张瑞祥,王慧,陈淳,黄翠红,郑陶陶,刘永柱.利用分子标记辅助选择改良水稻保持系香味和稻瘟病抗性[J].华南农业大学学报,2022,43(3):9-17

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  • 收稿日期:2021-10-01
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  • 在线发布日期: 2022-05-10