繁殖世代对水稻植株农艺性状及稻米品质的影响研究

以国家长期库躬存种质为对照，选择在生产上一直种植的同一品种为高繁殖世代材料，一起进行田间种植以了解两者之间在田间出苗率、生育期、植株农艺性状及稻米品质上是否存在差异。结果表明，在6个供试粳稻品种中，有5个品种的高繁殖世代种质，其稻米垩白品质出现了退化现象，而其他稻米品质特性没有出现明显的变化。来自库存的种质，其每穗粒数都比一直在生产上种植的种质少，这可能与母本长时间低温贮藏有关。此外，来自库存的种质，其田间出苗率也相对较低。

Effect of Regeneration Times on Agronomic Traits and Grain Quality of Rice

Six identical japonica rice varieties from two sources were cultivated in the field. One set was from seeds stored in the National Long-term Genebank and was used as the control, and the other was from the seeds having higher regeneration cycles and being used in the production all along. Differences between the two sources on seedling emergence rate, growth duration, agronomic traits and grain quality were studied. Deterioration in chalky quality was observed for rice of higher regeneration cycles on five of the six varieties, whereas no significant differences were shown for other quality traits. On the other hand, the number of filled grains per panicle was lower for those from the genebank, indicating that long time storage in low temperature might result in a decline of grain number. In addition, emergence rate of stored seeds was also relatively lower than that of higher regeneration cycles.