Varietal difference in seedling establishment of water-sown rice at cool temperature.

本研究通过田间试验对28个不同来源品种的成苗率进行了评价。在低温条件下，葡萄牙Arroz-da-terra和中国Sakuzairai品种显著优于日本品种。这些品种可能是育种计划中有用的遗传资源。被测试的马达加斯加品种没有表现出更好的表现。成苗率受第1叶出苗率(3/1)的影响。3/1与生根密切相关。但与枝条伸长的相关系数不显著。在育苗水稻品系的筛选中，需要一个更好的标准来评价根系锚固能力。

The present study evaluated the seedling establishment of 28 varieties of diverse origin in field trials. Varieties Arroz-da-terra from Portugal and Sakuzairai from China were significantly superior to Japanese varieties at cool temperatures. Those varieties may be useful genetic sources in breeding programs. Madagascar varieties tested did not exhibit superior performance. Percentage establishment was affected by percentage of 3rd-leaf emergence of the seedlings emerged 1st leaf (3/1). 3/1 was closely correlated with rooting in a laboratory test. However, correlation coefficients for shoot elongation were not significant. In screening of rice lines for seedling establishment, a better criterion for evaluating root anchorage is needed.