Abstract
Tolerance to lodging is an essential trait for rice direct sowing cultivation. Effective use of semidwarfing alleles at the sd-1 locus is considered to be promising to breed high-yielding and lodging-tolerant cultivars for direct sowing. The semidwarfism of the sd-1 alleles, however, might exert adverse effects on the emergence and establishment of rice seedlings. In the present study, investigations were carried out to determine whether semidwarfism exerted adverse effects on seedling emergence and establishment under direct sowing conditions by using isolines harboring semidwarfing alleles derived from three different donor parents, Shiranui, Reimei and Taichung Native 1. It was eventually demonstrated that the semidwarfing alleles did not exert adverse effects on emergence and establishment of rice seedlings.
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