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Mesocotyl Elongation is Essential for Seedling Emergence Under Deep-Seeding Condition in Rice

Background Direct-seeding cultivation by deep-seeding of seeds (drill seeding) is becoming popular due to the scarcity of land and labor. However, poor emergence and inadequate seedling establishment can lead to yield loss in direct-seeding cultivation by deep-sowing. In rice, mesocotyl and coleoptile are primarily responsible for seedling emergence from deeper levels of soil...

QTL Mapping of Grain Quality Traits Using Introgression Lines Carrying Oryza rufipogon Chromosome Segments in Japonica Rice

Background Improved eating quality is a major breeding target in japonica rice due to market demand. Consequently, quantitative trait loci (QTL) for glossiness of cooked rice and amylose content associated with eating quality have received much research focus because of their importance in rice quality. Results In this study, QTL associated with 12 grain quality traits were...

High-density mapping of quantitative trait loci for grain-weight and spikelet number in rice

Background High grain yield is one of the most important traits requiring improvement in rice breeding programs. Consequently, the genetic basis of spikelets per panicle (SPP) and grain weight (TGW) have received much research focus because of their importance in rice yield. Results In this study, IL28, which is a near isogenic line (NIL) developed by introgressing chromosomal...

Mapping and characterization of quantitative trait loci for mesocotyl elongation in rice (Oryza sativa L.)

a Scientific Research grant for a foreign student (Hyun-Sook Lee) from the Ministry of Education, Culture and Science, Japan. The authors thank Dr. Atsushi Higashitani (Graduate School of Life

QTL mapping reveals a tight linkage between QTLs for grain weight and panicle spikelet number in rice

Background A number of QTL studies reported that one genomic region was associated with several traits, indicating linkage and/or pleiotropic effects. The question of pleiotropy versus tight linkage in these studies should be solved using a large-size population combined with high-density mapping. For example, if each of the 2 parents has a TGW-increasing or SPP-increasing QTL...