Evaluation of yield performance in rice near-isogenic lines with increased spikelet number

Agronomic Traits for High Productivity of Rice Grown in Aerobic Culture in Progeny of a Japonica Cultivar and a High-Yielding Indica Cultivar

“…This means that Habataki and many CSSLs had efficient spikelet production per unit nitrogen uptake. In a previous study, the spikelet number in Habataki and some of its CSSLs responded more strongly to nitrogen application than that in Sasanishiki (Ohsumi et al, 2011). These results suggest that vigorous nitrogen uptake by rice plants in aerobic culture would enable most of the CSSLs to produce more spikelets per unit area than Sasanishiki.…”

“…Habataki has a higher photosynthetic rate than Sasanishiki (Adachi et al, 2011;Ohsumi et al, 2011) and a larger spikelet number per panicle (Ando et al, 2008;Ohsumi et al, 2011), which led to higher grain yield in Habataki (Katsura and Nakaide, 2011). Therefore, most of the CSSLs would be expected to show a higher grain yield than Sasanishiki, because the CSSLs have chromosome regions containing one or more QTLs for grain yield from Habataki.…”

“…4). Ohsumi et al (2011) demonstrated that increased spikelet number resulted in a decrease in single-grain weight because of source limitations, using near-isogenic lines with increased spikelet number. In the present study, the large source of photosynthate produced by the large biomass in aerobic culture would alleviate the decrease in single-grain weight in most of the CSSLs relative to that in Sasanishiki.…”

Varietal Differences in Cell Wall β-(1→3),(1→4)-Glucan and Nonstructural Carbohydrate in Rice Stems during the Grain Filling Stage

“…In addition, there was a positive correlation between the decrease in the amount of NSC and increase in panicle weight (data not shown). It was clarified that the enlargement of sink size may have enhanced NSC translocation to some extent using Sasanishiki and its near isogenic lines introduced with QTLs for increasing grain number that were derived from Habataki (Ohsumi et al, 2011). The decrease in the amount of NSC was higher in high yield Takanari compared with standard Nipponbare (Xu et al, 1997).…”

High-Resolution Inflorescence Phenotyping Using a Novel Image-Analysis Pipeline, PANorama

“…Thus, panicle size, shape, and branching patterns are thought to directly impact grain uniformity and quality (Yoshida and Nagato, 2011). Additionally, tradeoffs between sink and source tissues in rice often translate into direct compensation in the number of seeds or grains per plant (Ohsumi et al, 2011). For example, although large panicles often carry more spikelets, overall seed and grain sizes usually diminish.…”