Effects of Non-Structural Carbohydrates on Spikelet Differentiation in Rice

Relationship between Dry Weight at Heading and the Number ofSpikelets on Individual Rice Tillers

“…In data of Yao et al (2000b), we found that shading decreased SP compared to regression of SP on the amount of nitrogen per panicle, but did not affect the relationship between SP and DWP, which also suggests that dry matter production is more essential to spikelet production than the amount of nitrogen. The fact that SP is reduced by shading (Matsushima, 1957;Yao et al, 2000b) supports our conclusion because shading decreases dry weight, but not the amount of nitrogen, per hill (Kobayasi et al, 2001c). Dry matter production per panicle is related to SP (Kobata and Notsu, 1991;Yao et al, 2000a), but the relationship between DWT and ST has not been reported.…”

“…The involvement of photosynthesis suggests that carbohydrate might be a mediator. However, the content of carbohydrate (Mohapatra and Sahu, 1991;Kobayasi et al, 2001c;Ding and Maruyama, 2004), phosphate, and amino acids (Mohapatra and Sahu, 1991) were unrelated to spikelet production. Nevertheless, appropriate measurements conducted at the proper time may yet reveal the role of a carbohydrate.…”

“…4), although ST dif was lower in the THIN group than in the GA group. This suggests that ST was determined irrespective of ST dif , although Kobayasi et al (2001c) proposed that the promotion of spikelet differentiation would result in an increase in S and Yao et al (2000b) considered that the number of surviving spikelets per panicle depends on the number of differentiated spikelets per panicle.…”

Dry Matter and N Contributions to the Formation of Sink Size in Early- and Late-maturing Rice under Various N Rates in Central China

“…Kobayashi et al (2001) and Ding and Maruyama (2004) concluded that spikelet differentiation was not influenced by non-structural carbohydrates contents in the stem or panicle. However, CO2 enrichment experiments demonstrated that sink size was increased under high CO2 concentration (Yoshida, 1973;Kim et al, 2010).…”

“…4). Similarly, the much longer reproductive stage could result in significantly more kernel number (m -2 ) in wheat, which was due to the increase in dry matter production (Fischer, 1985;Kobayashi et al, 2001). …”