The effect of planting pattern on the rate of photosynthesis and related processes during ripening in rice plants

Performance of a High-Yielding Modern Rice Cultivar Takanari and Several Old and New Cultivars Grown with and without Chemical Fertilizer in a Submerged Paddy Field

“…14). These observations suggest that the characteristics of the root systems in the new cultivars, in particular Takanari, might be attributed to the greater accumulation of nitrogen (Ookawa et al, 2004;San-oh et al, 2006b) although the increase in root dry weight and root length did not result in the promotion in nitrogen absorption in some cultivars (Samejima et al, 2005). This hypothesis remains to be confirmed.…”

“…This hypothesis remains to be confirmed. It has been reported that the accumulation of nitrogen and movement of cytokinins from roots to shoots are enhanced in plants with a large amount of roots (Soejima et al, 1995;Ookawa et al, 2004;San-oh et al, 2006b). The characteristics of the large amount of roots might affect the duration of ripening through higher cytokinin activities (Oritani, 1995;Soejima et al, 1995;Ookawa et al, 2004).…”

Effects of Soil Temperature on Growth and Root Function in Rice

“…In addition, increased levels of ABA and decreased levels of cytokinins in shoots were observed when shoot growth was retarded at high soil temperatures in grass (Liu and Huang, 2005). Cytokinin was associated with the maintenance of photosynthetic rate in rice (Ookawa et al, 2004;San-oh et al, 2006;Soejima et al, 1992Soejima et al, , 1995. Then, in this study, the interactive effect of ABA and cytokinins would relate to the decrease in photosynthesis, which contribute to the decline in dry weight of shoot and root under high soil temperature stress.…”

Impact of Water Management on Rice Varieties, Yield, and Water Productivity under the System of Rice Intensification in Southern Taiwan

“…For instance, under CF conditions [57], found that rice yield was higher when single seedlings per hill were transplanted compared with three seedlings per hill. The explanation in support was that single plants per hill had higher cytokinin concentration in their roots during the late reproductive stage compared with plants grown using three seedlings per hill.…”