Difference in single leaf photosynthesis between old and new rice varieties. I. Single-leaf photosynthesis and its dependence on stomatal conductance.

Historical Changes in Grain Yield and Photosynthetic Rate of Rice Cultivars Released in the 20th Century in Tohoku Region

“…7). This phenomenon was previously observed by Kuroda and Kumura (1990a) and Saitoh et al (1991a) in the cultivars including those bred in the Tohoku region. Kuroda and Kumura (1990b) emphasized the importance of root activity, which might regulate water absorption and thereby lead to increased diffusive conductance.…”

“…Many different processes may limit the yield of a cultivar at different environmental conditions. Researchers have attempted to identify the dominant physiological traits which contributed to past yield increase and could be exploited in the future (Tanaka et al, 1968;Hayami, 1982Hayami, , 1983aHayami, , 1983bTakeda et al, 1983Takeda et al, , 1984Kuroda and Kumura, 1990a, 1990b, 1990cSaitoh et al, 1991aSaitoh et al, , 1991bSaitoh et al, , 1993. The new cultivars released after the 1950s have high yield potentials resulting from high photosynthetic rate per leaf area (Hayami, 1982;Takeda et al, 1983;Kuroda and Kumura, 1990a), and from greater light interception by the canopy (Tanaka et al, 1968;Saitoh et al, 1993).…”

【Short Report】Identification of Chromosome Regions Affecting Leaf Area with Rice Chromosome Segment Substitution Lines

“…Its ability is mainly determined by leaf area, photosynthetic ability per leaf area and light intercepting characters (Kuroda and Kumura, 1990;Mae, 1997). Modern rice cultivars have already inhered good light intercepting characters (Taylaran et al, 2009).…”

Varietal Differences in Photosynthetic Rates in Rice Plants, with Special Reference to the Nitrogen Content of Leaves

“…There are several reports comparing photosynthetic rate among individual leaves (Ishii, 1995;Agarie, 2003), among japonica varieties (Murata, 1961;Osada, 1966;Hayami, 1982;Kuroda and Kumura 1990a;Sasaki and Ishii, 1992), and among indica and japonica varieties and other species of Oryza (Takano and Tsunoda, 1971;Cho and Murata, 1980;Cook and Evans, 1983;Xu et al, 1997;Masumoto et al, 2004), and some clear differences have been observed among varieties, among species and among progenies derived from crosses between species. However, the photosynthetic rate is strongly infl uenced by the leaf nitrogen level (Tsuno and Shimizu, 1965;Ishihara et al, 1979;Makino et al, 1988).…”