Studies on dry matter and grain production of F1 hybrid rice in China. I. Characteristics of dry matter production.

Responses of Yielding Ability, Sink Size and Percentage of Filled Grains to the Cultivation Practices in a Chinese Large-Panicle-Type Rice Cultivar, Yangdao 4

“…Consequently, a high PFG was maintained in YD even with a large sink size. This was consistent with the high percentage of T in panicle weight or yield in other large-sink cultivars (Song et al, 1990;Saitoh et al, 1991;Kusutani et al, 1993;Miah et al, 1996;Ueda et al, 2000b;Katsura et al, 2007). Moreover, the W + T in YD increased with increasing sink size, which might also contribute to the smaller decrement of PFG.…”

“…This suggested that the PFG in YD was more stable and superior to that in the Japanese cultivar HH in spite of its larger sink size. PEG in Chinese F 1 hybrid rice cultivars with larger NS-P have been reported to decrease less with increasing NS-m 2 (Song et al, 1990;Amano et al, 1996).…”

“…On the other hand, large-panicle rice cultivars including not only F 1 hybrids but also normal inbred cultivars with 150-200 spikelets panicle -1 have been bred in China in recent years and have contributed to yield increment (Song et al, 1990;Ikehashi, 1994a, 1994b;Wang et al, 1995Wang et al, , 1997Amano et al, 1993Amano et al, , 1996Katsura et al, 2007). The 1000-grain weight is also higher in these large-panicle-type cultivars than in the Japanese cultivars and tends to increase (Yamamoto et al, 2001).…”

“…However, most of these studies analyzed only the cultivar differences in yielding ability under limited cultivation conditions (Takeda et al, 1984;Song et al, 1990;Saitoh et al, 1991Saitoh et al, , 1993Wang et al, 1991;Yamamoto et al, 1991;Amano et al, 1993Amano et al, , 1996Kusutani et al, 1993;Miah et al, 1996;Shiotsu et al, 2006;Katsura et al, 2007), and few reports are available on the effects of a wide range of cultivation practices on the yielding ability (Weng et al, 1982;Komatsu et al, 1984;Kubota et al, 1988;Sumi et al, 1996). Analysis of the effects of cultivation practices on the yielding ability in relation to sink size and PFG might reveal practical information on high-yielding cultivation of these large-panicle-type cultivars.…”

Contribution of Biomass Partitioning and Translocation to Grain Yield under Sub-Optimum Growing Conditions in Irrigated Rice

“…In maize hybrids, for instance, where HI has largely remained constant, increased grain yield was a result of increased biomass production (Tollenaar and Daynard, 1982;Tollenaar, 1989;Tollenaar and Aguilera, 1991). In rice, the increased yield of F 1 hybrids was associated with increased biomass production under favorable growing conditions (Song et al, 1990;Yamauchi, 1994). Under favorable growing conditions such as intensive irrigated rice systems in the DS of the tropics where total solar radiation is high, HI of modern rice cultivars is high (45-55%) and their grain yield approaches the yield potential of 10 t ha-1 (Peng et al, 2000).…”