Carbohydrate accumulation and remobilization of upland and lowland rice in response to water deficit at various development stages

摘要

Rice yields are most susceptible to reduction by stress at flowering (Chaturvedi et al, 1996). Drought at flowering causes irreversible loss of leaf area and reduced photosynthesis, which in turn increases the proportion of unfilled spikelets. When rice suffers flowering stage drought, grain growth is largely supported by reserve materials (carbohydrate) accumulated in culm and leaf sheath before stress and remobilized during stress (Yang et. al., 2001, Garg et. al., 2002, Cabuslay et. al., 2002, and Chaturvedi and Ingram, 1989).