Dry Matter Production and Carbohydrate Accumulation in Three Meadowfoam Lines
- Timothy E. Fiez ,
- Steven Norberg and
- Gary D. Jolliff
The literature lacks information on seasonal patterns of meadow foam (Limnanthes R. Br. spp.) dry matter production and nonstructural carbohydrate quantities and their relationship with seed yield. To provide this information, three meadow foam lines (85-765, 85-729 and ‘Mermaid’) with contrasting seed yield performance were grown in 1987-1988 and 1988-1989 at the Oregon State University Schmidt Farm. Organ dry weights and leaf area indices (LAI) were measured at 13 dates in 1987-1988 and 11 dates in 1988-1989. Carbohydrates were quantified at anthesis and physiological maturity. There were no differences in season-long patterns of dry matter accumulation or leaf area development (predicted from regression equations) in either season. Maximal LAI occurred prior to flowering; LAI was less than 0.2 at last bloom each season, while averaged across lines, 35 and 40% of the seed-fill period occurred after last bloom in 1987-1988 and 1988-1989, respectively. During flowering, stems and flowers contained 283 and 148 g kg−1 ethanol-soluble carbohydrates, respectively, averaged across lines and years. Seed yield was correlated with the amount of potentially remobilizable carbohydrate accumulated during anthesis (r = 0.54, P < 0.01). Results suggest that developing seeds obtain substantial amounts of assimilate from sources other than current leaf photosynthesis.
Copyright © 1991.