Dry matter production and partitioning in eight newly-developed F1 TGMS-based rice hybrids
2018
Salazar, B.T. | Talavera, M.A.A. | Ortiguerro, M.L.G. | Masajo, T.M.
The study aimed to characterize dry matter production and partitioning in recently developed F1 thermo-sensitive genetic male sterile (TGMS)-based rice hybrids of PhilRice Los Baños and UP [University of the Philippines] Los Baños. The experiment was laid out in a randomized complete block design at the UPLB [University of the Philippines Los Baños] Central Experiment Station in Dry Season 2017 with 16 entries and 4 replications per entry. Assimilate partitioning and total dry matter production was determined by getting the sample oven-dry weights, while grain yield was estimated by getting the 10 m2-plot yield. Across entries, aboveground biomass ranged from 2.5 to 4.0 g/sqm at seedling stage, 200-300 g/sqm at maximum tillering , 600-1600 g/sqm at flowering, and 1500-1800 g/sqm grain maturity. During maximum tillering, leaf blade and culm accounted for 46% and 54% respectively, of the aboveground biomass. At reproductive stage, 33% of the biomass from vegetative structures was diverted to the developing spikelet at flowering, and further to 51% to the grains at maturity. This pattern of dry matter production and partitioning in eight entries translated to a grain yield of 6.1 to 6.8 t/ha, which is comparable to the grain yield of M73, the most recently released TGMS hybrid.
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