Change of adaptive plasticity of Oryza rufipogon Griff. in response to variation of growth habitats
2010
Kariali, E. | Patel, S. | Panigrahi, R. | Mohapatra, P.K.
We assessed the margin of plasticity in assimilate partitioning between plant organs in three ecotypes of Oryza rufipogon Griff. living in dryland, lowland and deep water habitats and in each ecotype grown in three simulated habitats resembling the natural habitats. Growth duration, biomass and grain yield and assimilate concentration of reproductive organs were low in the dryland ecotype, but high in the other two ecotypes, although the proportion of biomass partitioned to panicle declined. Simulated habitats were beneficial for shoot dry matter production of dryland ecotype but not always for the other two; shoot biomass did not improve, when deep water ecotype was placed in simulated conditions. The pattern of distribution of assimilates or dry matter between the organs of the ecotypes did not differ between the natural and simulated conditions. Thus, difference in morphological attributes of the ecotypes was mostly determined by variation of environmental conditions irrespective of any variation accrued in the genotype owing to adaptation in the habitat. The adaptivf plasticity of Oryza rufipogon resulting in morphological divergence of the species across the gradation of habitats may be a trait useful for rice agronomy.
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