Abstract
Allometric partitioning theory showed that root biomass (MB) scales in a nearly isometric manner with respect to shoot biomass (MA) for natural plants. Artificial selection has fundamentally transformed plants; for example, the biomass allocation pattern has changed in grain crops. This study investigated 32 genotypes from 20 grain crop species to test the effects of domestication and seed size on the scaling relationship of MB vs. MA for grain crops. The scaling exponent of MB vs. MA during 30 days of growth was 0.937 across the 32 grain crop genotypes, 0.999 for the dicotyledons and 1.034 for the monocotyledons. Based on the 95% CIs of the MB vs. MA scaling exponent (RMA) of the data sets for the 32 genotypes, eight values exceeded 1.0, nine values were less than 1.0 and the remaining 15 values were statistically indistinguishable from 1.0. Seed size was positively correlated with the scaling exponents of MB vs. MA for the 32 genotypes (P<0.05), which means large-seeded species generally had more potential for allocating biomass to roots during the seedling stage. These findings suggest that a uniform isometric relationship exists in grain crop species and that artificial selection in crop species has not changed this relationship. In addition, larger seeds are an evolutionarily-stable strategy based on high grain yield per area.
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Claims 9
Claim · model-written summary
Root versus shoot biomass scaling exponent across 32 grain crop genotypes was 0.937 during 30 days of growth.
- Taxon
- grain crope0
- Material
- 32 grain crop genotypese0
- Organ / stage
- 30 days of growthe0
- Outcome
- scaling exponent of MB vs. MAe0
- Value
- 0.937e0
Not reportedDirection
Verbatim
e0“The scaling exponent of MB vs. MA during 30 days of growth was 0.937 across the 32 grain crop genotypes”
Claim · model-written summary
The root versus shoot biomass scaling exponent was 0.999 for dicotyledons.
Not reportedDirection
Verbatim
e0“0.999 for the dicotyledons”
e1“The scaling exponent of MB vs. MA during 30 days of growth was 0.937 across the 32 grain crop genotypes”
t0“Different Grain Crops”
Claim · model-written summary
The root versus shoot biomass scaling exponent was 1.034 for monocotyledons.
Not reportedDirection
Verbatim
e0“1.034 for the monocotyledons”
e1“The scaling exponent of MB vs. MA during 30 days of growth was 0.937 across the 32 grain crop genotypes”
t0“Different Grain Crops”
Claim · model-written summary
Eight genotype scaling exponents exceeded 1.0.
Verbatim
e0“eight values exceeded 1.0”
t0“Different Grain Crops”
Claim · model-written summary
Nine genotype scaling exponents were below 1.0.
Verbatim
e0“nine values were less than 1.0”
t0“Different Grain Crops”
Claim · model-written summary
Fifteen genotype scaling exponents were statistically indistinguishable from 1.0.
Verbatim
e0“the remaining 15 values were statistically indistinguishable from 1.0”
t0“Different Grain Crops”
Claim · model-written summary
Seed size was positively correlated with root versus shoot biomass scaling exponent across 32 genotypes.
Verbatim
e0“Seed size was positively correlated with the scaling exponents of MB vs. MA for the 32 genotypes (P<0.05)”
t0“Different Grain Crops”
Claim · model-written summary
The authors inferred a uniform isometric relationship in grain crop species despite artificial selection.
Verbatim
e0“a uniform isometric relationship exists in grain crop species and that artificial selection in crop species has not changed this relationship”
Claim · model-written summary
The authors interpreted larger seeds as an evolutionarily stable strategy tied to high grain yield per area.
Not reportedDirection
Verbatim
e0“larger seeds are an evolutionarily-stable strategy based on high grain yield per area”
t0“Grain Crops”