DOI: 10.1101/504316Dec 21, 2018Paper

Allometric scaling impacts plasticity in biomass allocation, morphology and anatomical traits due to above and belowground resource limitation in cultivated sunflower (Helianthus annuus L.)

BioRxiv : the Preprint Server for Biology
Yan WangLisa A Donovan


Under benign conditions, as plants grow, size dependent (allometric) scaling changes mass allocation between organs. In the face of resource stress plants grow less but also show plasticity in multiple trait categories, including biomass allocation, morphology and anatomy. The extent to which size dependent (allometric) vs active (beyond allometric) responses to resource limitations are consistent with expectations for increasing resource acquisition potential is poorly understood. Here we assess the impact of allometric scaling on the direction, magnitude and coordination of trait plasticity in response to light and/or nutrient limitations in cultivated sunflower (Helianthus annuus). We grew seedings of ten sunflower genotypes for three weeks in a factorial of light (50% shade) and nutrient (10% supply) limitation in the greenhouse and measured a suite of allocational, morphological and anatomical traits for leaves, stems, fine roots, and tap roots. Under resource limitation, more biomass was allocated to the organ capturing the most limiting resource, as expected. Allometric scaling accounted for a substantial portion of many trait responses, especially for anatomical traits. Allometric and active responses were generally ali...Continue Reading

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Plant Leaves
Plant Roots
Helianthus annuus

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