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Carbon Dioxide Assimilation Efficiency Of Maize Leaves Under Nitrogen Stress At Different Stages Of Plant Development, John Settimi, Jerry Maranville
Carbon Dioxide Assimilation Efficiency Of Maize Leaves Under Nitrogen Stress At Different Stages Of Plant Development, John Settimi, Jerry Maranville
John R. Settimi
Sub-optimal nitrogen (N) affects the N-rich carbon dioxide (CO2) assimilation enzymes which can limit maize (Zea mays) production. The status of the carboxylation system is closely correlated to the Assimilation Efficiency Index (AEI) which is the initial slope of the CO2 assimilation rate versus intercellular leaf CO2 concentrations. Experiments were undertaken to ascertain the effect of soil N nutrition on the AEI, determine genotypic variability for AEI under N-deficiency, determine how leaf and plant development affect treatment differences, and examine correlations between the AEI and plant development. Studies were conducted in the field and greenhouse on five maize genotypes on …
Fractal Analysis For Morphological Description Of Corn Roots Under Nitrogen Stress, John Settimi, Bahman Eghbal, Jerry Maranville, Anne Parkhurst
Fractal Analysis For Morphological Description Of Corn Roots Under Nitrogen Stress, John Settimi, Bahman Eghbal, Jerry Maranville, Anne Parkhurst
John R. Settimi
A means of quantification of plant root branching, specifically under stress, is of importance for evaluating the contribution of plant roots to water and nutrient uptake and subsequently plant growth. An experiment was conducted to describe the morphology of corn (Zea mays L.) root systems using fractal analysis and also to determine if a roots fractal dimension (D) is altered by N stress. Corn genotypes (B73 ✕ LHI05 and N74 ✕ Mo17) were planted in peg boxes, 1.2 m long, 1.2 m deep, and 0.05 m wide filled with 20:80 soil to sand mixture and were grown with N rates …