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A Mechanistic Model for Describing Corn Plant Leaf Area Distribution

^a Dep. of Agron., Shanxi Agric. Univ., Shanxi, China
^b Dep. of Crop and Soil Environ. Sci., Virginia Tech, Blacksburg, VA 24061-0403

View larger version (58K): [in a new window]   Fig. 1. Calculated leaf area fractions (F) as a function of downward leaf rank (L) for eight data sets. Each data set represents eight different corn cultivars. Cultivar names are found in the figures. The fitted model is F = F0exp[–0.5(L – L0)2/k2] (Eq. [5]), where F = individual leaf area/plant leaf area, L0 is the downward leaf rank with the maximum area fraction of F0, and k is a constant. R is the multiple correlation coefficient from model fitting.

View larger version (55K): [in a new window]   Fig. 2. Calculated leaf area fractions (F) as a function of downward leaf rank (L) for green leaves at silking stage. Each data set represents eight corn subspecies by physical and chemical traits of kernels, namely, Z. mays L. subsp. indurata Sturt, Z. mays L. subsp. indentata Sturt, Z. mays L. subsp. amylacea Sturt, Z. mays L. subsp. saccharata Sturt, Supersweet Mutant, Z. mays L. subsp. ceratina Kulesh, Z. mays L. subsp. everta, and Z. mays L. subsp. tunicata Sturt. The fitted model is F = F0exp[–0.5(L – L0)2/k2] (Eq. [5]), where F = individual green leaf area/plant green leaf area, L0 is the downward leaf rank with the maximum area fraction of F0, and k is a constant. R is the multiple correlation coefficient from model fitting.

View larger version (25K): [in a new window]   Fig. 3. The relationship of reciprocal ratio of maximum leaf area fractions (F0) to k in the model of F = F0exp[–0.5(L – L0)2/k2] (Eq. [5]), the relative leaf area distribution model for all mature leaves on corn plants, where F = individual leaf area/plant leaf area, L0 is the downward leaf rank with the maximum area fraction of F0, k is a constant, and r is the correlation coefficient from model fitting.

View larger version (42K): [in a new window]   Fig. 4. Comparison of observed and estimated total plant leaf area for 30 corn genotypes.