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Genetic effects on the biomass partitioning and growth of Pisum and Lycopersicon¹

³ Department of Plant Biology, Cornell University, Ithaca, New York 14853 USA ⁴ Department of Botany and Plant Sciences, University of California, Riverside, California 92521 USA

ABSTRACT

We examined a series of eight pea genotypes differing in three naturally occurring allelic mutations, i.e., af (afila), st (stipules reduced), and tl (tendril-less) and three species, five cultivars, and one interspecific hybrid of tomato differing in SP (SELF-PRUNING) allele composition to determine whether different phenotypes ontogenetically express different biomass partitioning patterns compared to the isometric partitioning pattern and an interspecific 3/4 scaling "rule" governing annual growth with respect to body mass. The slopes and "elevations" (i.e., and log β, respectively) of log-log linear regression curves of bivariate plots of leaf, stem, and root dry mass and of annual growth vs. total body mass were used to assess pattern homogeneity. The annual growth of all pea and tomato phenotypes complied with the 3/4 growth rule. The biomass partitioning patterns of all tomato phenotypes were statistically indistinguishable from the isometric pattern as were those of the pea wild type and three single-mutant genotypes. However, significant departures from the isometric (and pea wild type) biomass allocation pattern were observed for three genotypes, all of which were homozygous for the af allele. These results open the door to explore the heritability and genetics underlying the allometry of biomass partitioning patterns and growth.

Key Words: af (afila) • allometry • Fabaceae • Lycopersicon esculentum • Lycopersicon pennellii • Lycopersicon pimpinellifolium • leaf morphology • Pisum sativum • scaling relationships • Solanaceae

Received for publication 27 September 2007. Accepted for publication 23 January 2008.

FOOTNOTES

¹ The authors thank Drs. M. Christianson (University of California, Berkeley), H.-C. Spatz (Freiburg University), and T. Cooke (University of Maryland), and one anonymous reviewer for providing constructive criticisms of an earlier version of this paper. Support from the College of Agriculture and Life Sciences, Cornell University is gratefully acknowledged.

² Author for correspondence (e-mail: kjn2{at}cornell.edu)

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