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International Research Journal of Plant Science

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A genetic basis of reaction norm evolution in density and/or year response of early vegetative plant architecture using recombinant-inbred lines derived from the cross between annual-form-wild and cultivated rice under changeable natural climate across years

Abstract

Youki Itoh and Yoshikazu Sato

Reaction norm (RN) is defined as the form expressed by set of phenotypes that can be produced by a genotype exposed to different environmental conditions. To empirically examine genetic basis of RN under natural climates, quantitative trait locus (QTL) analysis was performed on genotypic mean under a condition and several phenotypic-plasticity (PP) indexes associated with density and/or year response of early vegetative plant architecture in rice. Recombinant inbred lines, derived from a cross between an annual-form-wild (AFW) and a cultivated rice, were grown under two-density conditions in two years. The present study provided three-significant results with some major theories of RN evolution. (1) Most of PP-type QTLs were associated with slope itself of RN rather than QTL responding to a specific condition regardless of genotype. (2) Further, three-fourth of estimated QTLs associated with density response behaved in year-condition-dependent manners. (3) In linkage analysis, QTLs that AFW-rice-derived allele contributed to an increase of PP tended to be linked each other, while QTLs that cultivated-rice-derived allele contributed to it tended to be scattered over several chromosomes. We discussed genetic mechanisms of RN evolution mainly based on the three results.

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