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QTL Analysis of Agronomic Traits and Intracellular Substances Related to Cold Tolerance in Rice (Oryza sativa L.)

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주제분류농학

초록

Abstract

Cold acclimation of plants is a highly active process resulting from the expression of a number of physiological and metabolic adaptations to low temperature. Major metabolic changes in carbohydrates, protein, nucleic acids, amino acids, and growth regulators have been documented during the acquisition of cold tolerance. Among these, water-soluble carbohydrate (WSC) and some amino acids were shown to accumulate during cold acclimation of grass species. To determine QTLs associated with agronomic traits and the intracellular substances related to cold tolerance in rice, a molecular map consisted of 106 SSR and 26 AFLP markers has been developed using a recombinant inbred population of F8 generation derived from a cross between Dasanbyeo, a Tongil type cultivar, and TR22183, a Chinese japonica variety. The total map unit was 1,275 cM with an average distance of 9.6 cM. Most of the traits examined approximately fitted in normal distribution. The number of significant QTLs (LOD??2.0) affecting each trait ranged from one to five, a total of thirty-nine QTLs were detected from 23 traits. The QTLs derived from 23 traits explained 7.4 to 26.4% of total phenotypic variance.

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