Inheritance of root characters in crosses among deep-rooted and shallow-rooted rice varieties [Philippines]

• Main Author: Mao, C.X
• Format: Publication
• Language: English
• Published: College, Laguna (Philippines) 01.05.1984

The F2 data showed that dominant alleles controlled deep roots and heavy root weight in the five drought-resistant varieties, while recessive alleles controlled shallow roots and light root weight in IR20. Multiple genes with additive and dominance or oppositional effects governed root length and root number. Multiple gene with additive and equal effects controlled root thickness. Multiple gene system with dominance effects mainly controlled root weight. Broad sense heritability and coefficients of variation showed that root length, and root thickness had high heritability. Phenotypic and genotypic correlations among root characters in 30 F1, 6 F2 populations and 3 F3 families were all positive and significant at the 1% level. Variations in root and shoot characters of the parental varieties were found, and were attributed to environmental effects like seasonal effect and mechanical problems of the aeroponic system. Inadequate population size may have also contributed to the variations