Study of Gene Effects for Stalk Sugar Yield and Its Component Traits in Sweet Sorghum [Sorghum bicolor (L.) Moench] Using Generation Mean Analysis

Document Type: Research and Full Length Article

Authors

1 Acharya N. G. Ranga Agricultural University, Agricultural College, Andhra Pradesh

2 BInternational Crops Research Institute for the Semi-Arid Tropics, Patancheru, Hyderabad

3 International Crops Research Institute for the Semi-Arid Tropics, Patancheru, Hyderabad

Abstract

Generation mean analysis was carried out to estimate the nature and
magnitude of gene effects for sugar yield and its component traits in sweet sorghum
[Sorghum bicolor (L.) Moench. Six basic generations, namely P1, P2, F1, F2,
BC1P1, BC1P2 of four crosses involving seven diverse parents were evaluated in
rainy 2009. The mean performance of the F1 in all the crosses indicated dominant
gene effect for all the characters. Simple additive-dominance model indicated
presence of epistatic interaction. High positive additive × additive interaction effects
were found in all the crosses. Higher magnitude of dominance and dominance ×
dominance gene interactions which were found minimizes the expression of
heterosis leading to non-exploitation of crosses with duplicate epistasis. Reciprocal
recurrent selection and/or biparental mating in early segregating generations has
been suggested for development of high sugar yielding genotypes in view of the
genotypes studied.

Keywords