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Inheritance and molecular mapping of a gibberellin-insensitive dwarf mutant in groundnut (Arachis hypogaea L.)
Suvendu Mondal1, Anand M Badigannavar, S F D'Souza
1Nuclear Agriculture and Biotechnology Division, Bhabha Atomic Research Centre (BARC), Mumbai, 400085, India. suvenduhere@yahoo.co.in
Abstract:
A dark green dwarf mutant, TGM 167, was isolated from a gamma ray + sodium azide mutagenized population of cultivated groundnut breeding line, TFDRG 5. The mutant had a 45.8% reduction in height due to its shorter internodal length. Further, it was found to be insensitive towards exogenous GA(3) application, although it had nearly the same level of endogenous GA(3) as the parent. Genetic analysis revealed that the dwarfism is under the control of a single dominant gene. This dominant dwarfing gene was mapped with an SSR marker TC3H02 at a distance of 9.7 cM.
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01:20Monohybrid Crosses
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02:27Trihybrid Crosses
Some of Mendel’s crosses examined three pairs of contrasting characteristics. Such a cross is called a trihybrid cross. A trihybrid cross is a combination of three individual monohybrid crosses. For example, plant height (tall vs. short), seed shape (round vs. wrinkled), and seed color (yellow vs. green).
The F1 generation plants of a trihybrid cross are heterozygous for all three traits and produce eight gametes. Upon self-fertilization, these gametes have an equal chance to...