Inheritance of Dwarfism in Pigeonpea (Cajanus Cajan (L) Millsp.)

Githiri, S. Mwangi (1988) Inheritance of Dwarfism in Pigeonpea (Cajanus Cajan (L) Millsp.). Masters thesis, University of Nairobi.

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Inheritance of dwarfism was studied in pigeonpea in F1, F2 F3 and test cross generations involving three medium maturing dwarf mutants (Dg, PD^ PBNA), that grow to a height of about a metre and four normal height genotypes: ICPL 1 (Early), BDN 1 (Medium), ICPL 366 and NP (WR) 15 (Late). Growth analyses of Dg and BDN 1 were carried out by taking measurements on non-destructive parameters (plant height, internode numbers, and number of branches) every 12 days and on destructive parameters (nodulation, and shoot and root dry weights) every 24 days. The results showed that the dwarf mutants had fewer and shorter internodes, and more secondary and tertiary branches than the normal tall plants. The Dg dwarf had lower dry matter production. However, its growth pattern and nodulation was similar to the normal cultivar, BDN 1. The showed that the normal ' plant phenotype was completely dominant to the dwarf phenotype. Dwarfism was inherited as a monogenic recessive trait. The three dwarf cultivars were noted to be mutants at the same locus. D6 and PD1 dwarfs had similar alleles which were designated as t3, while PBNA had different alleles which wore designated as t3. In crosses among the dwarfs, the t3 alleles wore found to be dominant to the t3 alleles. A wide range in plant height was observed for the F2 and F3 generations thus suggesting that environmental conditions and modifiers ware involved in the expression of height.

Item Type: Thesis (Masters)
Subjects: S Agriculture > SB Plant culture
Divisions: Africana
Depositing User: Geoffrey Obatsa
Date Deposited: 27 Sep 2016 13:25
Last Modified: 27 Sep 2016 14:34

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