Individual and combined effects of plant height reducing genes in periwinkle |
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Authors: | R N Kulkarni K Baskaran D V Shyamaprasad Swaroop S Kulkarni |
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Institution: | (1) Central Institute of Medicinal and Aromatic Plants (Council of Scientific and Industrial Research), Resource Centre, Allalasandra, Bangalore, 560 065, India |
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Abstract: | Inheritance of an induced bushy mutant (EMS 24-5) of periwinkle (Catharanthus roseus) and its genetic relationship with an earlier reported dwarf mutant (NEU 6-15) was studied by crossing it with its parental
variety, Nirmal and the dwarf mutant. The bushy mutant was found to be under the control of a monogenic recessive gene (by), which was inherited independently of the recessive gene (dw
1
) involved in the dwarf mutant. The double mutant (bydw
1
) recombinant, which was recovered from the F2 generation of the cross (NEU 6-15) × (EMS 24-5), its parental mutants and variety, Nirmal were used for determining the individual
and combined effects of plant height reducing genes dw
1
and by. Individually, the recessive genes by and dw
1, reduced plant height by 27–30, 64–68%, respectively, while together they reduced plant height by 73–77%. The double mutant
recombinant was found to be 63–68 and 25–29% shorter than its parental mutants (EMS 24-5) and (NEU 6-15), respectively. The
effects of the recessive gene by on plant height were discernable only after the age of 4 months while those of dw
1
and combined effects of dw
1
and by became apparent one to 2 weeks after germination. The double mutant recombinant was found to have higher content of total
alkaloids in the roots than parental mutants as well as the variety, Nirmal. |
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Keywords: | |
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