Inheritance of aroma and breadthwise grain expansion in Basmati and non-Basmati rices
1994
Vivekanandan, P. | Giridharan, S. (Tamil Nadu Rice Research Inst., Aduthurai 612101, Tamil Nadu (India))
Results of the study on inheritance of aroma showed that all F1 plants were nonaromatic, indicating that aroma was recessive. F2 of two crosses, ADT37/Pusa Basmati 1 and IR50/Pusa Basmati 1, segregated into 3 nonaromatic: 1 aromatic, suggesting monogenic inheritance that was confirmed in BC1 and BC2 generations. Cross combinations TKM9/Pusa Basmati 1, ADT39/Pusa Basmati 1, and Improved White Ponni/Pusa Basmati 1 segregated into a 15-1 ratio for nonaromatic and aromatic in F2, indicating digenic inheritance that was confirmed in BC1 and BC2 generations. Results of inheritance of breadthwise grain expansion showed that bold-grained parents TKM9 and ADT37 recorded the least breadthwise expansion. The mean value of F1 toward minimum breadthwise expansion indicated its dominance over maximum breadthwise expansion. BC1 with the better parent produced less breadthwise expansion than BC2 with the other parent. Additive, dominance, and dominance x dominance effects were significant. The h and l effects had opposite signs, revealing the presence of duplicate gene action. Effective factors ranged from 1 to 18. Because additive gene action is present, the pedigree breeding method is recommended. Dominance and epistatic interactions were also seen; selection in later generations with one or two cycles of intermating selected segregants will result in lessening breadthwise grain expansion
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