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Inheritance of plant elongation ability at seedling stage in rice

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Summary

In a comparison of methods to study inheritance of plant elongation ability, 15-, 20-, 25-, 30-, and 35-day-old F2 populations of a cross between Baisbish (floating variety) and IR42 (nonelongating semidwarf modern variety) of rice, (Oryza sativa L.) were subjected to 65 cm water depth for 7 days. Frequency distribution of plant height before and after submergence was obtained. Bimodal curves in 15-, 20- and 25-day-old populations gave good fits to 9:7 elongating: nonelongating plants, suggesting that elongation was due to two dominant complementary genes. Segregation in the 30-day-old population was not clear-cut. A seedling age of 20 days was subsequently chosen for further studies.

Two F2's involving floating rice and a nonelongating semidwarf; four F2's involving floating rice and an elongating semidwarf; and two F2's involving elongating and nonelongating semidwarf parents were studied with 20-day-old seedlings in the same way. Floating rice combinations with nonelongating semidwarf parents as well as with elongating semidwarf parents segregated into 9:7 elongating: nonelongating ratio. It is possible that because elongating and nonelongating dwarf parents did not differ much in elongation ability at seedling age, their combination with floating rice parents provided similar segregation. The F2 distributions for height in elongating and nonelongating dwarf cross combinations were continuous with one peak.

Genetic constitution of parents proposed are Sd1 Sd1 El El for floating parents, sd1 sd1 El El for semidwarf elongating, and sd1 sd1 el el for dwarf nonelongating.

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Authors and Affiliations

  1. The International Rice Research Institute, P.O. Box 933, Manila, Philippines

    R. Thakur & D. Hille Ris Lambers

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  1. R. Thakur
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  2. D. Hille Ris Lambers
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Thakur, R., Hille Ris Lambers, D. Inheritance of plant elongation ability at seedling stage in rice. Euphytica 41, 227–233 (1989). https://doi.org/10.1007/BF00021589

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  • DOI: https://doi.org/10.1007/BF00021589

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