Mode of inheritance of resistance to the stalk-eyed fly (Diopsis longicornis) in rice
Loading...
Date
2017
Journal Title
Journal ISSN
Volume Title
Publisher
International Journal of Agronomy and Agricultural Research
Abstract
Stalk eyed flies (D. longicornis and D. apicalis) are pests of economic importance on rice. Of the two species of
stalk- eyed fly, D. longicornis is the most prevalent and destructive. To determine the mode of inheritance for
resistance to the stalk-eyed fly in rice in Uganda, crosses were made among eight parental lines (NERICA4,
TXD306, K85, NM7-22-11-B-P-1-1, NERICA1, NERICA6, NAMCHE2 and PAKISTAN) selected on the basis of
their response to the stalk-eyed fly, high yield and early maturity. Of the eight, four genotypes [NERICA4,
TXD306, and NM7-22-11-B-P-1-1 and K85], exhibited lower levels of deadheart occurrence and were crossed
using the North Carolina II mating design with four susceptible genotypes [NERICA1 and NERICA6, PAKISTAN,
and NAMCHE2]. Studies on combining abilities were conducted on 16 F1 hybrids along with the eight parents.
Narrow sense coefficients of genetic determination (NSCGD) were low to moderate (0.09 - 0.33) and broad sense
coefficients of genetic determination (BSCGD) were moderate to high (0.38 - 0.89) for traits studied. Both GCA
and SCA effects were significant for percentage of deadhearts. However, Baker’s ratio was less than 0.5 (0.37) for
deadhearts, indicating that both additive and non-additive gene effects were involved in resistance to the stalkeyed
fly, although non-additive gene effects were more important. NERICA4 andK85 were found to be good
general combiners for increasing resistance. The crosses Pakistan × TXD306 and NERICA1× NM7-22-11-B-P-1-1
were identified as promising lines for advancement.
Description
Keywords
Quantitative inheritance, combining ability, Gene action, Rice
Citation
Weelar, C. G., Lamo, J., Otim, M. H., Awio, B., & Ochwo-Ssemakula, M. (2017). Mode of inheritance of resistance to the stalk-eyed fly (Diopsis longicornis) in rice. International Journal of Agronomy and Agricultural Research, 10, 9-20.