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Genetic Analysis of Salt Tolerance in Cowpea
Abstract
Salinity is one of the main destructive abiotic stresses affecting crop production, as increasing salinity in soil and water supplies used for irrigation are result in decreased productivity for most crop plants, especially legumes. Cowpea is an important legume that is mostly grown in tropical and sub-tropical agricultural areas of the world, where soil salinity is a yield-limiting factor.
This study investigated the salinity effect on vegetative growth of a panel of representative cowpea genotypes by developing screening methods for morphologically phenotyping tolerance to salinity as a basis to identify QTLs associated with the plant survival during salt stress. Cowpea line TX2028-1-3-1 exhibited tolerance to salinity, whereas Aloka, IT99K-241-2, IT89KD-288, IT97K-556-4 TX Pink Eye, and Tx-30 were the most sensitive genotypes among the 14 genotypes studied.
An RIL (F2:10) population derived from the cross between Golden Eye California and IT98K-476-8 was used to map the genes or QTLs associated with plant survival during salt stress. All 175 RILs were phenotyped for salinity tolerance using a silica sand culture and genotyped using SNPs markers. Six QTLs for phenotyping measures of salinity tolerance including shoot length, root length, and leaf number were identified on chromosomes 9, 8, 10, 1, and 2.
Citation
Zarghami, Homa (2022). Genetic Analysis of Salt Tolerance in Cowpea. Doctoral dissertation, Texas A&M University. Available electronically from https : / /hdl .handle .net /1969 .1 /198119.