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Selection of Novel Cowpea Genotypes Derived through Gamma Irradiation.

Horn LN, Ghebrehiwot HM, Shimelis HA - Front Plant Sci (2016)

Bottom Line: Cowpea (Vigna unguiculata [L.] Walp.) yields are considerably low in Namibia due to lack of improved varieties and biotic and abiotic stresses, notably, recurrent drought.Thus, genetic improvement in cowpea aims to develop cultivars with improved grain yield and tolerance to abiotic and biotic stress factors.The selected promising mutants' lines are recommended for adaptability and stability tests across representative agro-ecologies for large-scale production or breeding in Namibia or similar environments.

View Article: PubMed Central - PubMed

Affiliation: School of Agricultural, Earth and Environmental Sciences, College of Agriculture, Engineering and Science, University of KwaZulu-NatalPietermaritzburg, South Africa; Directorate of Research and Training, Plant Production Research, Ministry of Agriculture, Water and ForestryWindhoek, Namibia.

ABSTRACT
Cowpea (Vigna unguiculata [L.] Walp.) yields are considerably low in Namibia due to lack of improved varieties and biotic and abiotic stresses, notably, recurrent drought. Thus, genetic improvement in cowpea aims to develop cultivars with improved grain yield and tolerance to abiotic and biotic stress factors. The objective of this study was to identify agronomically desirable cowpea genotypes after mutagenesis using gamma irradiation. Seeds of three traditional cowpea varieties widely grown in Namibia including Nakare (IT81D-985), Shindimba (IT89KD-245-1), and Bira (IT87D-453-2) were gamma irradiated with varied doses and desirable mutants were selected from M2 through M6 generations. Substantial genetic variability was detected among cowpea genotypes after mutagenesis across generations including in flowering ability, maturity, flower and seed colors and grain yields. Ten phenotypically and agronomically stable novel mutants were isolated at the M6 each from the genetic background of the above three varieties. The selected promising mutants' lines are recommended for adaptability and stability tests across representative agro-ecologies for large-scale production or breeding in Namibia or similar environments. The novel cowpea genotypes selected through the study are valuable genetic resources for genetic enhancement and breeding.

No MeSH data available.


Related in: MedlinePlus

Common insect pests (A) Spiny brown bugs Clavigralla sp., (B) Coreid bug Anoplocnemis curvipes, (C) Aphids Aphis craccivora Koch and Blister (D) Beetle Mylabris phalerata observed among the M5 mutants at Bagani, and Omahenene Research Stations concurrently.
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Figure 6: Common insect pests (A) Spiny brown bugs Clavigralla sp., (B) Coreid bug Anoplocnemis curvipes, (C) Aphids Aphis craccivora Koch and Blister (D) Beetle Mylabris phalerata observed among the M5 mutants at Bagani, and Omahenene Research Stations concurrently.

Mentions: The present study demonstrated that most characters of cowpea which are of interest to plant breeders can be altered through mutations using the gamma irradiation technique. Furthermore, new plant attributes were created in the high yielding and well adapted local cowpea varieties. Various pests were observed on mutant cowpea during this study Figure 6. Therefore, there is a need to breed for insect pest tolerance in cowpea. Timko et al. (2007) suggested that the future of cowpea improvement programs should focus on breeding for pests and diseases resistance and other desirable traits such as early maturity, photoperiod insensitivity, suitable plant type, seed quality and yield. Overall, the present study made extensive phenotypic selections of mutants from the M2 to M5 generations and identified promising genotypes. The selected mutants’ are recommended for adaptability and stability tests across representative agro-ecologies for large-scale production or breeding in Namibia or similar environments. The novel cowpea genotypes selected through the study are valuable genetic resources for genetic enhancement and breeding.


Selection of Novel Cowpea Genotypes Derived through Gamma Irradiation.

Horn LN, Ghebrehiwot HM, Shimelis HA - Front Plant Sci (2016)

Common insect pests (A) Spiny brown bugs Clavigralla sp., (B) Coreid bug Anoplocnemis curvipes, (C) Aphids Aphis craccivora Koch and Blister (D) Beetle Mylabris phalerata observed among the M5 mutants at Bagani, and Omahenene Research Stations concurrently.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4834446&req=5

Figure 6: Common insect pests (A) Spiny brown bugs Clavigralla sp., (B) Coreid bug Anoplocnemis curvipes, (C) Aphids Aphis craccivora Koch and Blister (D) Beetle Mylabris phalerata observed among the M5 mutants at Bagani, and Omahenene Research Stations concurrently.
Mentions: The present study demonstrated that most characters of cowpea which are of interest to plant breeders can be altered through mutations using the gamma irradiation technique. Furthermore, new plant attributes were created in the high yielding and well adapted local cowpea varieties. Various pests were observed on mutant cowpea during this study Figure 6. Therefore, there is a need to breed for insect pest tolerance in cowpea. Timko et al. (2007) suggested that the future of cowpea improvement programs should focus on breeding for pests and diseases resistance and other desirable traits such as early maturity, photoperiod insensitivity, suitable plant type, seed quality and yield. Overall, the present study made extensive phenotypic selections of mutants from the M2 to M5 generations and identified promising genotypes. The selected mutants’ are recommended for adaptability and stability tests across representative agro-ecologies for large-scale production or breeding in Namibia or similar environments. The novel cowpea genotypes selected through the study are valuable genetic resources for genetic enhancement and breeding.

Bottom Line: Cowpea (Vigna unguiculata [L.] Walp.) yields are considerably low in Namibia due to lack of improved varieties and biotic and abiotic stresses, notably, recurrent drought.Thus, genetic improvement in cowpea aims to develop cultivars with improved grain yield and tolerance to abiotic and biotic stress factors.The selected promising mutants' lines are recommended for adaptability and stability tests across representative agro-ecologies for large-scale production or breeding in Namibia or similar environments.

View Article: PubMed Central - PubMed

Affiliation: School of Agricultural, Earth and Environmental Sciences, College of Agriculture, Engineering and Science, University of KwaZulu-NatalPietermaritzburg, South Africa; Directorate of Research and Training, Plant Production Research, Ministry of Agriculture, Water and ForestryWindhoek, Namibia.

ABSTRACT
Cowpea (Vigna unguiculata [L.] Walp.) yields are considerably low in Namibia due to lack of improved varieties and biotic and abiotic stresses, notably, recurrent drought. Thus, genetic improvement in cowpea aims to develop cultivars with improved grain yield and tolerance to abiotic and biotic stress factors. The objective of this study was to identify agronomically desirable cowpea genotypes after mutagenesis using gamma irradiation. Seeds of three traditional cowpea varieties widely grown in Namibia including Nakare (IT81D-985), Shindimba (IT89KD-245-1), and Bira (IT87D-453-2) were gamma irradiated with varied doses and desirable mutants were selected from M2 through M6 generations. Substantial genetic variability was detected among cowpea genotypes after mutagenesis across generations including in flowering ability, maturity, flower and seed colors and grain yields. Ten phenotypically and agronomically stable novel mutants were isolated at the M6 each from the genetic background of the above three varieties. The selected promising mutants' lines are recommended for adaptability and stability tests across representative agro-ecologies for large-scale production or breeding in Namibia or similar environments. The novel cowpea genotypes selected through the study are valuable genetic resources for genetic enhancement and breeding.

No MeSH data available.


Related in: MedlinePlus