Combining Ability of Drought-Tolerant Bread Wheat Genotypes for Agronomic and Physiological Traits
A combining-ability analysis is key to select desirable parents and progenies with enhanced response to selection under water-limited environments. The objective of this study was to determine combining ability for agronomic and physiological traits among distantly related drought-tolerant bread whe...
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| Format: | Article |
| Language: | English |
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MDPI AG
2022-03-01
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| Series: | Agronomy |
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| Online Access: | https://www.mdpi.com/2073-4395/12/4/862 |
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| author | Zamalotshwa Goodness Thungo Hussein Shimelis Jacob Mashilo |
| author_facet | Zamalotshwa Goodness Thungo Hussein Shimelis Jacob Mashilo |
| author_sort | Zamalotshwa Goodness Thungo |
| collection | DOAJ |
| description | A combining-ability analysis is key to select desirable parents and progenies with enhanced response to selection under water-limited environments. The objective of this study was to determine combining ability for agronomic and physiological traits among distantly related drought-tolerant bread wheat (<i>Triticum aestivum</i> L.) genotypes under well-watered (WW) and terminal-drought (TD) conditions to determine their genetic merit for breeding. Ten heat- and drought-tolerant wheat genotypes were crossed in a half-diallel mating design to generate 45 F<sub>1</sub>s, which were evaluated under WW and TD moisture regimes in rainout shelter (RS) and greenhouse (GH) environments. The following agronomic traits were assessed: days to 50% maturity (DTM), plant height (PH), spike length (SL), number of productive tillers (TN), spikelets number per spike (SPS), number of grains per spike (GPS), grain yield (GY) and thousand-kernel weight (TKW); and physiological traits (stomatal conductance (SC) and chlorophyll content index (CCI)). Variances attributable to general combining ability (GCA) and specific combining ability (SCA) were significant (<i>p</i> < 0.05) for GY, DTM, PH, SL, SPS, GPS, TKW and CCI. The parental genotypes LM72, LM81 and LM95 with positive and significant GCA effects on GY were selected to make crosses to develop high-yielding wheat genotypes for water-limited environments. Crosses LM71 × LM02, LM71 × LM81, LM82 × LM02, LM82 × LM81, LM22 × LM100, LM22 × LM81 and LM95 × LM22 were selected with positive and significant SCA effects for GY. The selected parents and crosses are valuable genetic resources for breeding and genetic advancement. |
| first_indexed | 2024-03-09T11:17:35Z |
| format | Article |
| id | doaj.art-ba561409efe84bdabadd3e82154dd707 |
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| issn | 2073-4395 |
| language | English |
| last_indexed | 2024-03-09T11:17:35Z |
| publishDate | 2022-03-01 |
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| series | Agronomy |
| spelling | doaj.art-ba561409efe84bdabadd3e82154dd7072023-12-01T00:27:13ZengMDPI AGAgronomy2073-43952022-03-0112486210.3390/agronomy12040862Combining Ability of Drought-Tolerant Bread Wheat Genotypes for Agronomic and Physiological TraitsZamalotshwa Goodness Thungo0Hussein Shimelis1Jacob Mashilo2School of Agricultural, Earth and Environmental Science (SAEES), College of Agriculture, Engineering and Science (C.A.E.S.), Discipline of Crop Science, University of KwaZulu-Natal, Scottsville, Pietermaritzburg 3209, South AfricaSchool of Agricultural, Earth and Environmental Science (SAEES), College of Agriculture, Engineering and Science (C.A.E.S.), Discipline of Crop Science, University of KwaZulu-Natal, Scottsville, Pietermaritzburg 3209, South AfricaSchool of Agricultural, Earth and Environmental Science (SAEES), College of Agriculture, Engineering and Science (C.A.E.S.), Discipline of Crop Science, University of KwaZulu-Natal, Scottsville, Pietermaritzburg 3209, South AfricaA combining-ability analysis is key to select desirable parents and progenies with enhanced response to selection under water-limited environments. The objective of this study was to determine combining ability for agronomic and physiological traits among distantly related drought-tolerant bread wheat (<i>Triticum aestivum</i> L.) genotypes under well-watered (WW) and terminal-drought (TD) conditions to determine their genetic merit for breeding. Ten heat- and drought-tolerant wheat genotypes were crossed in a half-diallel mating design to generate 45 F<sub>1</sub>s, which were evaluated under WW and TD moisture regimes in rainout shelter (RS) and greenhouse (GH) environments. The following agronomic traits were assessed: days to 50% maturity (DTM), plant height (PH), spike length (SL), number of productive tillers (TN), spikelets number per spike (SPS), number of grains per spike (GPS), grain yield (GY) and thousand-kernel weight (TKW); and physiological traits (stomatal conductance (SC) and chlorophyll content index (CCI)). Variances attributable to general combining ability (GCA) and specific combining ability (SCA) were significant (<i>p</i> < 0.05) for GY, DTM, PH, SL, SPS, GPS, TKW and CCI. The parental genotypes LM72, LM81 and LM95 with positive and significant GCA effects on GY were selected to make crosses to develop high-yielding wheat genotypes for water-limited environments. Crosses LM71 × LM02, LM71 × LM81, LM82 × LM02, LM82 × LM81, LM22 × LM100, LM22 × LM81 and LM95 × LM22 were selected with positive and significant SCA effects for GY. The selected parents and crosses are valuable genetic resources for breeding and genetic advancement.https://www.mdpi.com/2073-4395/12/4/862abiotic stresscombining abilitygene actionwheatyield componentsyield gains |
| spellingShingle | Zamalotshwa Goodness Thungo Hussein Shimelis Jacob Mashilo Combining Ability of Drought-Tolerant Bread Wheat Genotypes for Agronomic and Physiological Traits Agronomy abiotic stress combining ability gene action wheat yield components yield gains |
| title | Combining Ability of Drought-Tolerant Bread Wheat Genotypes for Agronomic and Physiological Traits |
| title_full | Combining Ability of Drought-Tolerant Bread Wheat Genotypes for Agronomic and Physiological Traits |
| title_fullStr | Combining Ability of Drought-Tolerant Bread Wheat Genotypes for Agronomic and Physiological Traits |
| title_full_unstemmed | Combining Ability of Drought-Tolerant Bread Wheat Genotypes for Agronomic and Physiological Traits |
| title_short | Combining Ability of Drought-Tolerant Bread Wheat Genotypes for Agronomic and Physiological Traits |
| title_sort | combining ability of drought tolerant bread wheat genotypes for agronomic and physiological traits |
| topic | abiotic stress combining ability gene action wheat yield components yield gains |
| url | https://www.mdpi.com/2073-4395/12/4/862 |
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