Wheat Cultivars With Contrasting Root System Size Responded Differently to Terminal Drought
In the Mediterranean-type environment of Australia and other parts of the world, end-of- season or terminal drought is the most significant abiotic stress affecting wheat grain yields. This study examined the response of two wheat cultivars with contrasting root system size to terminal drought and t...
| Main Authors: | , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Frontiers Media S.A.
2020-08-01
|
| Series: | Frontiers in Plant Science |
| Subjects: | |
| Online Access: | https://www.frontiersin.org/article/10.3389/fpls.2020.01285/full |
| _version_ | 1818525106625839104 |
|---|---|
| author | Victoria Figueroa-Bustos Jairo A. Palta Jairo A. Palta Yinglong Chen Katia Stefanova Kadambot H. M. Siddique |
| author_facet | Victoria Figueroa-Bustos Jairo A. Palta Jairo A. Palta Yinglong Chen Katia Stefanova Kadambot H. M. Siddique |
| author_sort | Victoria Figueroa-Bustos |
| collection | DOAJ |
| description | In the Mediterranean-type environment of Australia and other parts of the world, end-of- season or terminal drought is the most significant abiotic stress affecting wheat grain yields. This study examined the response of two wheat cultivars with contrasting root system size to terminal drought and the effect of terminal drought on grain yield and yield components. The cultivars were grown in 1.0 m deep PVC columns filled with soil in a glasshouse under well-watered conditions until the onset of ear emergence (Z51) when well-watered and terminal drought treatments were imposed. Terminal drought reduced stomatal conductance, leaf photosynthesis, and transpiration rates faster in Bahatans-87 (larger root system size) than Tincurrin (smaller root system size). Terminal drought reduced grain yield in both cultivars, more so in Bahatans-87 (80%) with the large root system than Tincurrin (67%) with the small root system, which was mainly due to a reduction in grain number and grain size in Bahatans-87 and grain size in Tincurrin. In the terminal drought treatment, Bahatans-87 had 59% lower water use efficiency than Tincurrin, as Bahatans-87 used 39% more water and reduced grain yield more than Tincurrin. The lesser reduction in grain yield in Tincurrin was associated with slower water extraction by the small root system and slower decline in stomatal conductance, leaf photosynthesis, and transpiration rates, but more importantly to faster phenological development, which enabled grain filling to be completed before the severe effects of water stress. |
| first_indexed | 2024-12-11T06:05:19Z |
| format | Article |
| id | doaj.art-98cb9d30c0b9489a89bb6a536724ca7a |
| institution | Directory Open Access Journal |
| issn | 1664-462X |
| language | English |
| last_indexed | 2024-12-11T06:05:19Z |
| publishDate | 2020-08-01 |
| publisher | Frontiers Media S.A. |
| record_format | Article |
| series | Frontiers in Plant Science |
| spelling | doaj.art-98cb9d30c0b9489a89bb6a536724ca7a2022-12-22T01:18:20ZengFrontiers Media S.A.Frontiers in Plant Science1664-462X2020-08-011110.3389/fpls.2020.01285556088Wheat Cultivars With Contrasting Root System Size Responded Differently to Terminal DroughtVictoria Figueroa-Bustos0Jairo A. Palta1Jairo A. Palta2Yinglong Chen3Katia Stefanova4Kadambot H. M. Siddique5The UWA Institute of Agriculture, and UWA School of Agriculture and Environment, The University of Western Australia, Perth, WA, AustraliaThe UWA Institute of Agriculture, and UWA School of Agriculture and Environment, The University of Western Australia, Perth, WA, AustraliaCSIRO Agriculture & Food, Wembley, WA, AustraliaThe UWA Institute of Agriculture, and UWA School of Agriculture and Environment, The University of Western Australia, Perth, WA, AustraliaThe UWA Institute of Agriculture, and UWA School of Agriculture and Environment, The University of Western Australia, Perth, WA, AustraliaThe UWA Institute of Agriculture, and UWA School of Agriculture and Environment, The University of Western Australia, Perth, WA, AustraliaIn the Mediterranean-type environment of Australia and other parts of the world, end-of- season or terminal drought is the most significant abiotic stress affecting wheat grain yields. This study examined the response of two wheat cultivars with contrasting root system size to terminal drought and the effect of terminal drought on grain yield and yield components. The cultivars were grown in 1.0 m deep PVC columns filled with soil in a glasshouse under well-watered conditions until the onset of ear emergence (Z51) when well-watered and terminal drought treatments were imposed. Terminal drought reduced stomatal conductance, leaf photosynthesis, and transpiration rates faster in Bahatans-87 (larger root system size) than Tincurrin (smaller root system size). Terminal drought reduced grain yield in both cultivars, more so in Bahatans-87 (80%) with the large root system than Tincurrin (67%) with the small root system, which was mainly due to a reduction in grain number and grain size in Bahatans-87 and grain size in Tincurrin. In the terminal drought treatment, Bahatans-87 had 59% lower water use efficiency than Tincurrin, as Bahatans-87 used 39% more water and reduced grain yield more than Tincurrin. The lesser reduction in grain yield in Tincurrin was associated with slower water extraction by the small root system and slower decline in stomatal conductance, leaf photosynthesis, and transpiration rates, but more importantly to faster phenological development, which enabled grain filling to be completed before the severe effects of water stress.https://www.frontiersin.org/article/10.3389/fpls.2020.01285/fullterminal droughtroot system sizewater use efficiencywater usewheat |
| spellingShingle | Victoria Figueroa-Bustos Jairo A. Palta Jairo A. Palta Yinglong Chen Katia Stefanova Kadambot H. M. Siddique Wheat Cultivars With Contrasting Root System Size Responded Differently to Terminal Drought Frontiers in Plant Science terminal drought root system size water use efficiency water use wheat |
| title | Wheat Cultivars With Contrasting Root System Size Responded Differently to Terminal Drought |
| title_full | Wheat Cultivars With Contrasting Root System Size Responded Differently to Terminal Drought |
| title_fullStr | Wheat Cultivars With Contrasting Root System Size Responded Differently to Terminal Drought |
| title_full_unstemmed | Wheat Cultivars With Contrasting Root System Size Responded Differently to Terminal Drought |
| title_short | Wheat Cultivars With Contrasting Root System Size Responded Differently to Terminal Drought |
| title_sort | wheat cultivars with contrasting root system size responded differently to terminal drought |
| topic | terminal drought root system size water use efficiency water use wheat |
| url | https://www.frontiersin.org/article/10.3389/fpls.2020.01285/full |
| work_keys_str_mv | AT victoriafigueroabustos wheatcultivarswithcontrastingrootsystemsizerespondeddifferentlytoterminaldrought AT jairoapalta wheatcultivarswithcontrastingrootsystemsizerespondeddifferentlytoterminaldrought AT jairoapalta wheatcultivarswithcontrastingrootsystemsizerespondeddifferentlytoterminaldrought AT yinglongchen wheatcultivarswithcontrastingrootsystemsizerespondeddifferentlytoterminaldrought AT katiastefanova wheatcultivarswithcontrastingrootsystemsizerespondeddifferentlytoterminaldrought AT kadambothmsiddique wheatcultivarswithcontrastingrootsystemsizerespondeddifferentlytoterminaldrought |