Grain-Filling Rate Improves Physical Grain Quality in Barley Under Heat Stress Conditions During the Grain-Filling Period
Heat stress is a primary constraint to Australia's barley production. In addition to impacting grain yield, it adversely affects physical grain quality (weight and plumpness) and market value. The incidence of heat stress during grain filling is rising with global warming. However, breeding for...
| Main Authors: | , , , , , , , |
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| Format: | Article |
| Language: | English |
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Frontiers Media S.A.
2022-05-01
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| Series: | Frontiers in Plant Science |
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| Online Access: | https://www.frontiersin.org/articles/10.3389/fpls.2022.858652/full |
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| author | Hamid Shirdelmoghanloo Kefei Chen Blakely H. Paynter Tefera Tolera Angessa Tefera Tolera Angessa Sharon Westcott Sharon Westcott Hammad Aziz Khan Hammad Aziz Khan Camilla Beate Hill Chengdao Li Chengdao Li |
| author_facet | Hamid Shirdelmoghanloo Kefei Chen Blakely H. Paynter Tefera Tolera Angessa Tefera Tolera Angessa Sharon Westcott Sharon Westcott Hammad Aziz Khan Hammad Aziz Khan Camilla Beate Hill Chengdao Li Chengdao Li |
| author_sort | Hamid Shirdelmoghanloo |
| collection | DOAJ |
| description | Heat stress is a primary constraint to Australia's barley production. In addition to impacting grain yield, it adversely affects physical grain quality (weight and plumpness) and market value. The incidence of heat stress during grain filling is rising with global warming. However, breeding for new superior heat-tolerant genotypes has been challenging due to the narrow window of sensitivity, the unpredictable nature of heat stress, and its frequent co-occurrence with drought stress. Greater scientific knowledge regarding traits and mechanisms associated with heat tolerance would help develop more efficient selection methods. Our objective was to assess 157 barley varieties of contrasting genetic backgrounds for various developmental, agro-morphological, and physiological traits to examine the effects of heat stress on physical grain quality. Delayed sowing (i.e., July and August) increased the likelihood of daytime temperatures above 30°C during grain-filling. Supplementary irrigation of field trials ensured a reduced impact of drought stress. Heat tolerance appeared to be the primary factor determining grain plumpness. A wide variation was observed for heat tolerance, particularly among the Australian varieties. Genotypic variation was also observed for grain weight, plumpness, grain growth components, stay-green and stem water-soluble carbohydrates (WSC) content, and mobilisation under normal and delayed sown conditions. Compared to normal sowing, delayed sowing reduced duration of developmental phases, plant height, leaf size, head length, head weight, grain number, plumpness, grain width and thickness, stem WSC content, green leaf area retention, and harvest index (HI), and increased screenings, grain length, grain-filling rate (GFR), WSC mobilisation efficiency (WSCME), and grain protein content. Overall, genotypes with heavier and plumper grains under high temperatures had higher GFR, longer grain-filling duration, longer green leaf area retention, higher WSCME, taller stature, smaller leaf size, greater HI, higher grain weight/plumpness potentials, and earlier flowering. GFR played a significant role in determining barley grain weight and plumpness under heat-stress conditions. Enhancing GFR may provide a new avenue for improving heat tolerance in barley. |
| first_indexed | 2024-12-12T03:31:56Z |
| format | Article |
| id | doaj.art-0cb0d5651b2a47ed8cbaeac463ccde83 |
| institution | Directory Open Access Journal |
| issn | 1664-462X |
| language | English |
| last_indexed | 2024-12-12T03:31:56Z |
| publishDate | 2022-05-01 |
| publisher | Frontiers Media S.A. |
| record_format | Article |
| series | Frontiers in Plant Science |
| spelling | doaj.art-0cb0d5651b2a47ed8cbaeac463ccde832022-12-22T00:39:54ZengFrontiers Media S.A.Frontiers in Plant Science1664-462X2022-05-011310.3389/fpls.2022.858652858652Grain-Filling Rate Improves Physical Grain Quality in Barley Under Heat Stress Conditions During the Grain-Filling PeriodHamid Shirdelmoghanloo0Kefei Chen1Blakely H. Paynter2Tefera Tolera Angessa3Tefera Tolera Angessa4Sharon Westcott5Sharon Westcott6Hammad Aziz Khan7Hammad Aziz Khan8Camilla Beate Hill9Chengdao Li10Chengdao Li11Department of Primary Industries and Regional Development, Northam, WA, AustraliaSchool of Molecular and Life Sciences, Curtin University, Perth, WA, AustraliaDepartment of Primary Industries and Regional Development, Northam, WA, AustraliaDepartment of Primary Industries and Regional Development, Perth, WA, AustraliaWestern Crop Genetics Alliance, College of Science, Health, Engineering and Education, Murdoch University, Perth, WA, AustraliaDepartment of Primary Industries and Regional Development, Perth, WA, AustraliaWestern Crop Genetics Alliance, College of Science, Health, Engineering and Education, Murdoch University, Perth, WA, AustraliaDepartment of Primary Industries and Regional Development, Northam, WA, AustraliaWestern Crop Genetics Alliance, College of Science, Health, Engineering and Education, Murdoch University, Perth, WA, AustraliaWestern Crop Genetics Alliance, College of Science, Health, Engineering and Education, Murdoch University, Perth, WA, AustraliaDepartment of Primary Industries and Regional Development, Perth, WA, AustraliaWestern Crop Genetics Alliance, College of Science, Health, Engineering and Education, Murdoch University, Perth, WA, AustraliaHeat stress is a primary constraint to Australia's barley production. In addition to impacting grain yield, it adversely affects physical grain quality (weight and plumpness) and market value. The incidence of heat stress during grain filling is rising with global warming. However, breeding for new superior heat-tolerant genotypes has been challenging due to the narrow window of sensitivity, the unpredictable nature of heat stress, and its frequent co-occurrence with drought stress. Greater scientific knowledge regarding traits and mechanisms associated with heat tolerance would help develop more efficient selection methods. Our objective was to assess 157 barley varieties of contrasting genetic backgrounds for various developmental, agro-morphological, and physiological traits to examine the effects of heat stress on physical grain quality. Delayed sowing (i.e., July and August) increased the likelihood of daytime temperatures above 30°C during grain-filling. Supplementary irrigation of field trials ensured a reduced impact of drought stress. Heat tolerance appeared to be the primary factor determining grain plumpness. A wide variation was observed for heat tolerance, particularly among the Australian varieties. Genotypic variation was also observed for grain weight, plumpness, grain growth components, stay-green and stem water-soluble carbohydrates (WSC) content, and mobilisation under normal and delayed sown conditions. Compared to normal sowing, delayed sowing reduced duration of developmental phases, plant height, leaf size, head length, head weight, grain number, plumpness, grain width and thickness, stem WSC content, green leaf area retention, and harvest index (HI), and increased screenings, grain length, grain-filling rate (GFR), WSC mobilisation efficiency (WSCME), and grain protein content. Overall, genotypes with heavier and plumper grains under high temperatures had higher GFR, longer grain-filling duration, longer green leaf area retention, higher WSCME, taller stature, smaller leaf size, greater HI, higher grain weight/plumpness potentials, and earlier flowering. GFR played a significant role in determining barley grain weight and plumpness under heat-stress conditions. Enhancing GFR may provide a new avenue for improving heat tolerance in barley.https://www.frontiersin.org/articles/10.3389/fpls.2022.858652/fullgrain weightplumpnessheat stressgrain-fillingstay-greenwater-soluble carbohydrates |
| spellingShingle | Hamid Shirdelmoghanloo Kefei Chen Blakely H. Paynter Tefera Tolera Angessa Tefera Tolera Angessa Sharon Westcott Sharon Westcott Hammad Aziz Khan Hammad Aziz Khan Camilla Beate Hill Chengdao Li Chengdao Li Grain-Filling Rate Improves Physical Grain Quality in Barley Under Heat Stress Conditions During the Grain-Filling Period Frontiers in Plant Science grain weight plumpness heat stress grain-filling stay-green water-soluble carbohydrates |
| title | Grain-Filling Rate Improves Physical Grain Quality in Barley Under Heat Stress Conditions During the Grain-Filling Period |
| title_full | Grain-Filling Rate Improves Physical Grain Quality in Barley Under Heat Stress Conditions During the Grain-Filling Period |
| title_fullStr | Grain-Filling Rate Improves Physical Grain Quality in Barley Under Heat Stress Conditions During the Grain-Filling Period |
| title_full_unstemmed | Grain-Filling Rate Improves Physical Grain Quality in Barley Under Heat Stress Conditions During the Grain-Filling Period |
| title_short | Grain-Filling Rate Improves Physical Grain Quality in Barley Under Heat Stress Conditions During the Grain-Filling Period |
| title_sort | grain filling rate improves physical grain quality in barley under heat stress conditions during the grain filling period |
| topic | grain weight plumpness heat stress grain-filling stay-green water-soluble carbohydrates |
| url | https://www.frontiersin.org/articles/10.3389/fpls.2022.858652/full |
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