Terminal drought effect on sugar partitioning and metabolism is modulated by leaf stay-green and panicle size in the stem of sweet sorghum (Sorghum bicolor L. Moench)
Abstract Background The benefits of leaf stay-green for maintaining grain filling in sorghum under drought was largely demonstrated. However, its role in the stability of a dual production (grain, stem sugar) in tall sweet sorghum remains to be elucidated. This study aimed to analyze the impact of a...
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CABI
2020-06-01
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| Series: | CABI Agriculture and Bioscience |
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| Online Access: | https://doi.org/10.1186/s43170-020-00003-w |
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| author | Thierry Klanvi Tovignan Hubert Adoukonou-Sagbadja Cyril Diatta Anne Clément-Vidal Armelle Soutiras Ndiaga Cisse Delphine Luquet |
| author_facet | Thierry Klanvi Tovignan Hubert Adoukonou-Sagbadja Cyril Diatta Anne Clément-Vidal Armelle Soutiras Ndiaga Cisse Delphine Luquet |
| author_sort | Thierry Klanvi Tovignan |
| collection | DOAJ |
| description | Abstract Background The benefits of leaf stay-green for maintaining grain filling in sorghum under drought was largely demonstrated. However, its role in the stability of a dual production (grain, stem sugar) in tall sweet sorghum remains to be elucidated. This study aimed to analyze the impact of a post-anthesis drought on sugar accumulation along stem internodes in sweet and tall West-African sorghum with variable leaf stay-green and grain yield abilities. Methods Four accessions with similar phenology were studied in two consecutive years in the field at the National Agronomic Research Centre (CNRA) of Bambey (Senegal, West Africa) under two post-anthesis water treatments (irrigated, non-irrigated). Plant morphology, stem sugar related traits, grain production, and plant leaf area (PLA) variation were assessed. Carbohydrate contents (sucrose, hexoses, starch) were determined during grain filling in the whole stem juice and at three internode levels: bottom, median, top. Analysis of variance was performed to test post-anthesis water treatment, accession, organ, year effects and their interactions on the studied traits. Results Panicle dry weight (PDW) was not affected by drought, but strongly varied among years and accessions. The PDW/PLA ratio was negatively correlated with the variation of sucrose and hexoses at the three internodes levels. This carbohydrates reduction was mainly influenced by the PDW. The bigger the panicle the higher the carbohydrates remobilization from the stem to panicle for grain filling. This was mainly shown on accessions G3 and G11 which exhibited low stay green ability. However, G10 with low PDW/PLA ratio and showing higher stay green ability, exhibited a low reduction of total soluble sugars and sucrose and inversely higher increase of hexoses mainly at the median internode. Conclusions This ability to better maintain green leaf area and high hexoses in the stem under post-flowering drought could be an osmoregulation mechanism to adapt to drought. Therefore, stay-green is an important trait to consider for sweet sorghum breeding and particularly in the objective of developing dual purpose varieties in drought prone environments. |
| format | Article |
| id | doaj-art-61d5e9becea04e6aa704932e8ac1ce86 |
| institution | Kabale University |
| issn | 2662-4044 |
| language | English |
| publishDate | 2020-06-01 |
| publisher | CABI |
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| series | CABI Agriculture and Bioscience |
| spelling | doaj-art-61d5e9becea04e6aa704932e8ac1ce862025-02-02T20:18:26ZengCABICABI Agriculture and Bioscience2662-40442020-06-011111110.1186/s43170-020-00003-wTerminal drought effect on sugar partitioning and metabolism is modulated by leaf stay-green and panicle size in the stem of sweet sorghum (Sorghum bicolor L. Moench)Thierry Klanvi Tovignan0Hubert Adoukonou-Sagbadja1Cyril Diatta2Anne Clément-Vidal3Armelle Soutiras4Ndiaga Cisse5Delphine Luquet6Centre d’Etudes Régional pour l’Amélioration de l’Adaptation à la Sécheresse (CERAAS)Département de Génétique et Biotechnologie, Faculté des Sciences et Techniques (FAST), Université d’Abomey-Calavi (UAC)Centre d’Etudes Régional pour l’Amélioration de l’Adaptation à la Sécheresse (CERAAS)CIRAD, UMR AGAPCIRAD, UMR AGAPCentre d’Etudes Régional pour l’Amélioration de l’Adaptation à la Sécheresse (CERAAS)CIRAD, UMR AGAPAbstract Background The benefits of leaf stay-green for maintaining grain filling in sorghum under drought was largely demonstrated. However, its role in the stability of a dual production (grain, stem sugar) in tall sweet sorghum remains to be elucidated. This study aimed to analyze the impact of a post-anthesis drought on sugar accumulation along stem internodes in sweet and tall West-African sorghum with variable leaf stay-green and grain yield abilities. Methods Four accessions with similar phenology were studied in two consecutive years in the field at the National Agronomic Research Centre (CNRA) of Bambey (Senegal, West Africa) under two post-anthesis water treatments (irrigated, non-irrigated). Plant morphology, stem sugar related traits, grain production, and plant leaf area (PLA) variation were assessed. Carbohydrate contents (sucrose, hexoses, starch) were determined during grain filling in the whole stem juice and at three internode levels: bottom, median, top. Analysis of variance was performed to test post-anthesis water treatment, accession, organ, year effects and their interactions on the studied traits. Results Panicle dry weight (PDW) was not affected by drought, but strongly varied among years and accessions. The PDW/PLA ratio was negatively correlated with the variation of sucrose and hexoses at the three internodes levels. This carbohydrates reduction was mainly influenced by the PDW. The bigger the panicle the higher the carbohydrates remobilization from the stem to panicle for grain filling. This was mainly shown on accessions G3 and G11 which exhibited low stay green ability. However, G10 with low PDW/PLA ratio and showing higher stay green ability, exhibited a low reduction of total soluble sugars and sucrose and inversely higher increase of hexoses mainly at the median internode. Conclusions This ability to better maintain green leaf area and high hexoses in the stem under post-flowering drought could be an osmoregulation mechanism to adapt to drought. Therefore, stay-green is an important trait to consider for sweet sorghum breeding and particularly in the objective of developing dual purpose varieties in drought prone environments.https://doi.org/10.1186/s43170-020-00003-wSweet sorghumCarbohydrate partitioningInternodePost-anthesis drought |
| spellingShingle | Thierry Klanvi Tovignan Hubert Adoukonou-Sagbadja Cyril Diatta Anne Clément-Vidal Armelle Soutiras Ndiaga Cisse Delphine Luquet Terminal drought effect on sugar partitioning and metabolism is modulated by leaf stay-green and panicle size in the stem of sweet sorghum (Sorghum bicolor L. Moench) CABI Agriculture and Bioscience Sweet sorghum Carbohydrate partitioning Internode Post-anthesis drought |
| title | Terminal drought effect on sugar partitioning and metabolism is modulated by leaf stay-green and panicle size in the stem of sweet sorghum (Sorghum bicolor L. Moench) |
| title_full | Terminal drought effect on sugar partitioning and metabolism is modulated by leaf stay-green and panicle size in the stem of sweet sorghum (Sorghum bicolor L. Moench) |
| title_fullStr | Terminal drought effect on sugar partitioning and metabolism is modulated by leaf stay-green and panicle size in the stem of sweet sorghum (Sorghum bicolor L. Moench) |
| title_full_unstemmed | Terminal drought effect on sugar partitioning and metabolism is modulated by leaf stay-green and panicle size in the stem of sweet sorghum (Sorghum bicolor L. Moench) |
| title_short | Terminal drought effect on sugar partitioning and metabolism is modulated by leaf stay-green and panicle size in the stem of sweet sorghum (Sorghum bicolor L. Moench) |
| title_sort | terminal drought effect on sugar partitioning and metabolism is modulated by leaf stay green and panicle size in the stem of sweet sorghum sorghum bicolor l moench |
| topic | Sweet sorghum Carbohydrate partitioning Internode Post-anthesis drought |
| url | https://doi.org/10.1186/s43170-020-00003-w |
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