Carbon assimilation and distribution in cotton photosynthetic organs is a limiting factor affecting boll weight formation under drought
Previous studies have documented cotton boll weight reductions under drought, but the relative importance of the subtending leaf, bracts and capsule wall in driving drought-induced reductions in boll mass has received limited attention. To investigate the role of carbon metabolism in driving organ-s...
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Frontiers Media S.A.
2022-09-01
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| Series: | Frontiers in Plant Science |
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| Online Access: | https://www.frontiersin.org/articles/10.3389/fpls.2022.1001940/full |
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| author | Jie Zou Wei Hu Dimitra A. Loka John L. Snider Honghai Zhu Yuxia Li Jiaqi He Youhua Wang Zhiguo Zhou |
| author_facet | Jie Zou Wei Hu Dimitra A. Loka John L. Snider Honghai Zhu Yuxia Li Jiaqi He Youhua Wang Zhiguo Zhou |
| author_sort | Jie Zou |
| collection | DOAJ |
| description | Previous studies have documented cotton boll weight reductions under drought, but the relative importance of the subtending leaf, bracts and capsule wall in driving drought-induced reductions in boll mass has received limited attention. To investigate the role of carbon metabolism in driving organ-specific differences in contribution to boll weight formation, under drought conditions. Controlled experiments were carried out under soil relative water content (SRWC) (75 ± 5)% (well-watered conditions, control), (60 ± 5)% (moderate drought) and (45 ± 5)% (severe drought) in 2018 and 2019 with two cultivars Yuzaomian 9110 and Dexiamian 1. Under severe drought, the decreases of photosynthetic rate (Pn) and carbon isotope composition (δ13C) were observed in the subtending leaf, bract and capsule wall, suggesting that carbon assimilation of three organs was restricted and the limitation was most pronounced in the subtending leaf. Changes in the activities of sucrose phosphate synthase (SPS), sucrose synthase (SuSy), invertases as well as the reduction in expression of sucrose transporter (GhSUT1) led to variabilities in the sucrose content of three organs. Moreover, photosynthate distribution from subtending leaf to seeds plus fibers (the components of boll weight) was significantly restricted and the photosynthetic contribution rate of subtending leaf to boll weight was decreased, while contributions of bracts and capsule wall were increased by drought. This, in conjunction with the observed decreases in boll weight, indicated that the subtending leaf was the most sensitive photosynthetic organ to drought and was a dominant driver of boll weight loss under drought. Therefore, the subtending leaf governs boll weight loss under drought due to limitations in carbon assimilation, perturbations in sucrose metabolism and inhibition of sucrose transport. |
| first_indexed | 2024-04-11T09:50:30Z |
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| issn | 1664-462X |
| language | English |
| last_indexed | 2024-04-11T09:50:30Z |
| publishDate | 2022-09-01 |
| publisher | Frontiers Media S.A. |
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| series | Frontiers in Plant Science |
| spelling | doaj.art-331039bd98074ec082ab94c563d774a52022-12-22T04:30:49ZengFrontiers Media S.A.Frontiers in Plant Science1664-462X2022-09-011310.3389/fpls.2022.10019401001940Carbon assimilation and distribution in cotton photosynthetic organs is a limiting factor affecting boll weight formation under droughtJie Zou0Wei Hu1Dimitra A. Loka2John L. Snider3Honghai Zhu4Yuxia Li5Jiaqi He6Youhua Wang7Zhiguo Zhou8Key Laboratory of Crop Growth Regulation, Ministry of Agriculture, Nanjing Agricultural University, Nanjing, ChinaKey Laboratory of Crop Growth Regulation, Ministry of Agriculture, Nanjing Agricultural University, Nanjing, ChinaInstitute of Industrial and Forage Crops, Hellenic Agricultural Organization, Larissa, GreeceDepartment of Crop and Soil Sciences, University of Georgia, Tifton, GA, United StatesKey Laboratory of Crop Growth Regulation, Ministry of Agriculture, Nanjing Agricultural University, Nanjing, ChinaKey Laboratory of Crop Growth Regulation, Ministry of Agriculture, Nanjing Agricultural University, Nanjing, ChinaKey Laboratory of Crop Growth Regulation, Ministry of Agriculture, Nanjing Agricultural University, Nanjing, ChinaKey Laboratory of Crop Growth Regulation, Ministry of Agriculture, Nanjing Agricultural University, Nanjing, ChinaKey Laboratory of Crop Growth Regulation, Ministry of Agriculture, Nanjing Agricultural University, Nanjing, ChinaPrevious studies have documented cotton boll weight reductions under drought, but the relative importance of the subtending leaf, bracts and capsule wall in driving drought-induced reductions in boll mass has received limited attention. To investigate the role of carbon metabolism in driving organ-specific differences in contribution to boll weight formation, under drought conditions. Controlled experiments were carried out under soil relative water content (SRWC) (75 ± 5)% (well-watered conditions, control), (60 ± 5)% (moderate drought) and (45 ± 5)% (severe drought) in 2018 and 2019 with two cultivars Yuzaomian 9110 and Dexiamian 1. Under severe drought, the decreases of photosynthetic rate (Pn) and carbon isotope composition (δ13C) were observed in the subtending leaf, bract and capsule wall, suggesting that carbon assimilation of three organs was restricted and the limitation was most pronounced in the subtending leaf. Changes in the activities of sucrose phosphate synthase (SPS), sucrose synthase (SuSy), invertases as well as the reduction in expression of sucrose transporter (GhSUT1) led to variabilities in the sucrose content of three organs. Moreover, photosynthate distribution from subtending leaf to seeds plus fibers (the components of boll weight) was significantly restricted and the photosynthetic contribution rate of subtending leaf to boll weight was decreased, while contributions of bracts and capsule wall were increased by drought. This, in conjunction with the observed decreases in boll weight, indicated that the subtending leaf was the most sensitive photosynthetic organ to drought and was a dominant driver of boll weight loss under drought. Therefore, the subtending leaf governs boll weight loss under drought due to limitations in carbon assimilation, perturbations in sucrose metabolism and inhibition of sucrose transport.https://www.frontiersin.org/articles/10.3389/fpls.2022.1001940/fullcottondroughtphotosynthetic organcarbon assimilationdistributionboll weight |
| spellingShingle | Jie Zou Wei Hu Dimitra A. Loka John L. Snider Honghai Zhu Yuxia Li Jiaqi He Youhua Wang Zhiguo Zhou Carbon assimilation and distribution in cotton photosynthetic organs is a limiting factor affecting boll weight formation under drought Frontiers in Plant Science cotton drought photosynthetic organ carbon assimilation distribution boll weight |
| title | Carbon assimilation and distribution in cotton photosynthetic organs is a limiting factor affecting boll weight formation under drought |
| title_full | Carbon assimilation and distribution in cotton photosynthetic organs is a limiting factor affecting boll weight formation under drought |
| title_fullStr | Carbon assimilation and distribution in cotton photosynthetic organs is a limiting factor affecting boll weight formation under drought |
| title_full_unstemmed | Carbon assimilation and distribution in cotton photosynthetic organs is a limiting factor affecting boll weight formation under drought |
| title_short | Carbon assimilation and distribution in cotton photosynthetic organs is a limiting factor affecting boll weight formation under drought |
| title_sort | carbon assimilation and distribution in cotton photosynthetic organs is a limiting factor affecting boll weight formation under drought |
| topic | cotton drought photosynthetic organ carbon assimilation distribution boll weight |
| url | https://www.frontiersin.org/articles/10.3389/fpls.2022.1001940/full |
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