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| DOI | 10.1093/aob/mcae032 |
| Grape cultivars adapted to hotter, drier growing regions exhibit greater photosynthesis in hot conditions despite less drought-resistant leaves | |
| 发表日期 | 2024 |
| ISSN | 0305-7364 |
| EISSN | 1095-8290 |
| 英文摘要 | Background and Aims Many agricultural areas are expected to face hotter, drier conditions from climate change. Understanding the mechanisms that crops use to mitigate these stresses can guide breeding for more tolerant plant material. We tested relationships between traits, physiological function in hot conditions and historical climate associations to evaluate these mechanisms for winegrapes. We expected a more negative leaf osmotic potential at full hydration (pi o), which reduces leaf turgor loss during drought, and either a metabolically cheaper or more osmoprotectant leaf chemical composition, to allow cultivars associated with hot, dry regions to maintain greater gas exchange in hot growing conditions.Methods We measured pi o, gas exchange and leaf chemistry for seven commercially important winegrape cultivars that vary widely in historical climate associations. Vines were grown in common-garden field conditions in a hot wine-growing region (Davis, CA, USA) and measured over the hottest period of the growing season (July-September).Key Results The value of pi o varied significantly between cultivars, and all cultivars significantly reduced pi o (osmotically adjusted) over the study period, although osmotic adjustment did not vary across cultivars. The value of pi o was correlated with gas exchange and climate associations, but in the direction opposite to expected. Photosynthesis and pi o were higher in the cultivars associated with hotter, less humid regions. Leaf chemical composition varied between cultivars but was not related to climate associations.Conclusions These findings suggest that maintenance of leaf turgor is not a primary limitation on grapevine adaptation to hot or atmospherically dry growing conditions. Thus, selecting for a more negative pi o or greater osmotic adjustment is not a promising strategy to develop more climate-resilient grape varieties, contrary to findings for other crops. Future work is needed to identify the mechanisms increasing photosynthesis in the cultivars associated with hot, dry regions. |
| 英文关键词 | Grapevine; viticulture; osmotic adjustment; osmotic potential; drought tolerance; solute accumulation; inorganic ions; climate change |
| 语种 | 英语 |
| WOS研究方向 | Plant Sciences |
| WOS类目 | Plant Sciences |
| WOS记录号 | WOS:001193903500001 |
| 来源期刊 | ANNALS OF BOTANY
 |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/287495 |
| 作者单位 | University of California System; University of California Davis; United States Department of Agriculture (USDA); United States Department of Agriculture (USDA) |
| 推荐引用方式 GB/T 7714 | . Grape cultivars adapted to hotter, drier growing regions exhibit greater photosynthesis in hot conditions despite less drought-resistant leaves[J],2024. |
| APA | (2024).Grape cultivars adapted to hotter, drier growing regions exhibit greater photosynthesis in hot conditions despite less drought-resistant leaves.ANNALS OF BOTANY. |
| MLA | "Grape cultivars adapted to hotter, drier growing regions exhibit greater photosynthesis in hot conditions despite less drought-resistant leaves".ANNALS OF BOTANY (2024). |
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