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| DOI | 10.3390/horticulturae10040392 |
| Xylem Hydraulic Conductance Role in Kiwifruit Decline Syndrome Occurrence | |
| 发表日期 | 2024 |
| EISSN | 2311-7524 |
| 起始页码 | 10 |
| 结束页码 | 4 |
| 卷号 | 10期号:4 |
| 英文摘要 | Kiwifruit decline syndrome (KiDS) has affected kiwifruit orchards for more than ten years in the Mediterranean area, severely compromising productivity and causing extensive uprooting. The affected plants go through an irreversible and fast wilting process. The problem has not been solved yet, and a single cause has not been identified. In this work, we carried out a survey on ten five-year-old healthy kiwifruit cv. Hayward plants cultivated in an area strongly affected by KiDS and characterised by a rising temperature and vapor pressure deficit (VPD). Five plants were located in a KiDS-affected orchard. Our goal was to assess the hydraulic conductance of asymptomatic plants in a KiDS-affected area where rising climate change stress is underway. Our hypothesis was that a rising temperature and VPD could impair xylem functionality, leading the plants to develop strategies of tolerance, such as vessel narrowing, or stress symptoms, such as cavitation or implosion, inducing a higher risk of KiDS onset. Hydraulic conductance was investigated using a physiological and morphological approach to detect trunk sap flow, trunk growth and daily diameter variations, leaf gas exchanges and temperature, stem water potential, and the root xylem vessel diameter and vulnerability to cavitation. A strong xylem vessel narrowing was observed in all plants, with the highest frequency in the 30-45 mu m diameter class, which is an indicator of long-term adaptation to a rising VPD. In some plants, cavitation and implosion were also observed, which are indicative of a short-term stress response; this behaviour was detected in the plants in the KiDS-affected orchard, where a high leaf temperature (>39 degrees C), low stomatal conductance (<0.20 mol H2O m(-2) s(-1)) and transpiration (<3 mmol H2O m(-2) s(-1)), low stem water potential (<-1 MPa), high vulnerability to cavitation (3.7 mu m mm(-2)), low trunk sap flow and high daily stem diameter variation confirmed the water stress status. The concurrence of climate stress and agronomic management in predisposing conditions favourable to KiDS onset are discussed, evidencing the role of soil preparation, propagation material and previous crop. |
| 英文关键词 | kiwifruit decline syndrome; physiological disorder; hydraulic conductance; xylem vessels; cavitation; drought stress; climate change; agronomic management |
| 语种 | 英语 |
| WOS研究方向 | Agriculture |
| WOS类目 | Horticulture |
| WOS记录号 | WOS:001211259700001 |
| 来源期刊 | HORTICULTURAE
 |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/291517 |
| 作者单位 | Consiglio per la Ricerca in Agricoltura e L'analisi Dell'economia Agraria (CREA) |
| 推荐引用方式 GB/T 7714 | . Xylem Hydraulic Conductance Role in Kiwifruit Decline Syndrome Occurrence[J],2024,10(4). |
| APA | (2024).Xylem Hydraulic Conductance Role in Kiwifruit Decline Syndrome Occurrence.HORTICULTURAE,10(4). |
| MLA | "Xylem Hydraulic Conductance Role in Kiwifruit Decline Syndrome Occurrence".HORTICULTURAE 10.4(2024). |
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