Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1093/treephys/tpy049 |
Variations in xylem embolism susceptibility under drought between intact saplings of three walnut species | |
Knipfer, Thorsten1; Barrios-Masias, Felipe H.1,4; Cuneo, Italo F.1,5; Bouda, Martin2; Albuquerque, Caetano P.1; Brodersen, Craig R.2; Kluepfel, Daniel A.3; McElrone, Andrew J.1,3 | |
通讯作者 | McElrone, Andrew J. |
来源期刊 | TREE PHYSIOLOGY
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ISSN | 0829-318X |
EISSN | 1758-4469 |
出版年 | 2018 |
卷号 | 38期号:8页码:1180-1192 |
英文摘要 | A germplasm collection containing varied Juglans genotypes holds potential to improve drought resistance of plant materials for commercial production. We used X-ray computed microtomography to evaluate stem xylem embolism susceptibility/ repair in relation to vessel anatomical features (size, arrangement, connectivity and pit characteristics) in 2-year-old saplings of three Juglans species. In vivo analysis revealed interspecific variations in embolism susceptibility among Juglans microcarpa, J. hindsii (both native to arid habitats) and J. ailantifolia (native to mesic habitats). Stem xylem of J. microcarpa was more resistant to droughtinduced embolism as compared with J. hindsii and J. ailantifolia (differences in embolism susceptibility among older and current year xylem were not detected in any species). Variations in most vessel anatomical traits were negligible among the three species; however, we detected substantial interspecific differences in intervessel pit characteristics. As compared with J. hindsii and J. ailantifolia, low embolism susceptibility in J. microcarpa was associated with smaller pit size in larger diameter vessels, a smaller area of the shared vessel wall occupied by pits, lower pit frequency and no changes in pit characteristics as vessel diameters increased. Changes in amount of embolized vessels following 40 days of re-watering were minor in intact saplings of all three species highlighting that an embolism repair mechanism did not contribute to drought recovery. In conclusion, our data indicate that interspecific variations in drought-induced embolism susceptibility are associated with species-specific pit characteristics, and these traits may provide a future target for breeding efforts aimed at selecting walnut germplasm with improved drought resistance. |
英文关键词 | microCT saplings water relations water stress X-ray xylem |
类型 | Article |
语种 | 英语 |
国家 | USA ; Chile |
收录类别 | SCI-E |
WOS记录号 | WOS:000443581000009 |
WOS关键词 | X-RAY MICROTOMOGRAPHY ; ROOT PRESSURE ; VULNERABILITY SEGMENTATION ; CAVITATION RESISTANCE ; STOMATAL CLOSURE ; WATER TRANSPORT ; JUGLANS-REGIA ; TREES ; RECOVERY ; TENSION |
WOS类目 | Forestry |
WOS研究方向 | Forestry |
来源机构 | University of California, Davis |
资源类型 | 期刊论文 |
条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/213500 |
作者单位 | 1.Univ Calif Davis, Dept Viticulture & Enol, Davis, CA 95616 USA; 2.Yale Univ, Sch Forestry & Environm Studies, New Haven, CT 06511 USA; 3.USDA ARS, Crops Pathol & Genet Res Unit, Davis, CA 95616 USA; 4.Univ Nevada, Dept Agr Nutr & Vet Sci, Reno, NV 89557 USA; 5.Pontificia Univ Catolica Valparaiso, Sch Agron, Quillota 2260000, Chile |
推荐引用方式 GB/T 7714 | Knipfer, Thorsten,Barrios-Masias, Felipe H.,Cuneo, Italo F.,et al. Variations in xylem embolism susceptibility under drought between intact saplings of three walnut species[J]. University of California, Davis,2018,38(8):1180-1192. |
APA | Knipfer, Thorsten.,Barrios-Masias, Felipe H..,Cuneo, Italo F..,Bouda, Martin.,Albuquerque, Caetano P..,...&McElrone, Andrew J..(2018).Variations in xylem embolism susceptibility under drought between intact saplings of three walnut species.TREE PHYSIOLOGY,38(8),1180-1192. |
MLA | Knipfer, Thorsten,et al."Variations in xylem embolism susceptibility under drought between intact saplings of three walnut species".TREE PHYSIOLOGY 38.8(2018):1180-1192. |
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