Arid
DOI10.1093/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
ISSN0829-318X
EISSN1758-4469
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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