Determining the effect of age and drought stress on the hydraulic conductance and vulnerability to cavitation of Douglas-fir seedling root systems using the vacuum method
Determining the effect of age and drought stress on the hydraulic conductance and vulnerability to cavitation of Douglas-fir seedling root systems using the vacuum method
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使用真空法确定年龄和干旱胁迫对花旗松幼苗根系水力导度和空化脆弱性的影响
DOI：
10.1007/s11056-022-09945-7
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发表时间：
2022
期刊：
影响因子：
2.2
通讯作者：
Wightman, Maxwell G.
中科院分区：
文献类型：
--
作者：
Gonzalez-Benecke, Carlos A.;Alzugaray-Oswald, Patricio J.;Wightman, Maxwell G.
植物输送水的能力（以导水率测量）的降低会影响气孔导度和光合气体交换。根是对空化抵抗力最差的植物器官，因此，根导水率和对空化的脆弱性已被提议作为幼苗质量评估的附加因素。然而，对于重要的针叶树物种来说，这一性状的表征很差，阻碍了将这一重要的生理性状整合到遗传选择和苗圃生产的标准中。在本研究的第一部分中，我们修改了真空室方法的原始设计，允许测量幼针叶树幼苗的整个根系。然后将该方法与四种树种茎的标准重力测量进行比较，我们的结果证实真空室是测量水力传导的可靠技术。我们能够利用两个人的团队每天对整个根系的水力导度进行多达 50 次测量，从而为大规模根部水力评估（包括基因筛选）提供了可能性。在研究的第二部分中，采用真空室方法评估了苗圃灌溉制度和苗龄对沿海花旗松茎和整个根系导水率的影响。当沿海花旗松幼苗在有限的可用水量下生长时，根和茎的木质部水导率均下降 65%。与此相反，当花旗松幼苗在浇水良好的条件下生长时，根部比茎部的水分运输效率降低更多。
Reductions in a plant’s ability to transport water, measured as hydraulic conductivity, can impact stomatal conductance and photosynthetic gas exchange. Roots are the plant organs least resistant to cavitation and, due to this, root hydraulic conductivity and vulnerability to cavitation have been proposed as an additional element for seedling quality evaluations. This trait, however, has been poorly characterized for important conifer species preventing the integration of this important physiological trait into criteria for genetic selection and nursery production. In the first part of this study, we modified the original design of the vacuum chamber method allowing for measurements of the whole root system of young conifer seedlings. This method was then compared with standard gravimetric measurements for stems of four tree species and our results confirmed that the vacuum chamber is a reliable technique to measure hydraulic conductance. We were able to perform up to 50 measurements per day of hydraulic conductance of whole root systems using a team of two people, opening the possibility for large scale assessments of root hydraulics, including genetic screening. In the second part of the study, the vacuum chamber method was used to assess the impact of nursery irrigation regime and seedling age on coastal Douglas-fir stem and whole root system hydraulic conductance. When coastal Douglas-fir seedlings grew under limited water availability, roots and stems both experienced a 65% reduction in xylem hydraulic conductance. In contrast to this, Douglas-fir seedling water transport efficiency was reduced more in roots than stems when seedlings were grown under well-watered conditions.
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幼苗建立及对土壤水分时空变化的生理反应
影响因子：
2.2
作者：
J. R. Pinto;John D. Marshall;R. K. Dumroese;Anthony S Davis;Douglas R. Cobos
通讯作者：
Douglas R. Cobos
DOI：
--
发表时间：
2005
期刊：
影响因子：
--
作者：
G. North;C. Peterson
通讯作者：
C. Peterson
植被管理和立地条件对美国西北太平洋地区四种针叶树种体积、生物量和叶面积异速生长的影响
影响因子：
2.9
作者：
C. Gonzalez;Herman N. Flamenco;M. Wightman
通讯作者：
M. Wightman
花旗松幼苗芽和根系组织-水分关系的季节变化
DOI：
--
发表时间：
1984
期刊：
影响因子：
--
作者：
G. Ritchie;R. G. Shula
通讯作者：
R. G. Shula
影响因子：
5.6
作者：
Sloan, Joshua L.;Burney, Owen T.;Pinto, Jeremiah R.
通讯作者：
Pinto, Jeremiah R.