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cultivated under irrigated or water deficit conditions. Elsevier, London, pp 251–281ĭe Oliveira PS, Pereira LS, Silva DC, de Souza Junior JO, Laviola BG, Gomes FP (2018) Hydraulic conductivity in stem of young plants of Jatropha curcas L. In: Sadras VO, Calderini DF (eds) Crop physiology applications for genetic improvement and agronomy. īrodribb TJ, Holloway-Phillips M, Bramley H (2015) Improving water transport for carbon gain in crops. Ann for Sci 59:389–396īrodribb TJ, Cochard H, Rodriguez Dominguez C (2019) Measuring the pulse of trees using the vascular system to predict tree mortality in the twenty-first century. New Phytol 226:1535–1538īogeat-Triboulot MB, Martin R, Chatelet D, Cochard H (2002) Hydraulic conductance of root and shoot measured with the transient and dynamic modes of the high-pressure flowmeter. J Exp Bot 62:99–109Īnderegg WRL, Venturas MD (2020) Plant hydraulics play a critical role in Earth system fluxes. 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.Īlsina MM, Smart DR, Bauerle T, de Herralde F, Biel C, Stockert C, Negron C, Save R (2011) Seasonal changes of whole root system conductance by a drought-tolerant grape root system. When coastal Douglas-fir seedlings grew under limited water availability, roots and stems both experienced a 65% reduction in xylem hydraulic conductance. 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. 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. 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. 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 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. 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.
Reductions in a plant’s ability to transport water, measured as hydraulic conductivity, can impact stomatal conductance and photosynthetic gas exchange.
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