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ניגודיות עדינהניגודיות גבוההמונוכרוםהדגשת קישוריםחסימת אנימציהפונט קריאסגוראיפוס הגדרות נגישותלהורדת מודול נגישות חינםManage

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Air method measurements of apple vessel length distributions with improved apparatus and theory

Year:

2003

Source of publication :

Journal of Experimental BotanyAuthors :

Cohen, Shabtai

;

.

Volume :

54

Co-Authors:

Cohen, S., Dept. of Environ. Phys./Irrigation, Inst. of Soil, Water/Environ. Sci., ARO Volcani Center, POB 6, Bet Dagan 50250, Israel

Bennink, J., Northeastern Research Station, USDA Forest Service, 705 Spear St., S. Burlington, VT 05403, United States

Tyree, M., Northeastern Research Station, USDA Forest Service, 705 Spear St., S. Burlington, VT 05403, United States

Bennink, J., Northeastern Research Station, USDA Forest Service, 705 Spear St., S. Burlington, VT 05403, United States

Tyree, M., Northeastern Research Station, USDA Forest Service, 705 Spear St., S. Burlington, VT 05403, United States

Facilitators :

From page:

1889

To page:

1897

(

Total pages:

9

)

Link :

Air method measurements of apple vessel length distributions with improved apparatus and theoryAbstract:

Studies showing that rootstock dwarfing potential is related to plant hydraulic conductance led to the hypothesis that xylem properties are also related. Vessel length distribution and other properties of apple wood from a series of varieties were measured using the 'air method' in order to test this hypothesis. Apparatus was built to measure and monitor conductivity to air of fresh wood segments of different lengths. Theory for determining vessel length distribution was improved to give a single parameter uni-modal vessel length probability density function. The function, derived by combining the exponential extinction (with extinction coefficient k) of wood conductivity to air (C) as wood length (x) increases (i.e. C=Co exp (-kx)) with the differential double difference formula, is Px=xXk2 exp (-kx), where Px is the fraction of vessels of length x. The main parameter of the distribution, k, was found to be the inverse of the mode of the distribution, i.e. the most common vessel length, L o. Lo for ten apple rootstock and scion varieties varied from 5.6±0.1 cm (±SE) for MM.111 to 9.0±1.0 for Prunifolia (P <0.05). Average maximum vessel length was approximately 50 cm, and differences were not significant. Effective vessel radii ranged from 14 for Prunifolia to 24.3±0.7 μm for M.26, with standard errors less than 12% of the mean. Specific conductivity of a 15 cm wood segment ranged from 2×10-4 to 1.6±0.2×10-2 dm3 s-1 kPa-1 m-1 for maruba and M.26, respectively, with standard errors up to 63% of the mean. Vessel density at the air entry point ranged from 18±3 to 42±6 vessels mm-2 for M.26 and MM.106, respectively, with standard errors as high as 89% of the mean. It was concluded that there is no general relationship between the wood properties investigated and rootstock size class, and that plasticity increases from vessel lengths to radii to specific conductivity and vessel densities.

Note:

Related Files :

Apple

electric conductivity

Fruits

Histology

metabolism

Models, Biological

Scion

transport at the cellular level

water

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Related Content

More details

DOI :

10.1093/jxb/erg202

Article number:

Affiliations:

Database:

Scopus

Publication Type:

article

;

.

Language:

English

Editors' remarks:

ID:

27077

Last updated date:

02/03/2022 17:27

Creation date:

17/04/2018 00:28

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Scientific Publication

Air method measurements of apple vessel length distributions with improved apparatus and theory

54

Cohen, S., Dept. of Environ. Phys./Irrigation, Inst. of Soil, Water/Environ. Sci., ARO Volcani Center, POB 6, Bet Dagan 50250, Israel

Bennink, J., Northeastern Research Station, USDA Forest Service, 705 Spear St., S. Burlington, VT 05403, United States

Tyree, M., Northeastern Research Station, USDA Forest Service, 705 Spear St., S. Burlington, VT 05403, United States

Bennink, J., Northeastern Research Station, USDA Forest Service, 705 Spear St., S. Burlington, VT 05403, United States

Tyree, M., Northeastern Research Station, USDA Forest Service, 705 Spear St., S. Burlington, VT 05403, United States

Air method measurements of apple vessel length distributions with improved apparatus and theory

Studies showing that rootstock dwarfing potential is related to plant hydraulic conductance led to the hypothesis that xylem properties are also related. Vessel length distribution and other properties of apple wood from a series of varieties were measured using the 'air method' in order to test this hypothesis. Apparatus was built to measure and monitor conductivity to air of fresh wood segments of different lengths. Theory for determining vessel length distribution was improved to give a single parameter uni-modal vessel length probability density function. The function, derived by combining the exponential extinction (with extinction coefficient k) of wood conductivity to air (C) as wood length (x) increases (i.e. C=Co exp (-kx)) with the differential double difference formula, is Px=xXk2 exp (-kx), where Px is the fraction of vessels of length x. The main parameter of the distribution, k, was found to be the inverse of the mode of the distribution, i.e. the most common vessel length, L o. Lo for ten apple rootstock and scion varieties varied from 5.6±0.1 cm (±SE) for MM.111 to 9.0±1.0 for Prunifolia (P <0.05). Average maximum vessel length was approximately 50 cm, and differences were not significant. Effective vessel radii ranged from 14 for Prunifolia to 24.3±0.7 μm for M.26, with standard errors less than 12% of the mean. Specific conductivity of a 15 cm wood segment ranged from 2×10-4 to 1.6±0.2×10-2 dm3 s-1 kPa-1 m-1 for maruba and M.26, respectively, with standard errors up to 63% of the mean. Vessel density at the air entry point ranged from 18±3 to 42±6 vessels mm-2 for M.26 and MM.106, respectively, with standard errors as high as 89% of the mean. It was concluded that there is no general relationship between the wood properties investigated and rootstock size class, and that plasticity increases from vessel lengths to radii to specific conductivity and vessel densities.

Scientific Publication

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