e-journal

Non-destructive estimation of root pressure using sap flow, stem diameter measurements and mechanistic modelling

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† Background:
Upward water movement in plants via the xylem is generally attributed to the cohesion–tension theory, as a response to transpiration. Under certain environmental conditions, root pressure can also contribute
to upward xylem water flow. Although the occurrence of root pressure is widely recognized, ambiguity exists
about the exact mechanism behind root pressure, the main influencing factors and the consequences of root pressure. In horticultural crops, such as tomato (Solanum lycopersicum), root pressure is thought to cause cells to burst, and to have an important impact on the marketable yield. Despite the challenges of root pressure research, progress in this area is limited, probably because of difficulties with direct measurement of root pressure, prompting the need for indirect and non-destructive measurement techniques.

† Methods:
A new approach to allow non-destructive and non-invasive estimation of root pressure is presented, using continuous measurements of sap flow and stem diameter variation in tomato combined with a mechanistic
flow and storage model, based on cohesion–tension principles.

† Key Results:
Transpiration-driven sap flow rates are typically inversely related to stem diameter changes; however, this inverse relationship was no longer valid under conditions of low transpiration. This decoupling between sap flow rates and stem diameter variations was mathematically related to root pressure.

†Conclusions:
Root pressure can be estimated in a non-destructive, repeatable manner, using only external plant sensors and a mechanistic model.

Key words: Root pressure, stem diameter, diameter change, tomato, sap flow, Solanum lycopersicum, mechanistic model, cohesion–tension, water relations.

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Informasi Detail

Judul Seri

Annals of Botany

No. Panggil

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Penerbit

Oxford : Oxford University Press on behalf of the Annals of Botany Company., 2013

Deskripsi Fisik

Annals of Botany 111: 271–282, 2013

Bahasa

English

ISBN/ISSN

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Klasifikasi

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Tipe Isi

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Tipe Media

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Tipe Pembawa

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Edisi

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Subjek

FISIOLOGI TANAMAN

Info Detail Spesifik

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Pernyataan Tanggungjawab

agus

Versi lain/terkait

Lampiran Berkas

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