ERA

Download the full-sized PDF of Role of adventitious roots in water relations of tamarack (Larix laricina) seedlings exposed to floodingDownload the full-sized PDF

Analytics

Share

Permanent link (DOI): https://doi.org/10.7939/R3V97ZR19

Download

Export to: EndNote  |  Zotero  |  Mendeley

Communities

This file is in the following communities:

Renewable Resources, Department of

Collections

This file is in the following collections:

Journal Articles (Renewable Resources)

Role of adventitious roots in water relations of tamarack (Larix laricina) seedlings exposed to flooding Open Access

Descriptions

Author or creator
Calvo-Polanco, M.
Senorans, J.
Zwiazek, J.J.
Additional contributors
Subject/Keyword
Deficit stress
Tolerance
Transport
Growth
Tomato plants
Aspen populus-tremuloides
Spruce picea-mariana
Cuttings
Leaf gas-exchange
Flow
Type of item
Journal Article (Published)
Language
English
Place
Time
Description
Background: Flooding reduces supply of oxygen to the roots affecting plant water uptake. Some flooding-tolerant tree species including tamarack (Larix laricina (Du Roi) K. Koch) produce adventitious roots in response to flooding. These roots were reported to have higher hydraulic conductivity under flooding conditions compared with non-adventitious roots. In the present study, we examined structural and functional modifications in adventitious roots of tamarack seedlings to explain their flooding tolerance. Results: Seedlings were subjected to the flooding treatment for six months, which resulted in an almost complete disintegration of the existing root system and its replacement with adventitious roots. We compared gas exchange parameters and water relations of flooded plants with the plants growing in well-drained soil and examined the root structures and root water transport properties. Although flooded seedlings had lower needle chlorophyll concentrations, their stomatal conductance, net photosynthesis rates and shoot water potentials were similar to non-flooded plants, indicative of flooding tolerance. Flooded adventitious roots had higher activation energy and a higher ratio of apoplastic to cell-to-cell water flow compared with non-flooded control roots as determined with the 1-hydroxypirene 3,6,8-trisulfonic acid apoplastic tracer dye. The adventitious roots in flooded plants also exhibited retarded xylem and endodermal development and accumulated numerous starch grains in the cortex. Microscopic examination of root sections treated with the PIP1 and PIP2 antibodies revealed high immunoreactivity in the cortex of non-flooded roots, as compared with flooded roots. Conclusions: Structural modifications of adventitious roots suggest increased contribution of apoplastic bypass to water flow. The reduced dependence of roots on the hypoxia-sensitive aquaporin-mediated water transport is likely among the main mechanisms allowing tamarack seedlings to maintain water balance and gas exchange under flooding conditions.
Date created
2012
DOI
doi:10.7939/R3V97ZR19
License information
Rights
© 2012 Calvo-Polanco et al.; licensee BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Citation for previous publication
Calvo-Polanco M., Señorans J., Zwiazek J.J. (2012). Role of adventitious roots in water relations of tamarack (Larix laricina) seedlings exposed to flooding. BMC Plant Biology, 12(99), 1-9. doi:10.1186/1471-2229-12-99.
Source
Link to related item

File Details

Date Uploaded
Date Modified
2014-04-24T22:49:55.295+00:00
Audit Status
Audits have not yet been run on this file.
Characterization
File format: pdf (Portable Document Format)
Mime type: application/pdf
File size: 1685149
Last modified: 2015:10:12 11:58:53-06:00
Filename: BMCPB_12_2012_99.pdf
Original checksum: 32bf4e3310fb998981899494bedd9502
Copyright note: ??? 2012 Calvo-Polanco et al.; licensee BioMed Central Ltd.
Well formed: true
Valid: true
File title: Abstract
File title: Role of adventitious roots in water relations of tamarack (Larix laricina) seedlings exposed to flooding
File author: M���nica Calvo-Polanco
File author: M???nica Calvo-Polanco
File author: Mnica Calvo-Polanco
Page count: 9
Activity of users you follow
User Activity Date