| Abstract Detail
Water Relations Gorska, Anna [1], Ye, Qing [2], Holbrook, Noel [3], Zwieniecki, Maciej A. [2]. Water channels activity is regulated by endogenous NO3- ions level in tomato and cucumber roots. In well aerated, non acidic soils mineralization process of nitrogen is mostly halted at nitrate. Thus, very often NO3- ions are main source of nitrogen available to plants in reach ecosystems and agricultural land. Roots respond to nitrate presence by induction of nitrate transport system and their assimilation pathway. However, immediate consequence of increased uptake rate is decreased nitrate concentration around the root surface that can make acquisition less efficient. This problem could be solve if plants were able to enhance the water uptake from the same volume of soil causing mass flow that would bring more NO3- ions to the root surface. We present data showing nitrate-induced hydraulic response of root resulting in fast (minutes) and significant (30-40%) increase hydraulic conductivity in cucumber and tomato. Additionally our results with sodium tungstate (nitrate reductase inhibitor) in combination with determination of cell level response to exogenous and endogenous application of nitrate provide evidences that endogenous nitrate (not its assimilation products) triggers that response.
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1 - Arnold Arboretum of Harvard University, 3111 Biological Laboratories, 16 Divinity Avenue, Cambridge, MA, 02138, USA
2 - Arnold Arboretum of Harvard University
3 - Harvard University, Organismic and Evolutionary Biology
Keywords:
nitrate
water channels.
Presentation Type: Plant Biology Abstract
Session: P
Location: Exhibit Hall (Northeast, Southwest & Southeast)/Hilton
Date: Sunday, July 8th, 2007
Time: 8:00 AM
Number: P09016
Abstract ID:1253 |
