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JXB Advance Access originally published online on June 4, 2009
Journal of Experimental Botany 2009 60(9):2454-2459; doi:10.1093/jxb/erp192
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© The Author [2009]. Published by Oxford University Press [on behalf of the Society for Experimental Biology]. All rights reserved. For Permissions, please e-mail: journals.permissions@oxfordjournals.org

eXtra Botany

Rhizosphere manipulations to maximize ‘crop per drop’ during deficit irrigation

Ian C. Dodd*

The Lancaster Environment Centre, Lancaster University, Lancaster LA1 4YQ, UK

* E-mail: I.Dodd@lancaster.ac.uk

The first 150 words of the full text of this article appear below.

Although much of global agriculture is rain-fed, production is frequently (and sometimes catastrophically) constrained by rainfall. Supplementary irrigation can stabilize yield from year-to-year and conventionally has aimed to meet full crop evapotranspiration (ET), since the relationship between ET and crop yield is near-linear at suboptimal water supply (Fereres and Soriano, 2007). Changes in climate (rainfall patterns) and/or resource management (irrigation quotas) will mean that future crops, either unintentionally or deliberately, will receive deficit irrigation (DI, less water than crop ET), necessarily drying the soil, limiting leaf expansion and gas exchange and, consequently, yield.

Although decreased cellular turgor can limit leaf growth and gas exchange, under many circumstances plant roots can sense drying soil, and transmit chemical signals to the shoots to regulate their physiology (Davies and Zhang, 1991; Dodd et al., 1996). Much work has aimed to substantiate this ‘chemical signalling hypothesis’ by determining . . . [Full Text of this Article]


   Comparing agronomic responses to partial rootzone drying and deficit irrigation
 

   Long-distance signalling during partial rootzone drying and deficit irrigation
 

   Rhizosphere and microbial responses to alternate wetting and drying
 

   Rhizosphere engineering to manipulate long-distance signalling
 

   The challenges
 

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