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Review: An integrated framework for crop adaptation to dry environments: Responses to transient and terminal drought

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Relation http://oar.icrisat.org/9947/
http://doi.org/10.1016/j.plantsci.2016.09.007
10.1016/j.plantsci.2016.09.007
 
Title Review: An integrated framework for crop adaptation to dry environments: Responses to transient and terminal drought
 
Creator Berger, J
Palta, J
Vadez, V
 
Subject Abiotic Stress
Drought Tolerance
Crop Physiology
Drought
 
Description As the incidence of water deficit and heat stress increases in many production regions there is an increasing requirement for crops adapted to these stresses. Thus it is essential to match water supply and demand, particularly during grain-filling. Here we integrate Grime’s ecological strategies approach with traditional drought resistance/yield component frameworks describing plant responses to water deficit. We demonstrate that water use is a function of both short and longer term trade-offs between competing demands for carbon. Agricultural crop adaptation is based on escape. Rapid growth rates and high reproductive investment maximize yield, and stress is avoided through a closely regulated, climate-appropriate annual phenology. Crops have neither the resources nor morphological capacity to withstand long periods of intense water deficit. Thus, under terminal drought, yield potential is traded off against drought escape, such that drought postponing and/or tolerance traits which extend the growing season and/or divert source from reproductive sinks are maladaptive. However, these traits do play a supporting role against transient water deficits, allowing longer season cultivars to survive by mining water through deeper roots, or restricting transpiration. Recognizing these trade-offs made within escape-strategy limits will allow breeders to integrate complementary adaptive traits to transient and terminal water deficits.
 
Publisher Elsevier
 
Date 2016-12
 
Type Article
PeerReviewed
 
Format application/pdf
 
Language en
 
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Identifier http://oar.icrisat.org/9947/1/1-s2.0-S0168945216304678-main.pdf
Berger, J and Palta, J and Vadez, V (2016) Review: An integrated framework for crop adaptation to dry environments: Responses to transient and terminal drought. Plant Science, 253. pp. 58-67. ISSN 0168-9452