Advanced

Transpiration efficiency: new insights into an old story

Vadez, Vincent; Kholova, Jana; Medina, Susan; Kakkera, Aparna and Anderberg, Hanna LU (2014) In Journal of Experimental Botany 65(21). p.6141-6153
Abstract
Producing more food per unit of water has never been as important as it is at present, and the demand for water by economic sectors other than agriculture will necessarily put a great deal of pressure on a dwindling resource, leading to a call for increases in the productivity of water in agriculture. This topic has been given high priority in the research agenda for the last 30 years, but with the exception of a few specific cases, such as water-use-efficient wheat in Australia, breeding crops for water-use efficiency has yet to be accomplished. Here, we review the efforts to harness transpiration efficiency (TE); that is, the genetic component of water-use efficiency. As TE is difficult to measure, especially in the field, evaluations of... (More)
Producing more food per unit of water has never been as important as it is at present, and the demand for water by economic sectors other than agriculture will necessarily put a great deal of pressure on a dwindling resource, leading to a call for increases in the productivity of water in agriculture. This topic has been given high priority in the research agenda for the last 30 years, but with the exception of a few specific cases, such as water-use-efficient wheat in Australia, breeding crops for water-use efficiency has yet to be accomplished. Here, we review the efforts to harness transpiration efficiency (TE); that is, the genetic component of water-use efficiency. As TE is difficult to measure, especially in the field, evaluations of TE have relied mostly on surrogate traits, although this has most likely resulted in over-dependence on the surrogates. A new lysimetric method for assessing TE gravimetrically throughout the entire cropping cycle has revealed high genetic variation in different cereals and legumes. Across species, water regimes, and a wide range of genotypes, this method has clearly established an absence of relationships between TE and total water use, which dismisses previous claims that high TE may lead to a lower production potential. More excitingly, a tight link has been found between these large differences in TE in several crops and attributes of plants that make them restrict water losses under high vapour-pressure deficits. This trait provides new insight into the genetics of TE, especially from the perspective of plant hydraulics, probably with close involvement of aquaporins, and opens new possibilities for achieving genetic gains via breeding focused on this trait. Last but not least, small amounts of water used in specific periods of the crop cycle, such as during grain filling, may be critical. We assessed the efficiency of water use at these critical stages. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Aquaporins, carbon-isotope discrimination, CID, drought, grain filling, hydraulics, post-anthesis water use, vapour-pressure deficit, VPD, water, stress
in
Journal of Experimental Botany
volume
65
issue
21
pages
6141 - 6153
publisher
Oxford University Press
external identifiers
  • wos:000348150900002
  • scopus:84907661455
ISSN
0022-0957
DOI
10.1093/jxb/eru040
language
English
LU publication?
yes
id
075c0571-df05-4511-a10b-5750afe41037 (old id 5204298)
date added to LUP
2015-03-25 14:16:29
date last changed
2017-10-29 03:07:35
@article{075c0571-df05-4511-a10b-5750afe41037,
  abstract     = {Producing more food per unit of water has never been as important as it is at present, and the demand for water by economic sectors other than agriculture will necessarily put a great deal of pressure on a dwindling resource, leading to a call for increases in the productivity of water in agriculture. This topic has been given high priority in the research agenda for the last 30 years, but with the exception of a few specific cases, such as water-use-efficient wheat in Australia, breeding crops for water-use efficiency has yet to be accomplished. Here, we review the efforts to harness transpiration efficiency (TE); that is, the genetic component of water-use efficiency. As TE is difficult to measure, especially in the field, evaluations of TE have relied mostly on surrogate traits, although this has most likely resulted in over-dependence on the surrogates. A new lysimetric method for assessing TE gravimetrically throughout the entire cropping cycle has revealed high genetic variation in different cereals and legumes. Across species, water regimes, and a wide range of genotypes, this method has clearly established an absence of relationships between TE and total water use, which dismisses previous claims that high TE may lead to a lower production potential. More excitingly, a tight link has been found between these large differences in TE in several crops and attributes of plants that make them restrict water losses under high vapour-pressure deficits. This trait provides new insight into the genetics of TE, especially from the perspective of plant hydraulics, probably with close involvement of aquaporins, and opens new possibilities for achieving genetic gains via breeding focused on this trait. Last but not least, small amounts of water used in specific periods of the crop cycle, such as during grain filling, may be critical. We assessed the efficiency of water use at these critical stages.},
  author       = {Vadez, Vincent and Kholova, Jana and Medina, Susan and Kakkera, Aparna and Anderberg, Hanna},
  issn         = {0022-0957},
  keyword      = {Aquaporins,carbon-isotope discrimination,CID,drought,grain filling,hydraulics,post-anthesis water use,vapour-pressure deficit,VPD,water,stress},
  language     = {eng},
  number       = {21},
  pages        = {6141--6153},
  publisher    = {Oxford University Press},
  series       = {Journal of Experimental Botany},
  title        = {Transpiration efficiency: new insights into an old story},
  url          = {http://dx.doi.org/10.1093/jxb/eru040},
  volume       = {65},
  year         = {2014},
}