Root cortical burden influences drought tolerance in maize

Raúl E. Jaramillo, Eric A. Nord, Joseph G. Chimungu, Kathleen M. Brown, Jonathan P. Lynch

Research output: Contribution to journalArticle

50 Citations (Scopus)

Abstract

Background and AimsRoot cortical aerenchyma (RCA) increases water and nutrient acquisition by reducing the metabolic costs of soil exploration. In this study the hypothesis was tested that living cortical area (LCA; transversal root cortical area minus aerenchyma area and intercellular air space) is a better predictor of root respiration, soil exploration and, therefore, drought tolerance than RCA formation or root diameter.MethodsRCA, LCA, root respiration, root length and biomass loss in response to drought were evaluated in maize (Zea mays) recombinant inbred lines grown with adequate and suboptimal irrigation in soil mesocosms.Key ResultsRoot respiration was highly correlated with LCA. LCA was a better predictor of root respiration than either RCA or root diameter. RCA reduced respiration of large-diameter roots. Since RCA and LCA varied in different parts of the root system, the effects of RCA and LCA on root length were complex. Greater crown-root LCA was associated with reduced crown-root length relative to total root length. Reduced LCA was associated with improved drought tolerance.ConclusionsThe results are consistent with the hypothesis that LCA is a driver of root metabolic costs and may therefore have adaptive significance for water acquisition in drying soil.

Original languageEnglish (US)
Pages (from-to)429-437
Number of pages9
JournalAnnals of botany
Volume112
Issue number2
DOIs
StatePublished - Jul 1 2013

Fingerprint

drought tolerance
corn
tree crown
soil
soil respiration
inbred lines
root systems
Zea mays
water
drying
drought
irrigation
air

All Science Journal Classification (ASJC) codes

  • Plant Science

Cite this

Jaramillo, Raúl E. ; Nord, Eric A. ; Chimungu, Joseph G. ; Brown, Kathleen M. ; Lynch, Jonathan P. / Root cortical burden influences drought tolerance in maize. In: Annals of botany. 2013 ; Vol. 112, No. 2. pp. 429-437.
@article{a8e9f39712f14da797f77777d0d81963,
title = "Root cortical burden influences drought tolerance in maize",
abstract = "Background and AimsRoot cortical aerenchyma (RCA) increases water and nutrient acquisition by reducing the metabolic costs of soil exploration. In this study the hypothesis was tested that living cortical area (LCA; transversal root cortical area minus aerenchyma area and intercellular air space) is a better predictor of root respiration, soil exploration and, therefore, drought tolerance than RCA formation or root diameter.MethodsRCA, LCA, root respiration, root length and biomass loss in response to drought were evaluated in maize (Zea mays) recombinant inbred lines grown with adequate and suboptimal irrigation in soil mesocosms.Key ResultsRoot respiration was highly correlated with LCA. LCA was a better predictor of root respiration than either RCA or root diameter. RCA reduced respiration of large-diameter roots. Since RCA and LCA varied in different parts of the root system, the effects of RCA and LCA on root length were complex. Greater crown-root LCA was associated with reduced crown-root length relative to total root length. Reduced LCA was associated with improved drought tolerance.ConclusionsThe results are consistent with the hypothesis that LCA is a driver of root metabolic costs and may therefore have adaptive significance for water acquisition in drying soil.",
author = "Jaramillo, {Ra{\'u}l E.} and Nord, {Eric A.} and Chimungu, {Joseph G.} and Brown, {Kathleen M.} and Lynch, {Jonathan P.}",
year = "2013",
month = "7",
day = "1",
doi = "10.1093/aob/mct069",
language = "English (US)",
volume = "112",
pages = "429--437",
journal = "Annals of Botany",
issn = "0305-7364",
publisher = "Oxford University Press",
number = "2",

}

Root cortical burden influences drought tolerance in maize. / Jaramillo, Raúl E.; Nord, Eric A.; Chimungu, Joseph G.; Brown, Kathleen M.; Lynch, Jonathan P.

In: Annals of botany, Vol. 112, No. 2, 01.07.2013, p. 429-437.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Root cortical burden influences drought tolerance in maize

AU - Jaramillo, Raúl E.

AU - Nord, Eric A.

AU - Chimungu, Joseph G.

AU - Brown, Kathleen M.

AU - Lynch, Jonathan P.

PY - 2013/7/1

Y1 - 2013/7/1

N2 - Background and AimsRoot cortical aerenchyma (RCA) increases water and nutrient acquisition by reducing the metabolic costs of soil exploration. In this study the hypothesis was tested that living cortical area (LCA; transversal root cortical area minus aerenchyma area and intercellular air space) is a better predictor of root respiration, soil exploration and, therefore, drought tolerance than RCA formation or root diameter.MethodsRCA, LCA, root respiration, root length and biomass loss in response to drought were evaluated in maize (Zea mays) recombinant inbred lines grown with adequate and suboptimal irrigation in soil mesocosms.Key ResultsRoot respiration was highly correlated with LCA. LCA was a better predictor of root respiration than either RCA or root diameter. RCA reduced respiration of large-diameter roots. Since RCA and LCA varied in different parts of the root system, the effects of RCA and LCA on root length were complex. Greater crown-root LCA was associated with reduced crown-root length relative to total root length. Reduced LCA was associated with improved drought tolerance.ConclusionsThe results are consistent with the hypothesis that LCA is a driver of root metabolic costs and may therefore have adaptive significance for water acquisition in drying soil.

AB - Background and AimsRoot cortical aerenchyma (RCA) increases water and nutrient acquisition by reducing the metabolic costs of soil exploration. In this study the hypothesis was tested that living cortical area (LCA; transversal root cortical area minus aerenchyma area and intercellular air space) is a better predictor of root respiration, soil exploration and, therefore, drought tolerance than RCA formation or root diameter.MethodsRCA, LCA, root respiration, root length and biomass loss in response to drought were evaluated in maize (Zea mays) recombinant inbred lines grown with adequate and suboptimal irrigation in soil mesocosms.Key ResultsRoot respiration was highly correlated with LCA. LCA was a better predictor of root respiration than either RCA or root diameter. RCA reduced respiration of large-diameter roots. Since RCA and LCA varied in different parts of the root system, the effects of RCA and LCA on root length were complex. Greater crown-root LCA was associated with reduced crown-root length relative to total root length. Reduced LCA was associated with improved drought tolerance.ConclusionsThe results are consistent with the hypothesis that LCA is a driver of root metabolic costs and may therefore have adaptive significance for water acquisition in drying soil.

UR - http://www.scopus.com/inward/record.url?scp=84880278874&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84880278874&partnerID=8YFLogxK

U2 - 10.1093/aob/mct069

DO - 10.1093/aob/mct069

M3 - Article

C2 - 23618897

AN - SCOPUS:84880278874

VL - 112

SP - 429

EP - 437

JO - Annals of Botany

JF - Annals of Botany

SN - 0305-7364

IS - 2

ER -