Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
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TY - JOUR
T1 - Using X-ray computed tomography to explore the role of abscisic acid in moderating the impact of soil compaction on root system architecture
AU - Tracy, Saoirse R.
AU - Black, Colin R.
AU - Roberts, Jeremy A.
AU - Dodd, Ian C.
AU - Mooney, Sacha J.
PY - 2015/2
Y1 - 2015/2
N2 - Background and Airns: Understanding how soil compaction affects root system architecture (RSA) and root deployment within soil is critical to maximise crop growth. This study examined the role of abscisic acid (ABA) in mediating root responses to soil compaction using tomato genotypes with differing endogenous ABA concentrations.Methods: Plants of the wild-type tomato genotype (Solanum lycopersicum L. cv. Ailsa Craig) and its ABA-deficient mutant notabilis, of uniform developmental stage, were transplanted to columns containing a loamy sand soil at bulk densities of 1.2, 1.4 and 1.6 Mg m(-3). Fourteen days after transplanting (DAT), an X-ray mu CT scanner acquired non-destructive 3-D images of RSA. Destructive analysis of RSA was undertaken using WinRHIZO((R)) 2-D scanning equipment.Key results: Increased bulk density decreased root volume, surface area, rooting depth and lateral root number (P<0.05), which adversely affected RSA and the subsequent volume of soil explored. The ABA-deficient mutant notabilis displayed a poor rooting phenotype with reduced root volume, surface area and lateral roots at all bulk densities.Conclusions: The response of RSA to soil compaction in situ differed between the ABA-deficient mutant genotypes of tomato. The differences in rooting phenotype between genotypes suggest that endogenous ABA concentration has a positive influence on RSA when roots encounter compacted soil. (C) 2014 Elsevier B.V. All rights reserved.
AB - Background and Airns: Understanding how soil compaction affects root system architecture (RSA) and root deployment within soil is critical to maximise crop growth. This study examined the role of abscisic acid (ABA) in mediating root responses to soil compaction using tomato genotypes with differing endogenous ABA concentrations.Methods: Plants of the wild-type tomato genotype (Solanum lycopersicum L. cv. Ailsa Craig) and its ABA-deficient mutant notabilis, of uniform developmental stage, were transplanted to columns containing a loamy sand soil at bulk densities of 1.2, 1.4 and 1.6 Mg m(-3). Fourteen days after transplanting (DAT), an X-ray mu CT scanner acquired non-destructive 3-D images of RSA. Destructive analysis of RSA was undertaken using WinRHIZO((R)) 2-D scanning equipment.Key results: Increased bulk density decreased root volume, surface area, rooting depth and lateral root number (P<0.05), which adversely affected RSA and the subsequent volume of soil explored. The ABA-deficient mutant notabilis displayed a poor rooting phenotype with reduced root volume, surface area and lateral roots at all bulk densities.Conclusions: The response of RSA to soil compaction in situ differed between the ABA-deficient mutant genotypes of tomato. The differences in rooting phenotype between genotypes suggest that endogenous ABA concentration has a positive influence on RSA when roots encounter compacted soil. (C) 2014 Elsevier B.V. All rights reserved.
KW - Abscisic acid (ABA)
KW - Root system architecture
KW - Soil compaction
KW - Solanum lycopersicum
KW - Computed TomographyROIRegion of interest
KW - TOMATO SOLANUM-LYCOPERSICON
KW - LOW WATER POTENTIALS
KW - VULGARE L GROWTH
KW - LEAF EXPANSION
KW - SHOOT GROWTH
KW - ABA
KW - PLANT
KW - ETHYLENE
KW - ELONGATION
KW - STRESS
U2 - 10.1016/j.envexpbot.2014.09.003
DO - 10.1016/j.envexpbot.2014.09.003
M3 - Journal article
VL - 110
SP - 11
EP - 18
JO - Environmental and Experimental Botany
JF - Environmental and Experimental Botany
SN - 0098-8472
ER -