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Transpiration difference under high evaporative demand in chickpea ( Cicer arietinum L.) may be explained by differences in the water transport pathway in the root cylinder

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Relation http://oar.icrisat.org/11620/
https://doi.org/10.1111/plb.13147
doi:10.1111/plb.13147
 
Title Transpiration difference under high evaporative demand in chickpea ( Cicer arietinum L.) may be explained by differences in the water transport pathway in the root cylinder
 
Creator Sivasakthi, K
Tharanya, M
Zaman‐Allah, M
Kholová, J
Thirunalasundari, T
Vadez, V
 
Subject Crop Physiology
Chickpea
Drought
Water Conservation
 
Description Terminal drought substantially reduces chickpea yield. Reducing water use at vegetative
stage by reducing transpiration under high vapor pressure deficit (VPD), i.e. under dry/
hot conditions, contributes to drought adaptation. We hypothesized that this trait could
relate to differences in a genotype’s dependence on root water transport pathways and
hydraulics.
• Transpiration rate responses in conservative and profligate chickpea genotypes were
evaluated under increasing VPD in the presence/absence of apoplastic and cell-to-cell
transport inhibitors.
• Conservative genotypes ICC 4958 and ICC 8058 restricted transpiration under high
VPD compared to the profligate genotypes ICC 14799 and ICC 867. Profligate genotypes
were more affected by aquaporin inhibition of the cell-to-cell pathway than conservative
genotypes, as measured by the root hydraulic conductance and transpiration
under high VPD. Aquaporin inhibitor treatment also led to a larger reduction in root
hydraulic conductivity in profligate than in conservative genotypes. In contrast, blockage
of the apoplastic pathway in roots decreased transpiration more in conservative
than in profligate genotypes. Interestingly, conservative genotypes had high early vigour,
whereas profligate genotypes had low early vigour.
• In conclusion, profligate genotypes depend more on the cell-to-cell pathway, which
might explain their higher root hydraulic conductivity, whereas water-saving by
restricting transpiration led to higher dependence on the apoplastic pathway. This
opens the possibility to screen for conservative or profligate chickpea phenotypes using
inhibitors, itself opening to the search of the genetic basis of these differences.
 
Publisher Wiley
 
Date 2020-06
 
Type Article
PeerReviewed
 
Format application/pdf
 
Language en
 
Identifier http://oar.icrisat.org/11620/1/plb.13147.pdf
Sivasakthi, K and Tharanya, M and Zaman‐Allah, M and Kholová, J and Thirunalasundari, T and Vadez, V (2020) Transpiration difference under high evaporative demand in chickpea ( Cicer arietinum L.) may be explained by differences in the water transport pathway in the root cylinder. Plant Biology (TSI). pp. 769-780. ISSN 1435-8603