Carl-Otto Ottosen

Intermittent moisture supply induces drought priming responses in some heat-tolerant chickpea genotypes

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  • Givemore Munashe Makonya, University of Cape Town
  • ,
  • John B.O. Ogola, University of Venda
  • ,
  • A. Muthama Muasya, University of Cape Town, Univ Cape Town, University of Cape Town, Dept Biol Sci
  • ,
  • Olivier Crespo, University of Cape Town
  • ,
  • Sipho Maseko, Tshwane University of Technology
  • ,
  • Alex J. Valentine, Stellenbosch University, University of Stellenbosch
  • ,
  • Carl-Otto Ottosen
  • Eva S. K. Rosenqvist, University of Copenhagen
  • ,
  • Samson B.M. Chimphango, University of Cape Town
Heat and drought stresses are two abiotic factors that often occur simultaneously
and are predicted to increase, consequently hampering plant growth. Response
of different species to either stresses is well documented but information on the
response of the same genotypes to both stresses in chickpea (Cicer arietinum L.)
is limited.We aimed to determine whether previously noted heat-stress-tolerant
genotype (Acc#7) is drought tolerant, that heat-sensitive genotype (Acc#8) is
drought sensitive, and whether intermittent moisture supply at vegetative stage
would induce priming effect to later drought at flowering. At vegetative stage,
plants were divided into three groups, nonstressed (watered to 75% field capacity
[FC], severe water stress (moisture withholding for 14 d), and treated to 40% FC
throughout the experiment (mild stress), with recovery for the severely stressed
plants after which they were stressed (double stress) at flowering. Drought treatments
at vegetative and flowering growth stages decreased physiological parameters
and biomass accumulation in both genotypes except low water supply at
40% FC that decreased biomass in Acc#7 but not Acc#8. Double-drought stress
resulted in priming effect in Acc#7, having higher biomass, chlorophyll fluorescence,
stomatal conductance (gs), net photosynthesis, and relative water content
(RWC) vs. the introduction of stress only at flowering growth stage as well as
in comparison with Acc#8. These results showed that both Acc#7 and Acc#8 are
sensitive to drought, whereas after priming,Acc#7 is better acclimated to drought
than Acc#8 associated with osmotic adjustment on leaf RWC and higher capacity
to protect photosynthetic activity, making Acc#7 potentially ideal for areas
associated with intermittent drought spells.
OriginalsprogEngelsk
TidsskriftCrop Science
Vol/bind60
Nummer5
Sider (fra-til)2527-2542
Antal sider16
ISSN0011-183X
DOI
StatusUdgivet - sep. 2020

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