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Comparison of three C4 cereals for transpirational sensitivity to elevated evaporative demand

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Relation http://oar.icrisat.org/10701/
 
Title Comparison of three C4 cereals for transpirational sensitivity to elevated evaporative demand
 
Creator Choudhary, S
Vadez, V
Anand, A
Messina, C
Cooper, M
 
Subject Abiotic Stress
Pearl Millet
 
Description Maize, sorghum and pearl-millet are leading C4 cereals for tropical
regions where evaporative demand is high. The transpiration
response to high VPD and leaf area of plants grown under different
VPD conditions was compared among species to assess
the degree of water conservation of these crops and then their
potential fitness to different stress scenarios. Ten genotypes of
each species were grown under moderate (2.2-2.8kPa) and high
VPD (3.9-4.5kPa) conditions till early vegetative (V5-V7) stage
with no water-limitation. At that stage transpiration was measured
under elevating VPD (0.9-4.1kPa) in controlled conditions.
All three species grown under moderate VPD conditions showed
a variation in transpiration restriction above 3.0kPa, although the
decrease in transpiration above 3.0kPa was high in the case of
maize. Sorghum and pearl-millet grown under high VPD conditions
showed significant reduction in leaf area whereas maize
showed trivial differences in leaf area across VPD conditions.
Therefore, under high evaporative demand when soil water was
not limiting, maize saved water only by restricting water use
during pre-flowering stages whereas sorghum and pearl millet
bothreduced canopy sizeand transpiration under high VPD.
The soil moisture thresholds where transpiration declined upon
progressive water stress imposition did not differ significantly,
regardless of different VPD in the growing conditions. Maize had
also higher TE than sorghum and millet in the high VPD conditions.
Therefore, water conserved in maize by restricted transpiration
in high VPD condition, probably leading to higher TE, was
sufficiently rewarded to sustain biomass accumulation in water
stress period.
 
Date 2017-02
 
Type Conference or Workshop Item
PeerReviewed
 
Format application/pdf
 
Language en
 
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Identifier http://oar.icrisat.org/10701/1/195.pdf
Choudhary, S and Vadez, V and Anand, A and Messina, C and Cooper, M (2017) Comparison of three C4 cereals for transpirational sensitivity to elevated evaporative demand. In: InterDrought-V, February 21-25, 2017, Hyderabad, India.