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Transpiration efficiency: further insights from species, sink strength, and soil comparisons

OAR@ICRISAT

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Relation http://oar.icrisat.org/10707/
 
Title Transpiration efficiency: further insights from species, sink strength, and soil comparisons
 
Creator Vadez, V
Kholova, J
Choudhary, S
Cooper, M
Messina, C
Prandavada, A
 
Subject Plant Breeding
Pearl Millet
Sorghum
Plant Physiology
 
Description During ID-IV we reported that TE was closely related to the capacity
to restrict transpiration under high vapor pressure deficit
(VPD). Experiments were undertaken to evaluate other possible
factors influencing TE. Experiments across seasons varying
in VPD conditions and across water regimes showed that
maize had a higher TE than sorghum and pearl millet. While
C4 cereals should, theoretically, have similar TE, 100 years of
breeding in maize could be responsible for these differences,
possibly from increased rates of carbon fixation deriving from
selective pressure underincreased planting densities. These
results then open an opportunity to accelerate breeding in
sorghum and pearl millet by specifically targeting the possible
reasons for these differences (RUE, density “resistance”). Further
experimentation was undertaken in which ears and panicles
were severed from the plants and showed that TE was depressed
in maize and sorghum, respectively, while it was not in
pearl millet, which produced many new tillers and nodal tillers.
This work then raised the question of source-sink relationship
in setting carbon demand and then photosynthetic activity. Finally,
TE assessed in C4 cereals, grown in four different soils
and two different VPD seasons, showed large TE differences
among soils during the high VPD season, with a degree of species-by-soil
interaction. We interpret these differences to be a
consequence of different hydraulic soil properties likely affecting
the transpiration response under high VPD. Results will be
discussed with regard to breeding targets in “less-bred” crops
(pearl millet, sorghum) and with regards to better understanding
GxExM interactions.
 
Date 2017-02
 
Type Conference or Workshop Item
PeerReviewed
 
Format application/pdf
 
Language en
 
Rights —
 
Identifier http://oar.icrisat.org/10707/1/218.pdf
Vadez, V and Kholova, J and Choudhary, S and Cooper, M and Messina, C and Prandavada, A (2017) Transpiration efficiency: further insights from species, sink strength, and soil comparisons. In: InterDrought-V, February 21-25, 2017, Hyderabad, India.