eprintid: 10707
rev_number: 13
eprint_status: archive
userid: 1305
dir: disk0/00/01/07/07
datestamp: 2018-06-12 10:02:42
lastmod: 2018-06-12 10:02:42
status_changed: 2018-06-12 10:02:42
type: conference_item
metadata_visibility: show
creators_name: Vadez, V
creators_name: Kholova, J
creators_name: Choudhary, S
creators_name: Cooper, M
creators_name: Messina, C
creators_name: Prandavada, A
icrisatcreators_name: Vadez, V
icrisatcreators_name: Kholova, J
affiliation: ICRISAT (Patancheru)
affiliation: Pioneer Hibred, Hyderabad Research Station (Telangana)
affiliation: DuPont Pioneer (Johnston)
country: India
country: USA
title: Transpiration efficiency: further insights from species, sink strength, and soil comparisons
ispublished: pub
subjects: PLB1
subjects: S1.5.1
subjects: s1.4
subjects: s2.18
divisions: CRPS4
full_text_status: public
pres_type: paper
keywords: High vapor pressure deficit, VPD, Transpiration efficiency
abstract: 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
date_type: published
pagerange: P-039
event_title: InterDrought-V
event_location: Hyderabad, India
event_dates: February 21-25, 2017
event_type: conference
refereed: TRUE
related_url_url: http://idv.ceg.icrisat.org/wp-content/uploads/2017/02/Abstract_Book_Final.pdf
related_url_type: org
citation:   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.     
document_url: http://oar.icrisat.org/10707/1/218.pdf