Differential improvement in transpiration efficiency of C3 and C4 crop plants under elevated CO2 conditions

N JYOTHI LAKSHMI; M VANAJA; S K YADAV; M MAHESWARI; AMOL PATIL; CH RAM PRASAD; P SATISH; B VENKATESWARLU

doi:10.56093/ijas.v84i3.38595

Authors

N JYOTHI LAKSHMI Central Research Institute for Dryland Agriculture, Santhoshnagar, Hyderabad 500 059
M VANAJA Central Research Institute for Dryland Agriculture, Santhoshnagar, Hyderabad 500 059
S K YADAV Central Research Institute for Dryland Agriculture, Santhoshnagar, Hyderabad 500 059
M MAHESWARI Central Research Institute for Dryland Agriculture, Santhoshnagar, Hyderabad 500 059
AMOL PATIL Central Research Institute for Dryland Agriculture, Santhoshnagar, Hyderabad 500 059
CH RAM PRASAD Central Research Institute for Dryland Agriculture, Santhoshnagar, Hyderabad 500 059
P SATISH Central Research Institute for Dryland Agriculture, Santhoshnagar, Hyderabad 500 059
B VENKATESWARLU Central Research Institute for Dryland Agriculture, Santhoshnagar, Hyderabad 500 059

https://doi.org/10.56093/ijas.v84i3.38595

Keywords:

Elevated CO2, Open Top Chambers, Pearl millet, Sunflower, Transpiration efficiency, Water use, Yield

Abstract

Sunflower plants (C₃) transpired more water than pearl millet (C₄) from seedling to maturity under ambient conditions. The transpiration (water use) at elevated CO₂ was lesser for pearl millet and higher for sunflower compared to ambient. Elevated atmospheric CO₂ increased TE more in pearl millet (21.9%) than in sunflower (10.5%) and decreased the TR or water transpired to produce dry mass by 18.1% in pearl millet and 9.7% in sunflower compared to ambient. As the CO₂ content of the air continues to rise, both sunflower (C₃) and pearl millet (C₄) agriculture crops will respond favorably by exhibiting increases in TE.

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