Abstract
The net photosynthetic rate (F), transpiration rate (Q) and water use efficiency (F/Q) of oilseed rape (Brassica campestris L. cv. Span) was studied under a range of atmospheric conditions by gas exchange techniques. The plants were at the full bloom/pod initiation stage of development at the time of measurement. The environmental conditions consisted of various levels of photosynthetically active radiation (100 to 2800 (μmol m−2 s−1 PAK: 400–700 nm), air temperature (10 to 42°C) and vapour pressure deficit (0.7 to 2.1 kPa VPD). The peak values ofF were recorded at 1600 μmol m−2 s−1 PAR, 20°C air temperature and 1.2 kPa VPD of air in the chamber.
Q increased with increasing PAR, air temperature and VPD. However, theF/Q remained high and almost constant from 600 to 1600 μmol m−2 s−1 PAR, but declined at the low and high photon flux densities.F/Q decreased progressively with increase in air temperature and VPD of air in the chamber.
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Singh, D.P., Turner, N.C. & Rawson, H.M. Effects of radiation, temperature and humidity on photosynthesis, transpiration and water use efficiency of oilseed rape (Brassica campestris L.). Biol Plant 24, 130–135 (1982). https://doi.org/10.1007/BF02902859
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DOI: https://doi.org/10.1007/BF02902859