A Comparison of the Growth, Photosynthesis, Stomatal Conductance and Water Use Efficiency of Moricandia and Brassica Species |
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Authors: | McVETTY, P. B. E. AUSTIN, R. B. MORGAN, C. L. |
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Affiliation: | Institute of Plant Science Research (Cambridge Laboratory) Cambridge CB2 2LQ, UK * On study leave from Department of Plant Science, University of Manitoba Winnipeg, Manitoba, Canada R3T 2N2 |
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Abstract: | When grown in pots and well-watered, the relative growth ratesof the above ground parts of two species of Moricandia (M. arvensis,an intermediate C3C4 species, and M. moricandioides,a C3 species) were inferior to those of two cultivated Brassicaspecies (B. campestris and B. napus). The Moricandia specieshad thicker leaves (greater d.wt per unit leaf area) with morechlorophyll than the Brassica species and had slightly greaterrates of photosynthesis per unit leaf area at an irradiance(400700 nm) of 2000 µmol quanta m2 s 1.Leaves of M. arvensis, known to have a CO2 compensation pointbetween that of C3 and C4 species, had a lower ratio of theintercellular to atmospheric partial pressure of CO2 (C1/Ca)and a greater instantaneous water use efficiency (WUE) thanthose of M. moricandioides and the Brassica species. Carbon isotope discrimination ( |
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