Charles C. Mann's article “Genetic engineers aim to soup up photosynthesis” (News Focus, 15 Jan. p. [314][1]) suggests an improved RuBisCO enzyme to “lower crops' need for nitrogen.” A second article by Dennis Normile (News Focus, 15 Jan. p. [313][2]) suggests that erect leaves are necessary
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Sinclair et al. (1999) studied this question.
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