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Plants of Psoralea subacaulis were grown under three light regimes, 15, 40, and 100% full sunlight, and the photosynthetic rates were measured at 18° and 25°C at various light intensities and that it does poorly in the shade. Field observations that P. subacaulis is an obligate heliophyte are thus verified.
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Baskin et al. (1968) studied this question.
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