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(a) Stomatal apparatus of diploid plant from glasshouse (bar = 6.50 × 10-4 cm); (b) Stomatal apparatus of tetraploid plant from glasshouse (bar = 6.50 × 10-4 cm). Each stomatal apparatus was obtained from the same part of diploid 2(a) and tetraploid 2(b) leaves in the glasshouse
