Cover illustration: Scaled-up Feulgen staining allows easy detection of early stages of symbiotic nodule development in pea (Pisum sativum L.) on a whole root and quantification of the effect of factors influencing symbiosis initiation. Nodules seven days after inoculation with a bacterium Rhizobium leguminosarum bv. viciae, strain 128C30. (See Novák et al., pp. 1735–1745.)
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