Experimental studies on leafy spurge (Euphorbia esula). IV. Cytohistological changes in the cotyledonary shoots following decapitation

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Abstract
Cytological and histological studies were conducted on cotyledonary shoots of leafy spurge (Euphorbia esula L.) after the removal of the epicotyl. Growth owing to cell elongation was observed as early as 4 h in the proximal part of the shoot. Nuclear divisions were present in the distal part of the shoot and were not affected significantly by decapitation. They did not contribute to the early increase in length of the shoot. An increase of mitotic activity after 40 h and of shoot length after 72 h was observed; the latter was interpreted to be due to shoot xylem connections with the hypocotylary stele.

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