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Annals of Botany 85: 143-150, 2000
© 2000 Annals of Botany Company

A Maize Mutant with an Altered Vascular Pattern

MICHELA LANDONI, GIUSEPPE GAVAZZI, NICOLETTA RASCIO, FRANCESCA DALLA VECCHIA, GABRIELLA CONSONNI and SILVANA DOLFINI+

Dipartimento di Fisiologia delle Piante coltivate e Chimica agraria, Università degli Studi di Milano, Via Celoria 2, 20133, Milano, Italia Dipartimento di Biologia, Università degli Studi di Padova, Via Colombo 3, 35121, Padova, Italia Dipartimento di Genetica e di Biologia dei microrganismi, Università degli Studi di Milano, Via Celoria 26, 20133, Milano, Italia

July 23, 1999 ; August 17, 1999 . September 26, 1999

A recessive maize mutant with disrupted seedling development was isolated following transpositional mutagenesis with Mutator. This mutant, initially identified during germination on the basis of abnormal growth of the scutellar node, was designated lsn1 (l arge s cutellar n ode). The mutant seedling exhibits an enlarged primary root with a longitudinal groove and multiple separate root tips. The mutant root is shorter than normal, because of defective cell elongation, and lacks lateral roots. The mutant plant shows defective leaves and reduced internode elongation. Histological analyses on primary root, shoot, scutellar node and juvenile leaves revealed a series of defects, all related to an irregular differentiation of vascular elements. In addition, in situ hybridization of mutant leaves demonstrates an abnormal pattern of expression of Knotted-1, a marker of meristem function. The presence of multiple roots fused together can be interpreted as suppression of the negative control responsible for the differentiation of only one root primordium. Therefore, the data obtained on seedlings of lsn1 point to a relationship between meristem activity, vascular differentiation and auxin polar transport, and may allow the identification of a gene which is active during embryogenesis.Copyright 2000 Annals of Botany Company

Auxin, defective seedling, maize, meristem activity, vascular differentiation, Zea mays.


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