The determination of pea leaves, leaflets, and tendrils

Pea leaf determination was examined by culturing excised leaf, leaflet, and tendril primordia of different ages on a nutrient medium. Pinna primordia were designated as 1) determined, if they grew normally in culture; 2) undetermined, if they grew into differentiated structures that were morphologic...

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Bibliographic Details
Published in:American journal of botany 1994-03, Vol.81 (3), p.352-360
Main Authors: Gould, Kevin S., Cutter, Elizabeth G., J. Peter W. Young
Format: Article
Language:English
Subjects:
Agronomy. Soil science and plant productions
anatomia de la planta
anatomie vegetale
Anatomy
Biological and medical sciences
Botany
Callus
cultivo in vitro
culture in vitro
Developmental biology
feuille
Fundamental and applied biological sciences. Psychology
habitos de crecimiento
hojas
in vitro culture
Leaf primordia
Leaves
morfogenesis
morphogenese
morphogenesis
Morphology, anatomy, histology, cytology
Peas
Phenotypes
pisum sativum
plant anatomy
Plant cytology, morphology, systematics, chorology and evolution
Plant growth
plant habit
Plants
port de la plante
Spermatophyta
Structure and Development
Tendrils
vrille
zarcillo
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Summary:Pea leaf determination was examined by culturing excised leaf, leaflet, and tendril primordia of different ages on a nutrient medium. Pinna primordia were designated as 1) determined, if they grew normally in culture; 2) undetermined, if they grew into differentiated structures that were morphologically and anatomically different from either leaflet or tendril; or 3) partially determined, if the two pinnae of an opposite pair developed unequally in isolation, or for leaflet pinnae only, if laminae were initiated but did not develop completely. The compound pea leaf as a whole is determined over four plastochrons of development. Proximal pinnae are determined during the second leaf plastochron, approximately 0.8 plastochron after their initiation. The second most proximal pair of pinnae is determined during the third plastochron, and the terminal portion of the rachis is determined last, during the fourth plastochron. Determination of leaflet dorsiventrality is gradual, requiring a critical minimum period with the leaf in physiological contact with the shoot system. The rachis primordium, when isolated from the shoot, does not affect determination of its pinnae as leaflets or tendrils. Afila and tendril-less homeotic mutations do not alter the timing of pinna determination.
ISSN:0002-9122
1537-2197
DOI:10.1002/j.1537-2197.1994.tb15454.x