Annals of Botany 83: 117-128, 1999
© 1999 Annals of Botany Company
TheAfGene Regulates Timing and Direction of Major Developmental Events during Leaf Morphogenesis in Garden Pea (Pisum sativum)
Department of Biology, Augustana College, 639-38th Street, Rock Island, IL, 61201-2296, USA Department of Botany and Plant Sciences, University of California at Riverside, Riverside, CA, 92521, USA
July 7, 1998 ; September 10, 1998 . October 27, 1998
The wildtype leaf of the garden pea possesses proximal pairs of leaflets and distal pairs of tendrils in the blade region. Theafila (af) mutation causes leaflets to be replaced by compound (branched) tendrils. We characterized the morphological variation in leaf form along the plant axis and leaf development in early and late postembryonic leaves onafilaplants to infer the role of theAfgene. Leaf forms are more diverse early in shoot ontogeny onafilaplants.Afinfluences pinna length and pinna branching in addition to pinna type. Pinna initiation in the proximal region ofafilaleaf primordia is basipetal and delayed compared to wildtype plants. In addition, pinna development in the proximal region ofafilaleaves occurs for a longer period of time than on wildtype leaf primordia. Therefore,Afregulates the timing and direction of leaf developmental processes in the proximal region of the leaf, but has little effect on the distal region. These data support the heterochronic model of pea leaf morphogenesis proposed by Luet al. (International Journal of Plant Science157: 311355, 1996).Copyright 1999 Annals of Botany Company.
afila,Fabaceae, garden pea, heterochrony, leaf morphogenesis,Pisum sativum.
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