Role ofLLD, a new locus for leaflet/pinna morphogenesis inPisum sativum |
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Authors: | Seema Prajapati Sushil Kumar |
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Institution: | (1) Central Institute of Medicinal and Aromatic Plants, 226 015 Lucknow, India;(2) JNU Campus, National Centre for Plant Genome Research, 110 067 New Delhi, India |
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Abstract: | Properties of a mutant at theLLD (LEAF-LET DEVELOPMENT) locus in peaPisum sativum L. are reported in this paper. Plants homozygous for the Mendelian recessive mutationlld bear leaves in which a few to many leaflets are incompletely developed. Opposite pinnae of rachis nodes often formed fused
incompletely developed leaflets. Thelld mutation was observed to abort pinna development at almost all morphogenetic stages. Thelld mutation demonstrated high penetrance and low expressivity. The phenotypes oflld plants intl, tac, tl tac, tl af andtl af tac backgrounds suggested that LLD function is involved in the separation of lateral adjacent blastozones differentiated on primary,
secondary and tertiary rachides and lamina development in leaflets. The aborted development of tendrils and leaflets inlld mutants was related to deficiency in vascular tissue growth. The morphological and anatomical features of the leaflets formed
on atl lld double mutant permitted a model of basipetal leaflet development. The key steps of leaflet morphogenesis include origin of
the lamina by splitting of a radially symmetrical growing pinna having abaxial outer surface, opposite to the vascular cylinder,
through an invaginational groove, differentiation of adaxial surface along the outer boundary of split tissue in the groove
and expansion of the lamina ridges so formed into lamina spans. |
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Keywords: | Compound leaf morphogenesis leaf/leaflet lamina development LEAF-LET DEVELOPMENT gene LLD function lld mutation pea leaf Pisum sativum pea leaflet morphogenesis model |
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