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Role of LLD, a new locus for leaflet/pinna morphogenesis in Pisum sativum

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Title Role of LLD, a new locus for leaflet/pinna morphogenesis in Pisum sativum
 
Creator Prajapati, Seema
Kumar, Sushil
 
Subject Compound leaf morphogenesis
leaf/leaflet lamina development
LEAF-LET DEVELOPMENT gene
LLD function
lld mutation
pea leaf
Pisum sativum
pea leaflet morphogenesis model
 
Description Properties of a mutant at the LLD (LEAF-LET DEVELOPMENT) locus in pea Pisum sativum L. are reported in
this paper. Plants homozygous for the Mendelian recessive mutation lld bear leaves in which a few to many
leaflets are incompletely developed. Opposite pinnae of rachis nodes often formed fused incompletely developed
leaflets. The lld mutation was observed to abort pinna development at almost all morphogenetic stages. The lld
mutation demonstrated high penetrance and low expressivity. The phenotypes of lld plants in tl, tac, tl tac, tl af
and tl 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 in lld mutants was related to deficiency in vascular tissue growth.
The morphological and anatomical features of the leaflets formed on a tl 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.
Grateful thanks to the Department of Biotechnology, New Delhi for partial financial support
 
Date 2013-10-09T06:17:46Z
2013-10-09T06:17:46Z
2001
 
Type Article
 
Identifier Journal of Biosciences, 26(5): 607-625
http://hdl.handle.net/123456789/17
 
Language en
 
Publisher Indian Academy of Sciences