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An analysis of vascular system in the compound tendrilled afila leaf in Pisum sativum

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Title An analysis of vascular system in the compound tendrilled afila leaf in Pisum sativum
 
Creator Sharma, Vishakha
Kumar, Arvind
Kumar, Sushil
 
Subject afila
Dichotomous vein-divisions
Leaflet-development
Primary veins
Tendril
Vein redundancy
 
Description Recent work on the venation patterning and morphogenesis of leaf/leaflet has posed the question how different are these in tendrils, which are another type of vegetative lateral organ. Here, the venation patterns of leaflets, stipules and tendrils were compared in the model species, P. sativum. Unlike reticulated venation in leaflets and stipules, venation in tendrils comprised of one or more primary veins. A few secondaries were attached to a primary vein, mostly distally. Bilaterally symmetrical secondary veins were rare. The primary veins in tendrils were daughter strands from dichotomously divided mother veins in rachis, connected finally to vascular strands in stem. A tendril received primary vein from one or more mother strands. Some mother strands contributed primary veins to proximal, distal and terminal domain tendrils of af leaf. The tendrils shared the multi-primary vein character with stipules. Vein redundancy provided a mechanism for survival of tendril/leaf against injury to some of the veins/mother veins. The presence of aborted primary veins that did not reach apex, rows of cambium cells attached to primary vein(s) at apex, the pattern of attachment of primary veins to mother veins and cessation of vein growth in apical direction in aborted tendrils of af lld genotype indicated that the growth of primary veins and tendril was acropetal. Loss-of-function of AF extended the repression of TL and MFP genes on leaflet development from distal and apical domains to proximal domain of leaves in af mutants.
Thanks are due to the Director, NIPGR for facilities,
Council of Scientific and Industrial Research (CSIR)
and Indian National Science Academy for
scientistships to SK, to CSIR and SKAIRED for
postgraduate fellowships respectively to AK and VS.
 
Date 2015-12-28T07:26:01Z
2015-12-28T07:26:01Z
2014
 
Type Article
 
Identifier Indian J. Exp. Biol., 52(6): 664-668
0975-1009
http://172.16.0.77:8080/jspui/handle/123456789/458
http://nopr.niscair.res.in/handle/123456789/28874
 
Language en_US
 
Publisher National Institute of Science Communication and Information Resources-NISCAIR