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Organ-wise homologies of stipule, leaf and inflorescence between Pisum sativum genetic variants, Delonix regia and Caesalpinia bonduc indicate parallel evolution of morphogenetic regulation

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Title Organ-wise homologies of stipule, leaf and inflorescence between Pisum sativum genetic variants, Delonix regia and Caesalpinia bonduc indicate parallel evolution of morphogenetic regulation
 
Creator Sharma, Vishakha
Tripathi, Bhumi Nath
Kumar, Sushil
 
Subject Bracteolated flowers
COCHLEATA gene
Compound stipule
LEAFY gene
Parallel evolution
UNIFOLIATA gene
 
Description Accepted date: 13 February 2012
Plants of the garden pea Pisum sativum an annual Papilionaceae species which have a mutation in the COCHLEATA (COCH) gene bear compound stipules of leaf morphology and secondary inflorescences in which flowers are borne in axils of bracteoles on an inflorescence stem. In the wild-type P. sativum stipules are simple foliaceous and flowers are non-bracteolated. Mutants of the coch phenotype are not known in any other plant species. The COCH gene of P. sativum is not yet sequenced. Therefore whether or not the COCH gene is present in species other than P. sativum remains unknown. Based on the principle of parallel evolution, it is thought that there may be leguminous species that possess the coch phenotype. In search of coch species, the Leguminosae flora of Delhi was surveyed for species that demonstrate compound stipules and bracteolated inflorescences. Out of 124 reported in the Leguminosae flora of Delhi, only the perennial Caesalpinioideae tree species Delonix regia and the shrubby vine species Caesalpinia bonduc were observed to have features of the coch mutants of P. sativum. Since the traits of simple foliaceous stipules and bracteoleless secondary inflorescences of wild-type P. sativum are common to many species among more than 19,400 species of family Leguminosae, it is hypothesized that the COCH gene may be as common as the ubiquitously present LEAFY gene (orthologue of UNIFOLIATA gene of P. sativum) in angiosperms.
Thanks are due to the Director NIPGR for
facilities, the Indian National Science Academy and Council of Scientific and Industrial Research for scientistship schemes to S.K. and
to the SKA Institution for Research, Education and Development for a
postgraduate fellowship to V.S. We thank Forest Starr, Kim Starr and
Stephen H. Brown for their permission to use the photograph of
C. bonduc inflorescence as the plants of this species were not in
flower at NBRI.
 
Date 2015-10-29T11:31:56Z
2015-10-29T11:31:56Z
2012
 
Type Article
 
Identifier Plant Syst. Evol., 298(6): 1167-1175
2199-6881
http://link.springer.com/article/10.1007/s00606-012-0612-x
http://172.16.0.77:8080/jspui/handle/123456789/285
 
Language en_US
 
Publisher Springer