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Interaction between cochleata and stipule-reduced mutations results in exstipulate hypertrophied leaves in Pisum sativum L.

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Title Interaction between cochleata and stipule-reduced mutations results in exstipulate hypertrophied leaves in Pisum sativum L.
 
Creator Kumar, Arvind
Sharma, Vishakha
Kumar, Sushil
 
Subject Biomass allocation
Compound leaf
Compound stipule
Phytomere regulation
Simple stipule
UNIFOLIATA
 
Description Accepted date: July 2013
In the wild type P. sativum, each of the adult plant stem nodes, bears a pair of sessile foliaceous stipules and a petiolated unipinnately compound leaf of 4 to 6 leaflets and 7-9 tendrils. The stipule-reduced (st) and cochleata (coch) single null mutants and coch st double null mutant differ fom the wild type in respectively having sessile stipules of much reduced size, petiolated simple and/or compound leaf-like stipules and no stipules. It is also known that coch leaves are somewhat bigger than st and wild type leaves. Here, pleiotropic phenotype of coch st double mutant was investigated. The morphologies of stipules and leaf were quantified in the field grown plants and microcultured shoots, latter in the presence and absence of gibberellic acid and N-1-naphthylphthalamic acid. The observations showed that as compared to the corresponding plants or shoots of COCH ST (WT) genotype, (a) coch st plants bore leaves in which all the organs were hypertrophied; (b) full complement of leaflets and 3-5 tendrils were formed on leaf; (c) the microcultured coch st shoots were taller despite lower number of nodes, and (d) they also produced leaves in which all the organs were bigger and the ratio of leaflets/tendrils was higher. It was concluded that in coch st double mutant (a) ST function is essential for stipule primordium differentiation, in the absence of COCH function and (b) absence of negative feedback loops between simple stipules and compound leaf for metabolite utilization allows hypertrophied growth in leaves.
Thanks are due to the Council of Scientific and
Industrial Research (CSIR) and Indian National
Science Academy for grant of scientist-ship schemes to SK, to the Director, NIPGR for facilities and
to CSIR and SKAIRED for postgraduate fellowship
to AK and VS respectively.
 
Date 2015-11-05T06:43:03Z
2015-11-05T06:43:03Z
2013
 
Type Article
 
Identifier Indian J. Exp. Biol., 51(7): 492-501
0019-5189
http://172.16.0.77:8080/jspui/handle/123456789/324
http://nopr.niscair.res.in/handle/123456789/19387
 
Language en_US
 
Publisher NISCAIR-CSIR, India