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Effect of exogenous sucrose on the enzymes of starch degradation and sucrose metabolism in cowpea (Vigna unguiculata L.) seedlings

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Title Effect of exogenous sucrose on the enzymes of starch degradation and sucrose metabolism in cowpea (Vigna unguiculata L.) seedlings
 
Creator Kaur, Narinder
Kaur, Harpreet
Gupta, Anil K
 
Subject Cowpea seedlings
Vigna unguiculata L.
Abiotic stress
Sucrose
Mannitol
Germination
Growth
Amylase
Invertase
Sucrose synthase
Sucrose phosphate synthase
 
Description 295-300
Addition of exogenous sucrose and mannitol in the growth medium decreased the germination and growth of cowpea (Vigna unguiculata L. cv C-88) seedlings. The reduced seedling growth appeared to be due to the decreased acid invertase activity in growing parts of the seedlings. An exogenous supply of sucrose upregulated the sucrose phosphate synthase (SPS) activity in different parts of seedlings. Decreased amylase activity in cotyledons and the mobilization of starch from cotyledons to the growing axis was observed in the presence of exogenous sucrose and mannitol. High sucrose content observed in different tissues in the presence of exogenous sucrose and mannitol was possibly due to high SPS and low acid invertase activities and reduced conversion of sucrose to starch. It appears that exogenous sucrose acts mainly as an osmoticum, rather than a source of carbon for the growing seedlings.
 
Date 2009-03-30T08:46:28Z
2009-03-30T08:46:28Z
2005-10
 
Type Article
 
Identifier 0301-1208
http://hdl.handle.net/123456789/3537
 
Language en_US
 
Relation C12N9/32; C08L3/00
 
Publisher CSIR
 
Source IJBB Vol. 42(5) [October 2005]