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Title: Effect of exogenous sucrose on the enzymes of starch degradation and sucrose metabolism in cowpea (Vigna unguiculata L.) seedlings
Authors: Kaur, Narinder
Kaur, Harpreet
Gupta, Anil K
Keywords: Cowpea seedlings
Vigna unguiculata L.
Abiotic stress
Sucrose
Mannitol
Germination
Growth
Amylase
Invertase
Sucrose synthase
Sucrose phosphate synthase
Issue Date: Oct-2005
Publisher: CSIR
IPC CodeC12N9/32; C08L3/00
Abstract: 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.
Page(s): 295-300
ISSN: 0301-1208
Source:IJBB Vol.42(5) [October 2005]

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