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Role of enzymes of sucrose-starch conversion in seed sink strength in mung bean

  • Published:
Biologia Plantarum

Abstract

Changes in the activities of sucrose synthase (SuSy), ADP-glucose pyrophosphorylase (AGPase), UDP-glucose pyrophosphorylase (UGPase), alkaline inorganic pyrophosphatase, 3-phosphoglycerate (3-PGA) phosphatase and amylases were monitored in relation to accumulation of starch in developing pods of mung bean (Vigna radiata L.). With the advancement in the seed development, the contents of starch rose with a concomitant fall in the branch of inflorescence and podwall after 10 d after flowering. The activity of UDPase in all the three pod tissues remained higher than the activity of AGPase showing it to be an important enzyme controlling carbon flux. The activity of alkaline inorganic pyrophosphatase in developing seed in contrast to 3-PGA phosphatase correlated with starch accumulation rate. Activity of β-amylase increased in all the pod tissues till maturity. It appears that the cooperative action of SuSy, UGPase and AGPase controls the efficient partitioning of sucrose into ADP glucose and thereby regulate the seed sink strength of the mung bean.

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Abbreviations

ADPGlc:

ADP-glucose

AGPase:

ADP-glucose pyrophosphorylase

BI:

branch of inflorescence

DAF:

days after flowering

G1P:

glucose-1-phosphate

3-PGA:

3-phosphoglycerate

Pi:

inorganic phosphate

PW:

podwall

SuSy:

sucrose synthase

UGPase:

UDP-glucose pyrophosphorylase

UDPGlc:

UDP-glucose

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Authors and Affiliations

  1. Department of Biochemistry and Chemistry, Punjab Agricultural University, Ludhiana, 141004, India

    J. Chopra, N. Kaur & A. K. Gupta

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  1. J. Chopra
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  2. N. Kaur
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  3. A. K. Gupta
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Correspondence to A. K. Gupta.

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Chopra, J., Kaur, N. & Gupta, A.K. Role of enzymes of sucrose-starch conversion in seed sink strength in mung bean. Biol Plant 49, 561–566 (2005). https://doi.org/10.1007/s10535-005-0050-5

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  • DOI: https://doi.org/10.1007/s10535-005-0050-5

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