biologia plantarum

International journal on Plant Life established by Bohumil Němec in 1959

Biologia plantarum 49:561-566, 2005 | DOI: 10.1007/s10535-005-0050-5

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

J. Chopra1, N. Kaur1, A. K. Gupta1,*
1 Department of Biochemistry and Chemistry, Punjab Agricultural University, Ludhiana, India

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.

Keywords: alkaline inorganic pyrophosphatase; amylase; 3-PGA phosphatase; starch metabolism; sucrose synthase; Vigna radiata
Subjects: ADP-glucose pyrophosphorylase; amylases; flower; mung bean, seed sink strength; 3-phosphoglycerate phosphatase; pyrophosphatase; starch, frozen storage of mature buds, flower, seed development; sucrose-starch conversion; sucrose synthase; Vigna radiata

Received: February 15, 2004; Accepted: February 25, 2005; Published: December 1, 2005  Show citation

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Chopra, J., Kaur, N., & Gupta, A.K. (2005). Role of enzymes of sucrose-starch conversion in seed sink strength in mung bean. Biologia plantarum, 49(4), 561-566. doi: 10.1007/s10535-005-0050-5
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