Sucrose controls storage lipid breakdown on gene expression level in germinating yellow lupine (Lupinus luteus L.) seeds.

Abstract:

:This study revealed that cytosolic aconitase (ACO, EC 4.2.1.3) and isocitrate lyase (ICL, EC 4.1.3.1, marker of the glyoxylate cycle) are active in germinating protein seeds of yellow lupine. The glyoxylate cycle seems to function not only in the storage tissues of food-storage organs, but also in embryonic tissue of growing embryo axes. Sucrose (60mM) added to the medium of in vitro culture of embryo axes and cotyledons decreased activity of lipase (LIP, EC 3.1.1.3) and activity of glutamate dehydrogenase (NADH-GDH, EC 1.4.1.2). The opposite effect was caused by sucrose on activity of cytosolic ACO, ICL as well as NADP(+)-dependent (EC 1.1.1.42) and NAD(+)-dependent (EC 1.1.1.41) isocitrate dehydrogenase (NADP-IDH and NAD-IDH, respectively); activity of these enzymes was clearly stimulated by sucrose. Changes in the activity of LIP, ACO, NADP-IDH, and NAD-IDH caused by sucrose were based on modifications in gene expression because corresponding changes in the enzyme activities and in the mRNA levels were observed. The significance of cytosolic ACO and NADP-IDH in carbon flow from storage lipid to amino acids, as well as the peculiar features of storage lipid breakdown during germination of lupine seeds are discussed.

journal_name

J Plant Physiol

authors

Borek S,Nuc K

doi

10.1016/j.jplph.2011.05.016

subject

Has Abstract

pub_date

2011-10-15 00:00:00

pages

1795-803

issue

15

eissn

0176-1617

issn

1618-1328

pii

S0176-1617(11)00257-4

journal_volume

168

pub_type

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