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 Physioljournal_title
Journal of plant physiologyauthors
Borek S,Nuc Kdoi
10.1016/j.jplph.2011.05.016subject
Has Abstractpub_date
2011-10-15 00:00:00pages
1795-803issue
15eissn
0176-1617issn
1618-1328pii
S0176-1617(11)00257-4journal_volume
168pub_type
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