The vacuole development in root nodules of Medicago truncatula was analyzed by light and electron microscopy. Histochemistry of protease activity in root nodules was studied using fluorogenic substrates for proteolytic enzymes, 7-amino-4-methylcoumarin, CBZ-L-phenylalanyl-L-arginine amide, hydrochloride (AMC), and rhodamine 110, bis-(CBZ-L-phenylalanyl-L-arginine amide) dihydrochloride (RPA). Furthermore, the topology of acidification of the central vacuoles in infected and noninfected cells in root nodules of Medicago truncatula was analyzed with the fluorescent pH-sensitive acidotropic dye Neutral Red. It was shown that vacuoles were acidic, lytic organelles in noninfected cells and young infected cells of the nodule where they displayed protease activity. Mature vacuoles of infected cells had high pH and did not show any substantial protease activity.
Russian Journal of Plant Physiology – Springer Journals
Published: Jan 6, 2007
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