Nitrogen Mobilization in Pea Seedlings. II. Free Amino Acids

Free amino acids in walnut kernels and young seedlings.

We investigated the composition of free amino acids in walnut (Juglans regia L.) seeds (embryo and cotyledons). We also examined xylem transport of free amino acids in young seedlings grown in the absence of external nutrients. A relatively high concentration of free alanine was found in seed tissue, whereas a relatively high concentration of citrulline was detected in young seedlings. Citrulli...

Variations in sucrose,total free amino acids and nitrates of sugarbeets during the growing season under high nitrogen untritional conditions

Greening in Pea Seedlings

The effect of gibberellic acid (GA) on light-induced greening of etiolated pea plants (Pisum sativum [L.] cultivars Alaska and Progress) was characterized. Progress, a GA-deficient dwarf of Alaska, was found to accumulate chlorophyll and light harvesting chlorophyll protein associated with photosystem 11 (LHC-11) more rapidly than Alaska, Alaska treated with GA, or Progress treated with GA. A s...

Free Amino Acids in Roots of Infected Cotton Seedlings Resistant and Susceptible to Meloidogyne incognita.

Quantities of free amino acids in segments of cotton roots resistant and susceptible to Meloidogyne incognita were compared. Following infection, the root-knot susceptible cultivar, M8, had greater percentage increases of certain individual free amino acids than the resistant cultivar, Clevewilt, but the sum total of free amino acids was greatest in the resistant cultivar. More free amino acids...

Dissolved free amino acids, combined amino acids, and DNA as sources of carbon and nitrogen to marine bacteria

Utilization of naturally-occurring dissolved free and combined amino acids (DFAA and DCAA) and dissolved DNA (D-DNA) was studied in batch cultures of bacteria from 2 shallow marine environments, Santa Rosa Sound (SRS), Florida. USA, and Flax Pond (FP), Long Island, New York, USA. In addition to control experiments, cultures were enriched with various sources of C and N. In the SRS cultures, net...