Effect of Plant Growth Regulators on Plant Nutrients

Abstract

Tomato, pea, and New Zealand spinach plants were treated with gibberellic acid, Cycocel, and Phosfon. The tomatoes, green peas, and spinach leaves were analyzed for proteins, soluble carbohydrates, starch, ascorbic acid, niacin, β‐carotene, and titratable acidity. Cycocel and Phosfon increased proteins in all products, starch in green peas and tomatoes, and ascorbic acid in spinach and tomatoes. Cycocel increased β‐carotene in spinach and tomatoes. Phosfon increased β‐carotene in tomatoes and soluble carbohydrates in green peas and tomatoes. Gibberellic acid increased proteins, soluble carbohydrates, and ascorbic acid in all the products and starch and β‐carotene in the tomato. Gibberellic acid caused extended growth, production of smaller tomatoes and beans, and more disease‐susceptible plants. Cycocel‐ and Phosfon‐treated plants were sturdier, greener, water and insect resistant, and produced larger tomatoes or beans or thicker spinach leaves.

Effect of Gibberellic Acid on Growth, Quality and Yield of Tomato (Lycopersicon esculentum Mill

“…Maximum TSS (⁰Brix) was found in T5 (4.95) and minimum TSS was found in T0 (3.80). Similar results were found by Gelmesa et al (2012) and Graham and Ballesteros (2006) in tomato.…”

Effect of Phosfon D on the Amino Acid Content and Protein Quality of Two Snap Bean Cultivars

“…This was due to the synthesis of nonprotein nitrogen componnents while in NemaSnap, greater synthesis of protein (amino acids) occurred. Graham and Ballesteros (1980) found a 43% increase of protein (% nitrogen X 6.25) in Phaseolus vulgaris cultivar Bountiful treated with Phosfon D. However, this reported protein value may also contain protein plus nonprotein nitrogen as we found in Eagle (Fig. 1).…”

“…Phosfon D applied as a foliar spray and as a soil drench to cowpea seedlings decreased the plant height, increased root length, and increased the yield (Jain and Yadava, 1981). Graham and Ballesteros (1980) demonstrated that soil-applied Phosfon D increased soluble carbohydrate, starch, and protein in green peas (snap beans).…”

Sources of Variation in the Nutrient Content of Agricultural Commodities From the Farm to the Consumer

“…These growth regulators provide the grower with some control of harvest maturity of crops and thus influence nutritional quality of harvested products. Preharvest application of gibberellins increased protein and ascorbic acid contents of spinach, green peas and tomatoes (Graham and Ballesteros 1980) and ascorbic acid of sweet cherries (Drake et al 1978).…”