Uses of Plant Growth Regulators and Biofertilizers in Fruit Crops: A Review

Plant growth regulators are extremely important natural hormones which control the growth and the physiological factors within the plant. They are naturally occurring as well as synthetic. PGRs like Auxins, ethylene, cytokinins and gibberellins are the growth inhibitors and growth retardants. The foliar application of plant growth regulators helped in increasing the quality of the fruit crops. Auxin is required for fruit retention in sweet cherry, litchi, grapevine, snake fruit and tomato. Most commonly used auxins are IBA, NAA, IAA, 2,4D etc. IBA at the concentration of 4000 ppm is the best plant growth regulator for rooting in cuttings. Gibberellins (GA) are diterpene plant hormones that influence various aspects of growth and development through complex biosynthetic processes. Application of GA with combination of Zinc and pruning showed better performance in fruit weight, ascorbic acid, and reduction in pre-harvest fruit drop. Repeated applications of brassinosteroid have a long-lasting effect on strawberry cv. Winter Dawn physiological growth. Triacontanol (TRIA), natural plant growth hormone in fruit crops. It regulates a variety of physiological processes in plants. Salicylic acid (SA) is a plant hormone best recognized for modulating host responses in response to pathogen infection.SA treatments boosted crop productivity and fruit quality criteria such as firmness, aril color, and individual sugar and organic acid concentrations at harvest. It is revealed by many studies that the application of biofertilizer play an essential role for increasing the sustainability of the soil and also enhance the organic matter content, aeration, fertility, availability of micro and macronutrients with in the soil which are the essential things for the better survival of the plant and results into the good quality and higher yield from the plant. The present review encompasses the use and the effect of different PGR’s and biofertilizer on the fruit crops.