Physiology of dwarfism in fruit crops: A review

Dwarfing is an alternation in the normal growth pattern. Fruit growth, development, and quality are all influenced by dwarf fruit trees. Pruning, thinning, spraying, and harvesting are all simple tasks that can result in high-quality fruit being produced at a lesser cost. In-vitro procedures, genetic engineering, thigmomorphogenesis, and growth retardants, among other things, can be utilised to generate dwarf trees. Dwarfing rootstock is an essential source of germplasm for high-density cultivations that require mechanised harvesting. Several variables, including water, nutrients, and especially hormones, which travel through the graft union to impact scion growth, may be responsible for rootstock-induced size control. Plants’ biological reactions are affected by growth retardants. By reducing auxin production sites, pruning and training procedures reduce tree vigour. By restricting the passage of carbohydrates and auxins to the roots, ringing and girdling control the tree’s size. Inducing viral infection with viroid of moderate or mild strains can also cause dwarfing. Recently, genetic engineering has expanded the gene pool that can be managed to cause dwarfism and maximise horticultural crop benefits. Dwarfing is now regarded as desirable trait in modern orchards, where genetic dwarfs may be selected and propagated.