In plants and animal, role of RNAs (miRNAs are 21-24-nucleotide-long) as wherever post-transcriptional screen appearance of gene. Response to abiotic and biotic stressor, rising evidence focuses toward the essential position of miRNAs in plant. Zn is exceptionally harmless to plants and basic heavy metal. Some substantial metals are generally harmless, (for example,ruthenium, silver, and indium), or either fundamental supplements (normally iron, cobalt, and zinc), however in larger quantity or certain structures it is very well may be poisonous. Other important metals are deeply toxic, for example, cadmium, mercury, and lead. Like in rice was necessarily programming gene under Zn stress, when miR268 in rice was significantly induced. MiR268-Overexpressing in the transgenic plant leaves contained expanded high level of melanin dialdehyde and hydrogen peroxide, and high level of Zn in their seedlings gathered when contrasted with those in wild-type plants. MiR268 goes about as a negative controller of rice''s resilience to Zn stress in revealed outcomes however ecological variances role of miRNAs modulator. With prolonged understanding of the role of miRNAs in stress it has turned out to be exceedingly clear; the miRNA-interceded technique for gene regulation turned out to be increasingly practicable and reliable to increase plant tolerance under Zn stress.As well as agronomic factors during 2018 to check out zinc deficiency and toxicity impact on rice plant by using genetic factor contributing to tolerance field trial was performed in district Vehari. Three replications in Randomized Total Complete Block Design (RCBD) with various zinc dosages and genetic factors on rice crop were spread out. Rice seedling development under zinc not stun by over expression of miR268. The miR268-overexpressing transgenic plant leave contained high amount of melanin dialdehyde , hydrogen peroxide and their Zn level high in seedlings and collected when contrast with individual plant which are in nature of wild-type. These outcomes revealed to under zinc stress micro-RNA268 go about as a negative controller of rice tolerance under stress. At last, micro -RNA assumes a necessary function in plants tolerance to stress. To overwhelming lethality guided the overexpression of gene regulation of gene expression. While the executives framework came about increase development rate of rice and agronomic application while zinc applications was used in appropriate quantity.