Abstract
Artificial microRNAs (amiRNA) provide a new feature in the gene silencing era. Concomitantly, reducing the amount of lignin in fiber-yielding plants such as jute holds significant commercial and environmental potential, since this amount is inversely proportional to the quality of the fiber. The present study aimed at reducing the lignin content in jute, by introducing amiRNA based vectors for down-regulation of two monolignoid biosynthetic genes of jute, coumarate 3-hydroxylase (C3H) and ferulate 5-hydroxylase (F5H). The transgenic lines of F5H-amiRNA and C3H-amiRNA showed a reduced level of gene expression, which resulted in about 25% reduction in acid insoluble lignin content for whole stem and 12-15% reduction in fiber lignin as compared to the non-transgenic plants. The results indicate successful F5H-amiRNA and C3H-amiRNA transgenesis for lignin reduction in jute. This is likely to have far-reaching commercial implications and economic acceleration for jute producing countries.
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