Barclays says Indian exports under 'serious threat' from US tariffs

** Barclays flags accelerating downside risk to India's economic growth from steep U.S. tariffs

** Estimates 70% ($55 bln worth) of India's exports to U.S. under "serious threat"

** Says 50% tariff firmly places India at disadvantageous position vs emerging market peers

** Notes India's top U.S. exports such as electrical machinery and gems and jewellery face largest tariff hikes compared with the start of the year

** Says apparel, gems & jewellery, footwear, leather likely to see adverse impact given their labour-intensive nature as well as higher dependence on U.S. demand

** Adds prudent for India to explore alternative export destinations

** Nifty 50 .NSEI falls 0.25% day after additional 25% tariffs enforced