Fianna Fáil's Charlie McConalogue has been appointed as the new Minister for Agriculture, Food and the Marine.
The Donegal TD will succeed Dara Calleary, who resigned last month over his attendance at the Oireachtas golf society dinner in Galway.
The golf event in Clifden also led to the resignation of EU Commissioner for Trade Phil Hogan.
Mr McConalogue is the third person to take on the role since the Government came to power in June.
Barry Cowen was sacked in July following the controversy over a drink-driving ban he received four years ago.
James Browne will succeed Mr McConalogue as Minister of State at the Department of Justice.
The Taoiseach said Mr McConalogue will discharge his role with distinction, saying he had a broad knowledge of agricultural issues.
Mr Martin said he takes on the role at the time when agriculture and marine face many challenges, including Brexit and the negotiation of new Common Agricultural Policy deal.
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Mr McConalogue, who picked up his seal of office from President Michael D Higgins, has been familiar with agricultural issues, as he was Fianna Fáil's spokesman on the portfolio in the previous Dáil.
In June, he was elevated to the role of Minister for State at the Department of Justice following the formation of coalition Government.
Minister for Agriculture, Food and the Marine Charlie McConalogue receives his seal of office from President Michael D Higgins | https://t.co/5ruTZagV2c pic.twitter.com/oAzEzRYl62
— RTÉ News (@rtenews) September 2, 2020
He was born in October 1977 and is from Gleneely in Co Donegal.
From a farming background, he was educated at Carndonagh Community School before going on to study at UCD where he studied Economics, Politics and History.
Mr McConalogue became involved in politics in UCD.
After working in Fianna Fáil's headquarters for a number of years, as well as working abroad in Australia, he returned home to work on the family farm in Donegal.
In 2009, he ran for political office when he was elected to Donegal County Council. He was elected a TD for Donegal North East in 2011.
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The president of the Irish Farmers' Association Tim Cullinan congratulated Mr McConalogue on his appointment.
He said: "Given the upheaval in the department since the Government took up office in June, we expect Minister McConalogue to get to grips with his portfolio quickly."
Mr Cullinan said farmers were in "the frontline in terms of a damaging outcome" to the Brexit trade talks adding that the CAP Budget, and the new Climate Bill were "urgent and critical issues for the Government".
"This minister has a huge task as farmers are frustrated with what they perceive to be fundamental unfairness in the food chain.
"They are being asked to do more and more for less return, as processors and retailers maximise their profits at the expense of farmers," he said.
President of the Irish Creamery Milk Suppliers Association Pat McCormack welcomed the appointment and said "it would be difficult to overstate the number and importance of the challenges facing the incoming Minister".
"I’m afraid I don’t think there can be any kind of 'honeymoon period’ for Minister McConalogue.
"We’ve lost two months as it is and I would suggest that the very first priority has to be introducing a degree of stability and the restoration of some momentum to several of the policies that appear to have drifted in the absence of a minister."
Mr McCormack said that on issues such as Brexit, CAP Post 2020, Mercusor and Climate Change, "we need commitment, energy and direction and we need them all urgently".
Additional reporting David Murphy and Paul Cunningham
