/kloc-what caused the great famine in Ireland in the 0/9th century?

1In the mid-1940s, the potato harvest in Ireland failed.

From the great famine. Now American researchers use DNA (deoxyribonucleic acid)

Technology found the killer of famine-potato late blight from the dead leaves of potato.

Bacteria.

Joan Riteno, a plant pathologist at North Carolina State University, studied for two years.

In the past, when I visited the dry herbarium in Britain, I was allowed to obtain 150 years.

Specimens of potato leaves preserved during the famine years. She uses genetic testing techniques.

DNA fragments of pathogens contained in dried leaves of potato crops were isolated.

Line replication, and then determine the sequence of a short piece of DNA. Riteno filmed this sequence.

Compared with the DNA samples of pathogenic Phytophthora at present, it is confirmed that pathogenic Phytophthora

It was the chief culprit that led to the failure of potato crops in Ireland that year, which was the first time that scientists succeeded.

The DNA of plant pathogen was successfully copied from the specimen.