Vavilov was born into a merchant family in Moscow, the older brother of renowned physicist Sergey Ivanovich Vavilov. "
The son of a Moscow merchant who'd grown up in a poor rural village plagued by recurring crop failures and food rationing, Vavilov was obsessed from an early age with ending famine in both his native Russia and the world."

He graduated from the Moscow Agricultural Institute in 1910 with a dissertation on snails as pests.
 From 1911 to 1912, he worked at the Bureau for Applied Botany and at the Bureau of Mycology and Phytopathology.
From 1913 to 1914 he travelled in Europe and studied plant immunity, in collaboration with the British biologist William Bateson, who helped establish the science of genetics.

From 1917 to 1920, he was a professor at the Faculty of Agronomy, University of Saratov.
His son Oleg (with his first wife Yekaterina Sakharova) was born in 1918.

From 1924 to 1935 he was the director of the Lenin All-Union Academy of Agricultural Sciences at Leningrad.
Impressed with the work of Canadian phytopathologist Margaret Newton on wheat stem rust, in 1930 he attempted to hire her to work at the institute, offering a good salary and perks such as a camel caravan for her travel.
She declined, but visited the institute in 1933 for three months to train 50 students in her research.

Vavilov's first marriage ended in divorce in 1926, after which he married geneticist Elena Ivanovna Barulina, a specialist on lentils and assistant head of the institute's seed collection.
Their son Yuri was born in 1928.

While developing his theory on the centers of origin of cultivated plants, Vavilov organized a series of botanical-agronomic expeditions, and collected seeds from every corner of the globe.
In Leningrad, he created the world's largest collection of plant seeds.
 Vavilov also formulated the law of homologous series in variation.
He was a member of the USSR Central Executive Committee, President of All-Union Geographical Society and a recipient of the Lenin Prize.

In 1932, during the sixth congress, Vavilov proposed holding the seventh International Congress of Genetics in the USSR.
After some initial resistance by the organizing committee, in 1935 it agreed to hold the seventh congress in Moscow in 1937.
The Presidium of the USSR Academy of Sciences decided to support the idea and asked the Communist Party for its approval, which it gave on 31 July 1935.
Vavilov was elected chairman of the International Congress of Genetics.
However, on Nov 14 1936 the Politburo decided to cancel the congress.
The seventh International Congress of Genetics was postponed until 1939 and took place in Edinburgh instead.
The Politburo had decided to forbid Vavilov from travelling abroad and during the Congress's opening ceremony an empty chair was placed on the stage as a symbolic reminder of Vavilov's involuntary absence.

 
Vavilov encountered the young Trofim Lysenko and at the time encouraged him in his work.
At the time Lysenko was not the best at growing wheat and peas, but Vavilov continued to support him and his ideas.
It was not until later when he was under pressure from the Soviet State that Vavilov began to criticize the non-Mendelian concepts of Lysenko, who won the support of Joseph Stalin.
As a result, Vavilov was arrested on 6 August 1940, while on an expedition to Ukraine.
He was sentenced to death in July 1941.
In 1942 his sentence was commuted to twenty years imprisonment.
In 1943, he died in prison under unclear circumstances, but obviously in connection with the harsh prison conditions.
The prison's medical documentation indicates that he had been admitted into the prison hospital a few days prior to his death and mention the diagnoses of lung inflammation, dystrophy and edema as well as general weakness as a complaint, but as for the immediate cause of death, the death certificate only mentions 'decline of cardiac activity'.
Some authors assert that the actual cause of death was starvation.

The Leningrad seedbank was diligently preserved and protected through the 28-month long Siege of Leningrad.
While
Vavilov was born into a merchant family in Moscow, the older brother of renowned physicist Sergey Ivanovich Vavilov. "The son of a Moscow merchant who'd grown up in a poor rural village plagued by recurring crop failures and food rationing, Vavilov was obsessed from an early age with ending famine in both his native Russia and the world." 
He graduated from the Moscow Agricultural Institute in 1910 with a dissertation on snails as pests.  From 1911 to 1912, he worked at the Bureau for Applied Botany and at the Bureau of Mycology and Phytopathology. From 1913 to 1914 he travelled in Europe and studied plant immunity, in collaboration with the British biologist William Bateson, who helped establish the science of genetics.
From 1917 to 1920, he was a professor at the Faculty of Agronomy, University of Saratov. His son Oleg (with his first wife Yekaterina Sakharova) was born in 1918. 
From 1924 to 1935 he was the director of the Lenin All-Union Academy of Agricultural Sciences at Leningrad. Impressed with the work of Canadian phytopathologist Margaret Newton on wheat stem rust, in 1930 he attempted to hire her to work at the institute, offering a good salary and perks such as a camel caravan for her travel. She declined, but visited the institute in 1933 for three months to train 50 students in her research.
Vavilov's first marriage ended in divorce in 1926, after which he married geneticist Elena Ivanovna Barulina, a specialist on lentils and assistant head of the institute's seed collection. Their son Yuri was born in 1928.
While developing his theory on the centers of origin of cultivated plants, Vavilov organized a series of botanical-agronomic expeditions, and collected seeds from every corner of the globe. In Leningrad, he created the world's largest collection of plant seeds.  Vavilov also formulated the law of homologous series in variation. He was a member of the USSR Central Executive Committee, President of All-Union Geographical Society and a recipient of the Lenin Prize.
In 1932, during the sixth congress, Vavilov proposed holding the seventh International Congress of Genetics in the USSR. After some initial resistance by the organizing committee, in 1935 it agreed to hold the seventh congress in Moscow in 1937. The Presidium of the USSR Academy of Sciences decided to support the idea and asked the Communist Party for its approval, which it gave on 31 July 1935. Vavilov was elected chairman of the International Congress of Genetics. However, on Nov 14 1936 the Politburo decided to cancel the congress. The seventh International Congress of Genetics was postponed until 1939 and took place in Edinburgh instead. The Politburo had decided to forbid Vavilov from travelling abroad and during the Congress's opening ceremony an empty chair was placed on the stage as a symbolic reminder of Vavilov's involuntary absence.
 
Vavilov encountered the young Trofim Lysenko and at the time encouraged him in his work. At the time Lysenko was not the best at growing wheat and peas, but Vavilov continued to support him and his ideas. It was not until later when he was under pressure from the Soviet State that Vavilov began to criticize the non-Mendelian concepts of Lysenko, who won the support of Joseph Stalin. As a result, Vavilov was arrested on 6 August 1940, while on an expedition to Ukraine. He was sentenced to death in July 1941. In 1942 his sentence was commuted to twenty years imprisonment. In 1943, he died in prison under unclear circumstances, but obviously in connection with the harsh prison conditions. The prison's medical documentation indicates that he had been admitted into the prison hospital a few days prior to his death and mention the diagnoses of lung inflammation, dystrophy and edema as well as general weakness as a complaint, but as for the immediate cause of death, the death certificate only mentions 'decline of cardiac activity'. Some authors assert that the actual cause of death was starvation. 
The Leningrad seedbank was diligently preserved and protected through the 28-month long Siege of Leningrad. While
Nikolai Vavilov