The natural plant hormones were first isolate | vedclass

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(D) The discovery of plant growth regulators involved several key findings:$1$. Auxins were first isolated from human urine by $F.W. Went$ and others.

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Human urine and rice seedlings

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(D) The discovery of plant growth regulators involved several key findings:$1$. Auxins were first isolated from human urine by $F.W. Went$ and others.$2$. Gibberellins were first discovered by $E. Kurosawa$ from the fungus $Gibberella$ $fujikuroi$ (which causes 'bakanae' disease in rice seedlings).$3$. Cytokinins were first isolated from autoclaved herring sperm $DNA$,and later from corn germ oil (zeatin).Therefore,the historical isolation of these natural plant hormones is primarily associated with human urine and rice seedlings (in the context of the discovery of gibberellins).

The natural plant hormones were first isolated from:

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