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Plant wonders: How the dahlia became a herald of the fall in Latvia

Baroniņš has grown exemplars of a whopping height of two meters (dahlias can reach a height of six meters) with tubers about a meter long. There have been even taller plants in the indoor premises at the Botanic Garden of the University of Latvia, but the dahlia in question didn t flower, perhaps due to lack of light. Dahlias are by far the most colorful and most various flowers in the world, though there are no dahlias with exclusively blue flowers. These colorful additions to the garden require a lot of light and grow spindly in the shade. It s important to plant it on the lee side, as many dahlias have quite brittle stalks. They also like moisture, and have to be watered once a week if the weather is too dry.

Cre-controlled CRISPR: Conditional gene inactivation just got easier

 E-Mail IMAGE: Cre-Controlled CRISPR mutagenesis at work. Left: wild-type sibling with black pigment in melanocytes along the body and in the developing eye. Right: tissue-specific gene inactivation resulting in loss of pigmentation. view more  Credit: © Stefan Hans To discover the function of a gene researchers turn it off and observe the consequences. Often genes have multiple functions that differ depending on a tissue and age. Some genes are essential to growth and turning them off too early can have profound consequences that can make observing other functions impossible. To avoid it, researchers have been using conditional gene inactivation which allows turning a gene off only in a specific tissue or later in development, e.g., in adulthood.

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