Light Delivered by Sucrose Molecules Controls Plant Root Growth
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07 Aug 2023 05:44:02 am.
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Todemonstrate that sucrose, produced through photosynthesis, was the decisivesignal transmitter, Kircher and Schopfer placed plants in a room with light butno carbon dioxide (CO2) in the air, rendering photosynthesisimpossible. The result is that no more lateral roots are formed. This resultwas confirmed in another experiment in which the two biologists treated leavesor roots with a sucrose solution in the dark. In both methods, lateral rootdevelopment was the same as in light-exposed control plants. "These resultsshow that sucrose production in leaves is necessary for lateral root formation.It confirms the hypothesis of sucrose as a signal transmitter for lightstimulation," says Kircher.
Inearlier studies, the researchers had shown that auxin, produced in roots fromthe amino acid tryptophan, drives the rate at which new lateral roots develop.Kircher and Schopfer now show how sucrose triggers this process. To do this,they kept the plants in a dark room for two days and performed variousexperiments to discover their effect on lateral root formation. Applyingtryptophan to the roots at the same time as treating the leaves with sucroseworked best. In contrast, if tryptophan was applied to leaves or roots withoutsucrose, it had little effect. "These observations confirm that auxinsynthesis can be triggered by sucrose produced through photosynthesis,"Kircher said.
Collectedby Lifeasible. Lifeasible offers targeted sugar determination services forcertain sugars, including lactose, sucrose, andlactulose. 1
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