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The impact of light and gravity on growth directions in a root system of Cucumis sativus L.

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Author(s): Piotr Otręba

Journal: Acta Societatis Botanicorum Poloniae
ISSN 0001-6977

Volume: 78;
Issue: 1;
Start page: 7;
Date: 2009;
Original page

Keywords: gravitropic setpoint angle | gravitropism | phototropism | lateral roots | Cucumis sativus

ABSTRACT
While each individual root responds to such environmental factors as light or gravity the question arises how these reactions subordinate to the whole root system, which is supposed to maintain its primary functions. Data presented here confirm that in cucumber the gravity and light modulate the growth direction of the lateral roots subunits of the system. Another important factor affecting behavior of lateral roots is an orientation of the main root. These facts all together suggest that the root system functions as an integrated entity, capable of adapting its architecture to changing environmental conditions. Its flexibility, based on unknown signaling network, guarantees optimal functioning of the system.
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