Effect of partial root excision on shoot water relations.
Removing 4 out of 5 serminal roots from 7-day-old wheat seedlings arrested leaf elongation for 1.5 h. This effect can be explained by an initial decrease in foliar water content resulting from the smaller root surface area available for water uptake. Subsequently, leaf hydration increased with time and came to equal that of intact plants within 2 h. The rehydration was seemingly effected by an increasing conductivity of the one remaining root axis, since transpiration of the partially de-rooted plants did not fall below that of controls. With time, leaf elongation resumed, but at a slower rate than in intact plants. This slower growth may be attributed to a decrease in leaf extensibility since this was found to be reduced when measured by a counterweight technique involving linear displacement transducers. Loss of extensibility was associated with decreased IAA concentration in the leaf elongation zone.
Institute of Biology of Russian Academy of Sciences, Ufa Research Center, pr. Octyabrya, 69, Ufa 450054, Russia.
Lidia B
LB
Vysotskaya
Tatiana N
TN
Arkhipova
Leila N
LN
Timergalina
Stanislav Yu
SY
Veselov
Alexander V
AV
Dedov
Guzel R
GR
Kudoyarova
D007210:Indoleacetic Acids / Q000378:metabolism; D018515:Plant Leaves / Q000254:growth & development / Q000378:metabolism; D018517:Plant Roots / Q000254:growth & development / Q000378:metabolism; D018520:Plant Shoots / Q000254:growth & development / Q000378:metabolism; D014908:Triticum / Q000254:growth & development* / Q000378:metabolism*; D014867:Water / Q000378:metabolism
D007210:Indoleacetic Acids; D014867:Water; C030737:indoleacetic acid