The Effects of Root Pruning on the Water Relations ofHelianthus annuusL

Autor:	George M. Briggs, Herman H. Wiebe
Rok vydání:	1982
Předmět:	Water potential Agronomy Physiology Liquid culture Helianthus annuus Plant Science Leaf water Aeration Biology Pruning Transpiration
Zdroj:	Journal of Experimental Botany. 33:966-976
ISSN:	1460-2431 0022-0957
DOI:	10.1093/jxb/33.5.966
Popis:	Four-week-old Helianthus annuus plants, grown in both soil and liquid culture, were root pruned at the point of root attachment to the stem. Transpiration, leaf water potential and leaf conductivity were monitored for several days after pruning. Pruning lowered transpiration and leaf conductivity in amounts proportional to the amount of pruning. In some experiments pruning caused a slight lowering of leaf water potential, while in others no pruning effect could be found. The effects of pruning varied depending upon culture conditions, with greater effects being found in soil and unaerated liquid culture than in aerated liquid culture. Soil water potential did not appear to have a strong influence on the magnitude of the pruning effect. The effects of root pruning are less than would be predicted by an Ohm's Law analysis of flow; possible reasons for this are discussed.
Databáze:	OpenAIRE
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