The influence of leaf area on the rooting physiology of leafy stem cuttings of Terminalia spinosa Engl. View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

1992-09

AUTHORS

A. C. Newton, P. N. Muthoka, J. McP. Dick

ABSTRACT

The effect of different leaf areas on the rooting of Terminalia spinosa Engl. cuttings in an non-mist propagation system in glasshouses at Edinburgh was investigated by trimming the leaves to 0, 7.5, 15 and 30 cm2 before cuttings were severed from stockplants. Cuttings were taken to a standard length of 5 cm from the lateral shoots of previously pruned stockplants grown in a tropicalised glasshouse. During the rooting period, photosynthetic rate, stomatal conductance, water potential and relative water content of the cuttings were assessed at regular intervals. It was found that (i) removal of the entire leaf area prevented rooting; (ii) cuttings with a 7.5 cm2, 15 cm2 and 30 cm2 leaf all achieved 80% rooting after 3 weeks; (iii) an increase in leaf area from 7.5 cm2 to 30 cm2 increased the rate of rooting and the length of the longest root after 2 weeks, but also increased the number of original leaves abscised after 6 weeks; and (iv) the greatest number of new leaves were produced by cuttings with 7.5 cm2 and 15 cm2 leaf area per cutting. All leafy cuttings actively photosynthesized during the propagation period, with a mean rate of 2 μmol CO2 m-2 s-1 with an irradiance of 100 μmol m-2 s-1. Cuttings with 30 cm2 leaf area had lower relative water contents, lower stomatal conductances and lower photosynthetic rates per unit leaf area than those with a 7.5 cm2 and 15 cm2 leaf. It was concluded that T. spinosa cuttings are easy to root, provided the cuttings have leaves to produce current assimilates. More... »

PAGES

210-215

Journal

TITLE

Trees

ISSUE

4

VOLUME

6

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/bf00224338

DOI

http://dx.doi.org/10.1007/bf00224338

DIMENSIONS

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