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Annals of Botany 61: 347-354, 1988
© 1988 Annals of Botany Company

RESEARCH-ARTICLE

Effects of Plant Growth Regulators and Nutrient Supply on Tiller Bud Outgrowth in Barley (Hordeum distichum L.)

E. J. WOODWARD* and C. MARSHALL

School of Plant Biology, University College of North Wales Bangor, Gwynedd LL57 2UW, UK

* Present address: North of Scotland College of Agriculture, 581 King Street, Aberdeen AB9 IUD, UK.

Accepted: 10 November 1987   

Seedlings of spring barley were raised in 100 and 20% nutrient solution and treated with a foliar application of Terpal, Cerone, TIBA, GA3 or BAP. The growth of individual tiller buds and tillers, the main shoot and the root system was recorded over the following 15 d. Terpal and Cerone stimulated tiller bud elongation within 5 d at both nutrient levels and after 15 d the number of emerged tillers was increased at the higher nutrient level. Terpal characteristically promoted the growth of secondary tiller buds whereas Cerone promoted the emergence of the coleoptile tiller; both these PGRs also retarded the development of the main shoot. TIBA increased the number of elongating tiller buds but this did not result in greater tillering. GA3 reduced the number of elongating tiller buds and restricted their growth, especially in the high nutrient regime; this was accompanied by an increase in main shoot elongation. The growth and development of tiller buds was reduced by BAP and the number of emerged tillers was reduced at 15 d in both nutrient levels; main shoot dry weight and root elongation were also reduced. The results are considered in relation to the overall influence of hormonal factors and mineral supply on tiller bud outgrowth.

Hordeum distichum, spring barley, tiller bud outgrowth, plant growth regulators, Terpal, Cerone, GA3, BAP, nutrient supply, apical dominance, TIBA


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