Contractile growth of the hypocotyl of Lotononis bainesii seedlings in relation to some environmental factors.

Published online
07 Nov 1992
Content type
Journal article
Journal title
Journal of Applied Ecology

Fujita, M. & Humphreys, L. R.

Publication language
Australia & Queensland


In a greenhouse experiment L. bainesii seeds were sown at 0, 10, 20 or 30 mm depth, covered with Digitaria decumbens straw (20 mm length) at 0, 70, 140 or 210 g/m2 and grown under shades giving 24, 47, 77 or 100% light transmission. Light negatively influenced the extension of the hypocotyl aboveground level and positively increased the contractile growth of the hypocotyl to produce a buried crown. Emergence from 10 and 20 mm depth and the absence of litter also favoured the development of a buried crown. In a field experiment at Queensland University's Mt. Cotton Research Station sheep were withdrawn from a D. decumbens dominated pasture containing L. bainesii. Five L. bainesii seedlings/quadrat (0.4 m × 0.4 m) were tagged and the height of the hypocotyl was measured as was the light received by the seedlings. The observations supported the findings from the greenhouse experiment. A buried crown did not develop in the absence of grazing. It was suggested that the maintenance of grazing pressure following seedling regeneration would promote L. bainesii density in mixed pastures.

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