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Fluctuating Temperatures Break Seed Dormancy of Catclaw Mimosa (Mimosa pigra)

Published online by Cambridge University Press:  12 June 2017

Stephen P. Dillon  and
Frank Forcella
Stephen P. Dillon
Affiliation:
Div. of Plant Ind., CSIRO, G.P.O. Box 1600, Canberra, A.C.T. 2601, Australia
Frank Forcella
Affiliation:
Div. of Plant Ind., CSIRO, G.P.O. Box 1600, Canberra, A.C.T. 2601, Australia
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Abstract

Because environmental factors facilitating the breaking of dormancy of seed of catclaw mimosa (Mimosa pigra L. ♯ MIMPI) under field conditions were unknown, the effect of constant temperatures (2 to 44 C) on germination of scarified and unscarified seeds, and the effect of diurnally fluctuating temperatures on unscarified seeds were examined. Temperatures fluctuated diurnally by 10 and 20 C in these latter experiments. Germination was less than 10% at all constant temperatures except 44 C, which had 40% germination. Scarification increased germination to 100% at constant temperatures greater than 12 C. Germination of unscarified seed was significantly lower (0 to 23%) when day/night temperature ranges fluctuated by 10 C than when they fluctuated by 20 C. Optimum temperature for germination was 40/20 C, where 93% germination occurred within 4 days.

Keywords

BiogeographygerminationGiant Sensitive Planttropical weedMIMPI
Type
Weed Biology and Ecology
Information
Weed Science , Volume 33 , Issue 2 , March 1985 , pp. 196 - 198
Copyright
Copyright © 1985 by the Weed Science Society of America 

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References

Literature Cited

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