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Germination Ecology of Milkweedvine (Morrenia odorata)

Published online by Cambridge University Press:  12 June 2017

Megh Singh  and
Nagi Reddy Achhireddy
Megh Singh
Affiliation:
Citrus Res. and Educ. Ctr., Univ. of Florida, IFAS, Lake Alfred, FL 33850
Nagi Reddy Achhireddy
Affiliation:
Citrus Res. and Educ. Ctr., Univ. of Florida, IFAS, Lake Alfred, FL 33850
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Abstract

The germination of milkweedvine (Morrenia odorata Lindl. ♯3 MONOD) seed at 20 or 25 C was unaffected by a 12-h photoperiod. The 12-h photoperiod, however, decreased germination by 50% at 15 C. No germination occurred at 35 C regardless of photoperiod. By alternating 35 C for 12 h with 20 C for 12 h, the germination percentage was 57%. Seedling growth was maximum at alternating temperatures of 30/20 C. Optimum pH for germination and seedling growth was 7 and germination did not occur at pH levels below 6. Seed germination declined steadily at osmotic stress below −0.12 MPa; no germination occurred at −0.5 MPa. Seedling growth was not influenced by osmotic stress down to −0.18 MPa. Germination percentages of seeds kept under aerated water and nonaerated water were similar, but the seedling growth was greater in aerated water. Seedling emergence was maximum from depths of 0.5 to 2.5 cm, but no seedling emerged from 0 or 10 cm. Planting depth was negatively correlated (r = −0.7) with shoot growth but positively correlated (r = +0.98) to root growth.

Keywords

Osmotic stresspHdepth of plantingMONOD
Type
Weed Biology and Ecology
Information
Weed Science , Volume 32 , Issue 6 , November 1984 , pp. 781 - 785
Copyright
Copyright © 1984 by the Weed Science Society of America 

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References

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