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Longevity of crenate broomrape (Orobanche crenata) seed under soil and laboratory conditions

Published online by Cambridge University Press:  12 June 2017

Francisca López-Granados  and
Luis García-Torres
Luis García-Torres
Affiliation:
Institute for Sustainable Agriculture, CSIC, Apdo. 4084, 14080-Córdoba, Spain
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Extract

The effect of storage conditions on longevity of crenate broomrape seed was determined and then used to predict and simulate new infestations. Newly harvested broomrape seed mixed with soil and placed in nylon mesh bags was buried in soil 8 and 23 cm deep or kept at room temperature in the laboratory for 6 yr. In the field, seed exhibited a seasonal pattern in germination, showing consistent and poor germination from September to January and for the rest of the year, respectively. The two burial depths tested showed no significant differences in seed germination or survival. Seed stored under laboratory conditions germinated throughout the year. The negative exponential model (% germination = A exp−-B-months of storage) described the time course of germination of crenate broomrape seed. Seed longevity decreased much quicker in the field than in the laboratory. For example, germination capacity decreased 66 and 95% and only 27 and 60% after 33 and 108 mo of soil burial or under laboratory conditions, respectively. According to these findings, the repeatedly reported infestations occurring in plots after many (up to 14) years of not growing broomrape-susceptible crops can not be attributed to the longevity of buried seed.

Keywords

Crenate broomrape, Orobanche crenata Forsk. ORACR.Parasitic weed, seedbank, population dynamic, seed viability, germination, ORACR
Type
Weed Biology and Ecology
Information
Weed Science , Volume 47 , Issue 2 , April 1999 , pp. 161 - 166
Copyright
Copyright © 1999 by the Weed Science Society of America 

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