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Germination of Sicyos deppei (Cucurbitaceae) Seeds as Affected by Scarification and Light

Published online by Cambridge University Press:  12 June 2017

Alicia Brechu-Franco ,
Felipe Cruz-Garcia ,
Judith Marquez-Guzman  and
Guillermo Laguna-Hernandez
Alicia Brechu-Franco
Affiliation:
Universidad Nacional Autónoma de México. Apartado Postal No. 70–356. C. P. 04510. México, D. F.
Felipe Cruz-Garcia
Affiliation:
Universidad Nacional Autónoma de México. Apartado Postal No. 70–356. C. P. 04510. México, D. F.
Judith Marquez-Guzman
Affiliation:
Universidad Nacional Autónoma de México. Apartado Postal No. 70–356. C. P. 04510. México, D. F.
Guillermo Laguna-Hernandez
Affiliation:
Universidad Nacional Autónoma de México. Apartado Postal No. 70–356. C. P. 04510. México, D. F.
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Abstract

Sicyos deppei G. Don (Cucurbitaceae) is an annual weed that disperses dormant seeds. The influence of scarification and light on their germination was studied in the laboratory. Scarified seeds collected in 1987, 6, 7, 8, and 9 mo postharvest, gave high germination both in white light (89 to 100%) and darkness (64 to 96%), in comparison with nonscarified seeds which germinated 7 to 20% in both conditions. Scarified seeds collected in 1989, 3 mo postharvest, germinated higher (52 to 69%) than nonscarified seeds (0 to 5%). Exposure to light did not break dormancy of nonscarified seeds. The reversal of dormancy by scarification describes them as hard seeds. Scarified seeds, 3 mo postharvest, were light indifferent, germinating even in the usually inhibitory condition of far-red light. However, a low proportion of scarified seeds, 6 and 7 mo postharvest, presented a positive photoblastic response and germinated 23 and 36%, respectively.

Keywords

Dormancyseed coatimpermeabilityphotoblastism
Type
Weed Biology and Ecology
Information
Weed Science , Volume 40 , Issue 1 , March 1992 , pp. 54 - 56
Copyright
Copyright © 1992 by the Weed Science Society of America 

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