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Effects of Temperature and Light Variations on Seed Germination in Sunflower (Helianthus) Species

Published online by Cambridge University Press:  12 June 2017

A. M. Olivieri  and
S. K. Jain
A. M. Olivieri
Affiliation:
Dep. of Agron. and Range Science, Univ. of California, Davis, CA 95616
S. K. Jain
Affiliation:
Dep. of Agron. and Range Science, Univ. of California, Davis, CA 95616
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Abstract

Some genetic and physiological aspects of seed germination of wild and weedy sunflowers were investigated in order to analyze their population differentiation in seed characteristics. Seed germination of six populations classified on the basis of morphology as Helianthus exilis Gray, H. exilis-bolanderi hybrids, and H. bolanderi Gray was studied under red light at 20 C. The average germination of the three groups respectively were 56, 63, and 42%. Germinability of individual plant progenies derived from populations of H. bolanderi and H. exilis was studied under red and far-red light combined with the pretreatments at two temperatures (10 and 20 C). Average germination per progeny reached a maximum of 59% with red light and 10 C in H. bolanderi. Far-red light promoted germination of H. bolanderi but was ineffective with H. exilis. The homogeneity of populations within each taxon and the fact that germinability differences among the H. bolanderi progenies were consistent over replications, suggest a genetic component of variation. However, progenies obtained by crossing selected individuals that germinated under certain light and temperature treatments, were not significantly correlated in germinability with that of their parents. Inheritance of germination characteristics appears to be complex and highly dependent on the environmental conditions.

Type
Research Article
Information
Weed Science , Volume 26 , Issue 3 , May 1978 , pp. 277 - 280
Copyright
Copyright © 1978 by the Weed Science Society of America 

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References

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