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Optical properties of Lactuca and Taraxacum seed and fruit coats: Their role as light filters
Author(s) -
Widell KarlOlof,
Vogelmann Thomas C.
Publication year - 1985
Publication title -
physiologia plantarum
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.351
H-Index - 146
eISSN - 1399-3054
pISSN - 0031-9317
DOI - 10.1111/j.1399-3054.1985.tb01209.x
Subject(s) - achene , lactuca , botany , germination , dandelion , biology , taraxacum officinale , receptacle , horticulture , coat , medicine , alternative medicine , pathology , traditional chinese medicine , paleontology
The optical properties of seed and fruit coats were examined from several varieties of light‐sensitive achenes. Taraxacum vulgare L. and Lactuca sativa L. cv. Grand Rapids achenes with dark fruit coats and L. sativa cvs Huvudsallat and Issallat with white fruit coats were examined. Transmission spectra varied among the different achenes: white fruit coats of Lactuca acted as neutral density filters between 450 and 780 nm, whereas Taraxacum transmitted 2–36% in this region. The ribbed fruit coat structure greatly affected transmission so that at different locations in the same coat, transmission varied between 20 to 80% at 660 and 730 nm. Fruit coats of Grand Rapids lettuce and Taraxacum transmitted more far‐red than red light with T 660 /T 730 ratios of 0.8 and 0.4, respectively. The relationship between the optical properties of fruit coats and light‐stimulated germination is discussed.