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University MicrOfilms International 300 N. Zeeb Road AnnArbor,MI48106 8508799 Thammasiri, Kanchit FLOWER PIGMENTS IN YELLOW DENDROBIUM SPECIES AND HYBRIDS University of Hawaii PH.D. 1984 University Microfilms International 300 N. Zeeb Road, Ann Arbor, MI48106 PLEASE NOTE: In all cases this material has been filmed in the best possible way from the available copy. Problems encountered with this document havebeen identified here with a check mark __..j_. 1. Glossy photographs or pages --..L..... 2. Colored illustration'), paper or print__ 3. Photographs with dark background V 4. Illustrations are poor copy __ 5. Pages with black marks, not original copy__ 6. Print shows through as there is text on both sides of page__ 7. Indistinct, broken or small print on several pages ~ 8. Print exceeds margin requirements __ 9. Tightly bound copy with print lost in spine__ 10. Computer printout pages with indistinct print __ 11. Page(s) lacking when material received, and not available from school or author. 12. Page(s) seem to be missing in numbering only as text follows. 13. Two pages numbered . Textfollows. 14. Curling and wrinkled pages __ 15. Other _ University Microfilms International FLOWER PIGMENTS IN YELLOW DENDROBIUM SPECIES AND HYBRIDS A DISSERTATION SUBMITTED TO THE GRADUATE DIVISION OF THE UNIVERSITY OF HAWAII IN PARTIAL FULFILLMENT OF THE REQUIREMENTS FOR THE DEGREE OF DOCTOR OF PllILOSOPHY IN HORTICULTURE DECEMBER 1984 By Kanchit Thammasiri Dissertation Committe: Haruyuki Kamemoto, Chairman Richard W. Hartmann Kent D. Kobayashi Charles L. Murdoch Chung-Shih Tang iii ABSTRACT Carotenoids and chlorophylls in yellow petals of Dendrobium species and hybrids were examined by high-performance liquid chromatography (HPLC). Six carotenoids, neoxanthin, violaxanthin, antheraxanthin, lutein, zeaxanthin, and s-carotene, and chlorophyll a and b were identified. Lutein, zeaxanthin, and 8-carotene were the major pigments responsible for yellow flower color in several dendrobiums. Color was affected by the numbers and concentrations of pigments. The degradation of flavonoids, carotenoids, and chlorophylls in the flowers at different stages of maturity within a raceme was examined for three progeuies, K528 (pale yellow), K637 (white-purple), and K650 (bright yellow). The amounts of carotenoids and chlorophylls in crosses K528 and K637 decreased rapidly after blooming, while cross K650 maintained a high carotenoid content in all stages of maturity. Flavonol content in all three crosses did not show any change over time. Carotenoid and chlorophyll changes in growth and development from the bud stage to flower maturity were determined qualitatively and quantitatively in crosses K528 and K637. All 6 carotenoids and 2 chlorophylls in both crosses declined continually from the bud stage to 2-4 weeks after blooming. iv The inheritance of yellow flower color in Dendrobium appears to be complex, since at least 6 carotenoids and chlorophyll a and b have been shown to co-exist. Degradation of yellow pi~ments is not uncommon, and polyploidy further complicates the analysis of color inheritance. Since both carotenoid and chlorophyll concentrations in hybrids often fall between those of the parents, it appears that yellow color is mostly quantitatively inherited although interactions with modifying genes can be significant. v TABLE OF CONTENTS PAGE ABSTRACT •••• .. .. .. ·. .... .. iii LIST OF TABLES • .. ... ·.... ... vii LIST OF FIGURES • . •• • .. .. .. ... I• INTRODUCTION . ••• .. 1. 11. REVIEW OF LITERATURE • . ... • I. •• • •• 3 2.1 Yellow flower pigments. ••••••••• •• 3 2.2 Biosynthesis of flower'pigments ••••• •• 6 2.2.1 Carotenoids ••• '. • • • • • • • • •• 6 2.2.2 Chlorophylls ••••••••••• •• 8 2.2.3 Flavonoids... ••••••••• •• q ~.3 Function of flower pigments. •••••• •• 12 2.4 Degradation of flower pigments. ••••••• 11 ~.5 Color inheritance. ••••••••••• •• 18 2.5.1 Flavonoids... ••••••••• •• 18 2.5.2 Carotenoids •••••••••••••• 20 2.6 Color inheritance in orchids. • • • • • • • • 22 III. MATERIALS AND METHODS •• · . .. ... 27 3.1 Carotenoid and chlorophyll identification in flowers of Dendrobium species and hybrids 27 3.1.1 Extraction of pigments. ••••• •• ~7 3.1.2 RPLC system •••••••••••••• 11 1.1.3 Identification of pigments. ••• •• 32 1.1.4 Quantitative determination. ••• •• 1~ 1.2 n~gradation of clower pigments in Dendrobium hybrids. •••••••••••••••• •• 34 3.2.1 Pigment changes at different stages of flowers in a single raceme •••• •• 35 3.2.2 Carotenoid and chlorophyll changes in growth and development of flowers • •• 35 3.3 Cytology and yellow flower color inheritance. 36 3.3.1 Cytology. • ••••••••••••• '36 1.3.2 Yellow flower color inheritance. • • • 36 IV. RESULTS AND DISCUSSION ••••••••..•• •• 4.1 'Carotenoid and chlorophyll identification in Elowers of Dendrobium species and hybrids •• 38 4.1.1 Discussion.. •••••••••• •• 63 4.2 Degradation of flower pigments in Dendrobium hybrids ••••••••••••••••••• 68 vi 4.2.1 Pigment changes at different stages of f.lowers in a single r a c e me , fiB 4.~.2 Carotenoid and chlorophyll ch~nges in growth and development of flowers •• 76 4.2.3 Discussion. ••••••••••• 7B 4.3 Cytology and yellow flower color inheritance. 82 4.3.1 Cytology. •••••••••••• 82 4.3.2 Yellow flower color inheritance. 82 4.3.1 Discussion.. •••••••••• qO APPENDIX • 95 LITERATURE CITED • 114 vii LIST OF TABLES TABLE PAGE 1 Petal color of Dendrobium species and hybrids used for carotenoid and chlorophyll determination in their petals. 28 2 Petal color of Dendrobium cultivars and selections used for carotenoid and chlorophyll determination in their petals. Specific extinction coeffIcients at A max of carotenoids and chlorophylls used for quantitative determination. 33 4 Petal color of Dendrobium plants used for yellow flower color inheritance. 5 Identification of carotenoids and chlorophylls from petals of the genus Dendrobium. 19 6 Quantitative distribution of carotenoids and chlorophylls in petals of Q. macrophyllum at two different time. 49 7 Quantitative distribution of carotenoids and chlorophylls in petals of some Dendrobium species • Ouantitative distrihution of carotenoIds and ch l 0 r 0 ph Y11 sIn pet a 1 S 0 f some 1) end rob ill'': hybrids • Ii 1 9 Percentage and total amounts of carotenoids and chlorophylls in relation to petal color of some yellowish-flowered Dendrobium species. 64 10 Absorbance of flower pigments in three Dendrobium crosses at different stages of Elo~ers in a single raceme • 11 Quantitative distrihution of carotenoids and chlorophylls at different stages of growth and development of flowers in two Dendrobium crosses • 77 12 Chromosome numbers in some Dendrobium accessIons. viii 13 Segregation of offspring of crosses which have ~. Jaquelyn Thomas 'Y166-1' as an ancestor • ~6 14 Quantitative distribution of carotenolds and chlorophylls in petal of some nendroblum crosses with their parents • 89 ix LIST OF FIGURES FIGURE PACiE 1 Absorption spectra of neoxanthin in me t h a noLye c e t on Lt r L'le (25:75 v/V) and with addItion of RCI. • •••• ... 40 2 Absorption spectra of violaxanthin in methanol/acetonitrile (25:75 V/V) and with addition of RCI ••••••••••• 41 3 Absorption spectra of a n t h e r a xa n t h Ln in methanol/acetonitrile (25:75 V/v) and with addition of RCI. •••• • •••• 4~ 4 Absorption spectra of lutein In methanol/acetonitr.ile (25:75 v/V) and with a d d l t Lo n of ReI. • •••• 41 'i Absorption spectra of zeaxanthin in methanol/acetonitrile (25:75 V/V) and with addItion of RCI. • ••••••• 44 Absorption spectrum of chlorophyll b in methanol/acetonitrile (25:75 V/V). 45 7 Absorption spctrum of chlorophyll a in methanol/acetonitrile (25:75 V/V) 46 8 Absorption spectra of B-carotene in methanol/acetonitrile (25:75 V/V) and with a d d Lt Lon of Hel. •••• • ••• 47 Q 1<' 1. f) '01~ r s 0 f ~. a g g r ~ g '-t t 11:n • QPLC chromato~ram of a total pigment extract of ~. aggregatum ••• '52 11 Flowers of n. helix ••••••••• 53 12 HPLC chromatogram of a total pigment extract of D. helix. ••• . .•.••.•• '54 13 Flowers of D. strehloceras • '55 14 HPLC chromato~ram of a total pigment extract of n.