Dissertations and Theses @ UNI
Availability
Open Access Thesis
Keywords
Tripsacum--Flowering;
Abstract
Development of sexually mixed inflorescences in wild-type Tripsacum dactyloides. Kaparthi, Rakhee 1996. A thesis submitted to the faculty of the University of Northern Iowa in partial fulfillment of the requirements for the degree of Master of Arts. The objective of this study was to determine whether Tripsacum dactyloides (eastern gamagrass) derives its sexually mixed inflorescence in accord with the common organogenic pattern shared by and most of the teosintes (Z. diploperennis, Z. perennis, Z. mexicana, Z. parviglumis) and maize (Z. mays). This study used scanning electron microscopy and light microscopy to investigate the ontogeny and histogenesis of early inflorescences and floral development of wild-type Tripsacum dactyloides. The organogenic pattern of inflorescence development was compared to inflorescence organogenesis in maize and the teosintes. Early organogenesis of Tripsacum dactyloides inflorescences that terminate both the primary axis (A1) and axes lateral (A2) to the primary axis was examined. Organogenesis along the inflorescence rachis proceeded acropetally and showed a dorsiventral morphology. Distichously produced bract primordia subtended axillary buds along the abaxial surface. The development of spikelet and floret primordia was similar to that described for maize and the teosintes. Wild-type inflorescences developed two ranks (four rows) of paired staminate spikelets with two florets each in the distal portion of the inflorescence. The proximal portion of the rachis developed two rows of single female spikelets with one floret. Gynoecial tissue aborted in both staminate florets. The single spikelet condition arose by arrest and abortion of the pedicellate spike let in the proximal portion of the rachis. This ontogenetic derivation of the single, sessile spikelet is similar to the pattern observed in the lateral A 2 teosinte inflorescence (Z. perennis, Z. mexicana, and Z. parviglumis). The derivation of the sexually mixed inflorescence observed in eastern gamagrass is similar to the perennial teosinte, Z. diploperennis. Developmental analysis indicates that genera Zea and Tripsacum share a common ontogenetic pattern
Year of Submission
1996
Degree Name
Master of Arts
Department
Department of Biology
First Advisor
Alan R. Orr
Second Advisor
Jean M. Gerrath
Third Advisor
Laura L. Jackson
Date Original
1996
Object Description
1 PDF file (68 leaves)
Copyright
©1996 Rakhee Kaparthi
Language
en
File Format
application/pdf
Recommended Citation
Kaparthi, Rakhee, "Development of Sexually Mixed Inflorescences in Wild-Type Tripsacum dactyloides" (1996). Dissertations and Theses @ UNI. 3121.
https://scholarworks.uni.edu/etd/3121
Comments
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