Seed Production and Apomictic Stability in Tetraploid Bahiagrass

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Material Information

Title:
Seed Production and Apomictic Stability in Tetraploid Bahiagrass
Physical Description:
1 online resource (136 p.)
Language:
english
Creator:
Rios, Esteban F
Publisher:
University of Florida
Place of Publication:
Gainesville, Fla.
Publication Date:

Thesis/Dissertation Information

Degree:
Master's ( M.S.)
Degree Grantor:
University of Florida
Degree Disciplines:
Agronomy
Committee Chair:
BLOUNT,ANN RACHEL SOFFES
Committee Co-Chair:
KENWORTHY,KEVIN E
Committee Members:
HARMON,PHIL F
QUESENBERRY,KENNETH H
MACKOWIAK,CHERYL

Subjects

Subjects / Keywords:
apomixis -- bahiagrass -- ergot -- seed
Agronomy -- Dissertations, Academic -- UF
Genre:
Agronomy thesis, M.S.
bibliography   ( marcgt )
theses   ( marcgt )
government publication (state, provincial, terriorial, dependent)   ( marcgt )
born-digital   ( sobekcm )
Electronic Thesis or Dissertation

Notes

Abstract:
Normal 0 false false false EN-US JA X-NONE Bahiagrass (Paspalumnotatum Flügge) is a warm-season perennial grass used for forage and turfapplications in Florida. Diploid and tetraploid bahiagrass races are primarilyestablished from seed. Diploid races reproduce sexually, while tetraploids areapomictic (obligate or facultative). Low seed yield is often associated withapomictic races. Additionally ergot (Clavicepspaspali Stevens & Hall) infections reduce seed quality in bahiagrass, primarilyin tetraploid genotypes.Advanced tetraploid forageand turf-type bahiagrass were characterized for their mode of reproduction by cytoembryologicalobservations at anthesis. The genotypes classified as facultative apomicticshowed a seasonal expression of apomixis. Flow cytometry analysis in seedsrevealed that for some genotypes the sexual pathway was less efficient at seed development.The seed yield of 5 dwarf genotypes and 2 forage-type hybrids was similar toArgentine; however, Argentine and both hybrids showed higher seed germination. Defoliationin May followed by an application of 60 kg N ha-1 produced higherseed yields, although delaying defoliation until June produced higher seedquality. Argentine and both hybrids showed higher susceptibility to ergot, andsome of the dwarf genotypes did not show symptoms under field conditions. Oneapplication of fungicides at anthesis was not sufficient in controlling ergotin bahiagrass. /* Style Definitions */ table.MsoNormalTable{mso-style-name:"Table Normal";mso-tstyle-rowband-size:0;mso-tstyle-colband-size:0;mso-style-noshow:yes;mso-style-priority:99;mso-style-parent:"";mso-padding-alt:0in 5.4pt 0in 5.4pt;mso-para-margin:0in;mso-para-margin-bottom:.0001pt;mso-pagination:widow-orphan;font-size:10.0pt;font-family:"Arial","sans-serif";mso-bidi-font-family:"Times New Roman";}
General Note:
In the series University of Florida Digital Collections.
General Note:
Includes vita.
Bibliography:
Includes bibliographical references.
Source of Description:
Description based on online resource; title from PDF title page.
Source of Description:
This bibliographic record is available under the Creative Commons CC0 public domain dedication. The University of Florida Libraries, as creator of this bibliographic record, has waived all rights to it worldwide under copyright law, including all related and neighboring rights, to the extent allowed by law.
Statement of Responsibility:
by Esteban F Rios.
Thesis:
Thesis (M.S.)--University of Florida, 2013.
Local:
Adviser: BLOUNT,ANN RACHEL SOFFES.
Local:
Co-adviser: KENWORTHY,KEVIN E.
Electronic Access:
RESTRICTED TO UF STUDENTS, STAFF, FACULTY, AND ON-CAMPUS USE UNTIL 2014-12-31

Record Information

Source Institution:
UFRGP
Rights Management:
Applicable rights reserved.
Classification:
lcc - LD1780 2013
System ID:
UFE0046354:00001