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Reproductive biology in Poa annua L.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Reproductive biology in Poa annua L./
Author:	Ruemmele, Bridget Anne.
Description:	1 online resource (162 pages)
Notes:	Source: Dissertations Abstracts International, Volume: 52-01, Section: B.
Contained By:	Dissertations Abstracts International52-01B.
Subject:	Botany. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9019093click for full text (PQDT)
ISBN:	9798206768992

Reproductive biology in Poa annua L.
Ruemmele, Bridget Anne.

Reproductive biology in Poa annua L. - 1 online resource (162 pages)

Source: Dissertations Abstracts International, Volume: 52-01, Section: B.

Thesis (Ph.D.)--University of Minnesota, 1989.

Includes bibliographical references

Poa annua, often considered a weedy grass, comprises a major turf component on many golf courses in temperate regions. Potential for developing improved cultivars has been suggested by extensive variation, including stoloniferous and perennial growth habits, dark green and fine-textured leaves, good rooting ability, and tolerances to environmental stresses. Poa annua is usually reported as self compatible, with 2 to 15 percent outcrossing. To facilitate a breeding and selection program to improve this species for golf turf use, an analysis of reproductive biology of included germplasm was required. The objectives were to develop an acceptable method to isolate inflorescences used in analyses of reproductive biology of Poa annua and to determine selfing and outcrossing potentials in Poa annua. Biotypes from sites in Canada, Europe, and the United States were studied using observations of morphology, anthesis, pollen tube development, apomixis, and seed yield from self, sib, and cross pollinations. The desired isolation technique used detached culms in floral pics containing solutions of 19.53g sucrose and.195g 8 hydroxyquinoline citrate (8HQC) dissolved in 1 liter of distilled water. Solutions using only distilled water, lower sucrose concentrations, or lower or higher 8HQC concentrations produced less seed set in paired comparisons of excised culms. Environmental influences, leaf removal, and use of fructose or sucrose in pic solutions did not significantly affect seed production on excised culms. Seed production was also influenced by time elapsed between excision for isolation and anthesis, anthesis asynchrony between isolated culms, and number of open spikelets. Multiple regression analysis may be used to predict seed set on excised Poa annua culms using the three previous factors. Outcrossing in Poa annua was indicated by sterile anthers, anthesis progression within an inflorescence, and reduced seed production on selected biotypes isolated for anthesis. Apomixis was not indicated. Seed set patterns of several genotypes indicated variable reproductive biology, from no self incompatibility or incongruity to either or both self incompatibility and incongruity. Results suggested that genotype selection may affect breeding success depending on incongruity expressed among accessions. In addition, variability in seed set affects breeding options for producing advanced generations.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2023

Mode of access: World Wide Web

ISBN: 9798206768992Subjects--Topical Terms:

516217
Botany.
Index Terms--Genre/Form:

542853
Electronic books.

Reproductive biology in Poa annua L.
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100 1 $a Ruemmele, Bridget Anne. $3 3703359
245 1 0 $a Reproductive biology in Poa annua L.
264 0 $c 1989
300 $a 1 online resource (162 pages)
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500 $a Source: Dissertations Abstracts International, Volume: 52-01, Section: B.
500 $a Publisher info.: Dissertation/Thesis.
500 $a Advisor: Ascher, Peter D.;White, Donald B.
502 $a Thesis (Ph.D.)--University of Minnesota, 1989.
504 $a Includes bibliographical references
520 $a Poa annua, often considered a weedy grass, comprises a major turf component on many golf courses in temperate regions. Potential for developing improved cultivars has been suggested by extensive variation, including stoloniferous and perennial growth habits, dark green and fine-textured leaves, good rooting ability, and tolerances to environmental stresses. Poa annua is usually reported as self compatible, with 2 to 15 percent outcrossing. To facilitate a breeding and selection program to improve this species for golf turf use, an analysis of reproductive biology of included germplasm was required. The objectives were to develop an acceptable method to isolate inflorescences used in analyses of reproductive biology of Poa annua and to determine selfing and outcrossing potentials in Poa annua. Biotypes from sites in Canada, Europe, and the United States were studied using observations of morphology, anthesis, pollen tube development, apomixis, and seed yield from self, sib, and cross pollinations. The desired isolation technique used detached culms in floral pics containing solutions of 19.53g sucrose and.195g 8 hydroxyquinoline citrate (8HQC) dissolved in 1 liter of distilled water. Solutions using only distilled water, lower sucrose concentrations, or lower or higher 8HQC concentrations produced less seed set in paired comparisons of excised culms. Environmental influences, leaf removal, and use of fructose or sucrose in pic solutions did not significantly affect seed production on excised culms. Seed production was also influenced by time elapsed between excision for isolation and anthesis, anthesis asynchrony between isolated culms, and number of open spikelets. Multiple regression analysis may be used to predict seed set on excised Poa annua culms using the three previous factors. Outcrossing in Poa annua was indicated by sterile anthers, anthesis progression within an inflorescence, and reduced seed production on selected biotypes isolated for anthesis. Apomixis was not indicated. Seed set patterns of several genotypes indicated variable reproductive biology, from no self incompatibility or incongruity to either or both self incompatibility and incongruity. Results suggested that genotype selection may affect breeding success depending on incongruity expressed among accessions. In addition, variability in seed set affects breeding options for producing advanced generations.
533 $a Electronic reproduction. $b Ann Arbor, Mich. : $c ProQuest, $d 2023
538 $a Mode of access: World Wide Web
650 4 $a Botany. $3 516217
650 4 $a Genetics. $3 530508
655 7 $a Electronic books. $2 lcsh $3 542853
690 $a 0369
690 $a 0479
710 2 $a ProQuest Information and Learning Co. $3 783688
710 2 $a University of Minnesota. $3 676231
773 0 $t Dissertations Abstracts International $g 52-01B.
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9019093 $z click for full text (PQDT)