Photoperiodic responses of maize

dc.contributor.author	Thomas, Robert
dc.contributor.department	Botany
dc.date	2018-08-23T00:12:10.000
dc.date.accessioned	2020-06-30T07:29:30Z
dc.date.available	2020-06-30T07:29:30Z
dc.date.copyright	Thu Jan 01 00:00:00 UTC 1948
dc.date.issued	1948
dc.description.abstract	<p>A number of collections of maize from Guatemala and other Central and South American countries have shown varying photoperiodic responses when grown on the longer summer days at Ames, Iowa. A few lines mature normally, most flower weakly in September or October, too late to mature, and a few have shown no flowering when grown outdoors in Iowa;Covering young corn plants in the field with light-tight boxes to shorten the days to 11 or 12 hours during June or July has hastened and increased flowering of all of the lines tested, even of early Iowa corns. The gain in one Guatemalan corn was 31 days in time of first pollen shed, and percentage of stalks shedding pollen was increased from 2 to 96 percent. Covering for four weeks starting four weeks after emergence was most successful of the treatments tried. When given a 4-week photoinduction period, two Guatemala corns were three or four weeks earlier in Iowa than they normally are at high altitudes and lower temperatures in Guatemala;Chemical analyses of carbohydrate and nitrogen fractions of corn plants receiving long- and short-day exposures showed no significant differences;Injections of 2,4-dichlorophenoxyacetic acid into young corn plants growing under long days did not hasten the formation of floral primordia.</p>
dc.format.mimetype	application/pdf
dc.identifier	archive/lib.dr.iastate.edu/rtd/13533/
dc.identifier.articleid	14532
dc.identifier.contextkey	6936679
dc.identifier.doi	https://doi.org/10.31274/rtd-180813-14894
dc.identifier.s3bucket	isulib-bepress-aws-west
dc.identifier.submissionpath	rtd/13533
dc.identifier.uri	https://dr.lib.iastate.edu/handle/20.500.12876/67022
dc.language.iso	en
dc.source.bitstream	archive/lib.dr.iastate.edu/rtd/13533/r_DP12489.pdf\|\|\|Fri Jan 14 19:55:05 UTC 2022
dc.subject.disciplines	Agricultural Science
dc.subject.disciplines	Agriculture
dc.subject.disciplines	Agronomy and Crop Sciences
dc.subject.disciplines	Plant Sciences
dc.subject.keywords	Corn
dc.subject.keywords	Plants--Effect of light on
dc.subject.keywords	Plant physiology
dc.subject.keywords	Botany
dc.title	Photoperiodic responses of maize
dc.type	article
dc.type.genre	dissertation
dspace.entity.type	Publication
thesis.degree.level	dissertation
thesis.degree.name	Doctor of Philosophy

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