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End-of-day far-red light quality and...

Chia, Po-Lung.

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End-of-day far-red light quality and dose effects on elongation of tomato rootstock seedling hypocotyls.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	End-of-day far-red light quality and dose effects on elongation of tomato rootstock seedling hypocotyls./
Author:	Chia, Po-Lung.
Description:	52 p.
Notes:	Source: Masters Abstracts International, Volume: 48-04, page: 2075.
Contained By:	Masters Abstracts International48-04.
Subject:	Agriculture, Horticulture. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=1473919
ISBN:	9781109606058

End-of-day far-red light quality and dose effects on elongation of tomato rootstock seedling hypocotyls.
Chia, Po-Lung.

End-of-day far-red light quality and dose effects on elongation of tomato rootstock seedling hypocotyls. - 52 p.

Source: Masters Abstracts International, Volume: 48-04, page: 2075.

Thesis (M.S.)--The University of Arizona, 2009.

Methyl bromide fumigation, a common method used to combat soil borne pathogens in commercial tomato cultivation, was to be limited by the Montreal Protocol due to concerns of ozone depletion. Alternative methods to protect tomatoes against diseases include grafting. However, short grafted transplants may expose the scion to the soil. To avoid scion exposure, hypocotyl elongation of two tomato rootstocks 'Maxifort' and 'Aloha' via end-of-day far-red (EOD-FR) was examined in terms of light quality (red to far-red ratio, or R/FR) and dose (product of far-red intensity and duration). In EOD-FR light quality experiments, 'Aloha' seedlings were exposed to unfiltered and filtered incandescent light with an R/FR of 0.5 and 0.05 respectively. The resulting hypocotyl elongation was higher in filtered light than either the unfiltered light or the untreated control. Hypocotyl elongation response to EOD-FR dose in 'Aloha' and 'Maxifort' was affected by both far-red intensity and treatment duration. A saturating response was also found within a far-red dose between 0--8 mmol&dot;m -2&dot;d-1 and modeled using non-linear regression with a three parameter Michaelis-Menten equation to estimate the far-red dose required to obtain near-maximum hypocotyl elongation for 'Aloha' and 'Maxifort'. The far-red dose required was affected by cultivar and experimental period. None of the EOD-FR treatments affected plant mass or stem diameter. To conclude, for maximum hypocotyl elongation using EOD-FR, the lower R/FR would increase the effectiveness of the treatment. The far-red dose should preferably be at 4--8 mmol&dot;m-2&dot;d -1.

ISBN: 9781109606058Subjects--Topical Terms:

1017832
Agriculture, Horticulture.

End-of-day far-red light quality and dose effects on elongation of tomato rootstock seedling hypocotyls.
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008 130515s2009 ||||||||||||||||| ||eng d
020 $a 9781109606058
035 $a (UMI)AAI1473919
035 $a AAI1473919
040 $a UMI $c UMI
100 1 $a Chia, Po-Lung. $3 1677053
245 1 0 $a End-of-day far-red light quality and dose effects on elongation of tomato rootstock seedling hypocotyls.
300 $a 52 p.
500 $a Source: Masters Abstracts International, Volume: 48-04, page: 2075.
500 $a Adviser: Chieri Kubota.
502 $a Thesis (M.S.)--The University of Arizona, 2009.
520 $a Methyl bromide fumigation, a common method used to combat soil borne pathogens in commercial tomato cultivation, was to be limited by the Montreal Protocol due to concerns of ozone depletion. Alternative methods to protect tomatoes against diseases include grafting. However, short grafted transplants may expose the scion to the soil. To avoid scion exposure, hypocotyl elongation of two tomato rootstocks 'Maxifort' and 'Aloha' via end-of-day far-red (EOD-FR) was examined in terms of light quality (red to far-red ratio, or R/FR) and dose (product of far-red intensity and duration). In EOD-FR light quality experiments, 'Aloha' seedlings were exposed to unfiltered and filtered incandescent light with an R/FR of 0.5 and 0.05 respectively. The resulting hypocotyl elongation was higher in filtered light than either the unfiltered light or the untreated control. Hypocotyl elongation response to EOD-FR dose in 'Aloha' and 'Maxifort' was affected by both far-red intensity and treatment duration. A saturating response was also found within a far-red dose between 0--8 mmol&dot;m -2&dot;d-1 and modeled using non-linear regression with a three parameter Michaelis-Menten equation to estimate the far-red dose required to obtain near-maximum hypocotyl elongation for 'Aloha' and 'Maxifort'. The far-red dose required was affected by cultivar and experimental period. None of the EOD-FR treatments affected plant mass or stem diameter. To conclude, for maximum hypocotyl elongation using EOD-FR, the lower R/FR would increase the effectiveness of the treatment. The far-red dose should preferably be at 4--8 mmol&dot;m-2&dot;d -1.
590 $a School code: 0009.
650 4 $a Agriculture, Horticulture. $3 1017832
650 4 $a Biology, Plant Physiology. $3 1017865
690 $a 0471
690 $a 0817
710 2 $a The University of Arizona. $b Plant Science. $3 1677054
773 0 $t Masters Abstracts International $g 48-04.
790 1 0 $a Kubota, Chieri, $e advisor
790 1 0 $a Ray, Dennis T. $e committee member
790 1 0 $a Wang, Guangyao $e committee member
790 $a 0009
791 $a M.S.
792 $a 2009
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=1473919