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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.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	End-of-day far-red light quality and dose effects on elongation of tomato rootstock seedling hypocotyls./
作者:	Chia, Po-Lung.
面頁冊數:	52 p.
附註:	Source: Masters Abstracts International, Volume: 48-04, page: 2075.
Contained By:	Masters Abstracts International48-04.
標題:	Agriculture, Horticulture. -
電子資源:	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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