東華大學圖書館 |

Language: English

Help

回圖書館首頁

手機版館藏查詢

Back

Switch To: Labeled | MARC Mode | ISBD

The effect of light and temperature ...

Justen, Veronica Lea.

Linked to FindBook

Google Book

Amazon

博客來

The effect of light and temperature on glucosinolate concentration in turnip (Brassica rapa).

Record Type:	Language materials, printed : Monograph/item
Title/Author:	The effect of light and temperature on glucosinolate concentration in turnip (Brassica rapa)./
Author:	Justen, Veronica Lea.
Description:	89 p.
Notes:	Source: Dissertation Abstracts International, Volume: 71-10, Section: B, page: 5861.
Contained By:	Dissertation Abstracts International71-10B.
Subject:	Agriculture, Horticulture. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3422562
ISBN:	9781124218830

The effect of light and temperature on glucosinolate concentration in turnip (Brassica rapa).
Justen, Veronica Lea.

The effect of light and temperature on glucosinolate concentration in turnip (Brassica rapa). - 89 p.

Source: Dissertation Abstracts International, Volume: 71-10, Section: B, page: 5861.

Thesis (Ph.D.)--University of Minnesota, 2010.

Glucosinolates (GSLs) are thioglucosides produced by turnip ( Brassica rapa subsp. rapa) and other cruciferous vegetables with important properties for plant defense and human health, particularly cancer prevention. We compared yield and GSL concentrations in the roots and shoots of turnip cultivars grown using plastic colored mulch and photoselective netting treatments in both a May and August planting. Turnip yield and GSL concentrations were dependent on tissue type, genotype and environmental factors. 'Just Right' roots and shoots consistently had the highest yield and gluconapin concentration of the cultivars examined in field experiments. In most instances, 'Scarlet Queen' roots had the highest total GSL concentrations while 'Just Right' roots had the least. Although colored plastic mulches significantly influenced both total and individual GSL concentrations, mulch-dependent increases in GSL concentrations were not consistent across tissue types, cultivars, planting dates and years of the study. Photoselective nettings did not consistently affect shoot or root yield or GSL concentration in root tissues. Netting was only a significant factor for glucobrassicanapin (GBN) concentration in shoots with the no netting treatment resulting in the highest GBN concentration. Planting date and year interactions were significant for total and individual GSL concentrations and proportions in both plastic mulch and photoselective netting experiments. These interactions are partially explained by differences in air temperatures and solar radiation prior to harvest. To assess the specific role of temperature on GSL concentration and biosynthetic regulation in roots and shoots, turnips were grown under three different temperature regimes in a controlled environment. Gene expression analyses indicate that some BrMYB transcription factor transcript levels are associated with temperature-dependent changes in GSL concentration, however this association varies between cultivar and tissue type. When compared to low temperature treatments, high temperature treatments increased total, aliphatic and indolic GSLs in a tissue and genotype specific manner. Gluconasturtiin (GNS), an aromatic GSL, concentration was inversely correlated with temperature with high temperature treatments resulting in 20% and 48% less GNS than low temperature treatments in JR and SQ roots, respectively. The indolic GSL, 1-methoxyglucobrassicin (1MGB) was the root GSL most elevated by increased temperature resulting in a nine-fold increase on average in both cultivars between the low and high temperature treatments. These results show promise for the use of temperature to enhance the health promoting properties of turnip as 1MGB has potent chemopreventive effects.

ISBN: 9781124218830Subjects--Topical Terms:

1017832
Agriculture, Horticulture.

The effect of light and temperature on glucosinolate concentration in turnip (Brassica rapa).
LDR:03870nam 2200325 4500 001 1398018
005 20110907152303.5
008 130515s2010 ||||||||||||||||| ||eng d
020 $a 9781124218830
035 $a (UMI)AAI3422562
035 $a AAI3422562
040 $a UMI $c UMI
100 1 $a Justen, Veronica Lea. $3 1676885
245 1 4 $a The effect of light and temperature on glucosinolate concentration in turnip (Brassica rapa).
300 $a 89 p.
500 $a Source: Dissertation Abstracts International, Volume: 71-10, Section: B, page: 5861.
500 $a Adviser: Vincent A. Fritz.
502 $a Thesis (Ph.D.)--University of Minnesota, 2010.
520 $a Glucosinolates (GSLs) are thioglucosides produced by turnip ( Brassica rapa subsp. rapa) and other cruciferous vegetables with important properties for plant defense and human health, particularly cancer prevention. We compared yield and GSL concentrations in the roots and shoots of turnip cultivars grown using plastic colored mulch and photoselective netting treatments in both a May and August planting. Turnip yield and GSL concentrations were dependent on tissue type, genotype and environmental factors. 'Just Right' roots and shoots consistently had the highest yield and gluconapin concentration of the cultivars examined in field experiments. In most instances, 'Scarlet Queen' roots had the highest total GSL concentrations while 'Just Right' roots had the least. Although colored plastic mulches significantly influenced both total and individual GSL concentrations, mulch-dependent increases in GSL concentrations were not consistent across tissue types, cultivars, planting dates and years of the study. Photoselective nettings did not consistently affect shoot or root yield or GSL concentration in root tissues. Netting was only a significant factor for glucobrassicanapin (GBN) concentration in shoots with the no netting treatment resulting in the highest GBN concentration. Planting date and year interactions were significant for total and individual GSL concentrations and proportions in both plastic mulch and photoselective netting experiments. These interactions are partially explained by differences in air temperatures and solar radiation prior to harvest. To assess the specific role of temperature on GSL concentration and biosynthetic regulation in roots and shoots, turnips were grown under three different temperature regimes in a controlled environment. Gene expression analyses indicate that some BrMYB transcription factor transcript levels are associated with temperature-dependent changes in GSL concentration, however this association varies between cultivar and tissue type. When compared to low temperature treatments, high temperature treatments increased total, aliphatic and indolic GSLs in a tissue and genotype specific manner. Gluconasturtiin (GNS), an aromatic GSL, concentration was inversely correlated with temperature with high temperature treatments resulting in 20% and 48% less GNS than low temperature treatments in JR and SQ roots, respectively. The indolic GSL, 1-methoxyglucobrassicin (1MGB) was the root GSL most elevated by increased temperature resulting in a nine-fold increase on average in both cultivars between the low and high temperature treatments. These results show promise for the use of temperature to enhance the health promoting properties of turnip as 1MGB has potent chemopreventive effects.
590 $a School code: 0130.
650 4 $a Agriculture, Horticulture. $3 1017832
650 4 $a Biology, Plant Physiology. $3 1017865
690 $a 0471
690 $a 0817
710 2 $a University of Minnesota. $b Applied Plant Sciences. $3 1271129
773 0 $t Dissertation Abstracts International $g 71-10B.
790 1 0 $a Fritz, Vincent A., $e advisor
790 1 0 $a Cohen, Jerry D. $e committee member
790 1 0 $a Hoover, Emily $e committee member
790 1 0 $a Smith, Alan $e committee member
790 1 0 $a Springer, Nathan $e committee member
790 $a 0130
791 $a Ph.D.
792 $a 2010
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3422562