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 Biological Mechanism Behind Earl...

Engelsma, Alexander J.

Linked to FindBook

Google Book

Amazon

博客來

The Biological Mechanism Behind Early and Late Apple Sports.

Record Type:	Electronic resources : Monograph/item
Title/Author:	The Biological Mechanism Behind Early and Late Apple Sports./
Author:	Engelsma, Alexander J.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2024,
Description:	112 p.
Notes:	Source: Masters Abstracts International, Volume: 86-02.
Contained By:	Masters Abstracts International86-02.
Subject:	Horticulture. -
Online resource:	https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=31337161
ISBN:	9798383595398

The Biological Mechanism Behind Early and Late Apple Sports.
Engelsma, Alexander J.

The Biological Mechanism Behind Early and Late Apple Sports. - Ann Arbor : ProQuest Dissertations & Theses, 2024 - 112 p.

Source: Masters Abstracts International, Volume: 86-02.

Thesis (M.S.)--Michigan State University, 2024.

Somatic mutations in apple commonly develop into viable bud sports that can be propagated clonally. When the apple bud sport has a desirable attribute such as improved color, size, shape, flavor, firmness, sweetness, or harvest timing, it has potential to be introduced as a new cultivar that growers utilize, and consumers enjoy. The genetic mutations and related mechanisms associated with early or delayed maturation (respectively resulting in early or late harvest date) in apple sports are not known despite their value to the industry. By acquiring knowledge about genetic mutations affecting harvest date and their respective molecular mechanisms, breeders can identify markers to conduct more informed crosses to select for early or late maturing apple lines. Potentially, apple lines with 'designed' harvest windows could be developed to optimize the deployment of field laborers for the apple harvest and improve use of cultural practices to influence harvest time. Comparison of physiology-based markers of fruit developmental stages for apple sports with different maturation dates has been done, but, to the author's knowledge, not on trees for which crop load has been appropriately adjusted to eliminate its effect on developmental rate. In this study, crop load was precisely adjusted for the late maturing 'Gala' sport 'Autumn Gala', the early maturing 'Fuji' sport 'September Wonder Fuji', and the early maturing 'Cripps Pink' ('Pink Lady®') sport 'Maslin Cripps Pink', as well as for controls for each cultivar (i.e., those possessing standard harvest times). We found that in each comparison, fruit growth rate of the early variant was significantly greater early in fruit development, during the cell division phase. The early emergence of phenotypic differences in growth rate between the bud sport and the control lines suggests the physiological processes leading to an early or late harvest date may also emerge very early in fruit development. If so, the early or delayed maturation date is very likely not strictly a function of ripening-related processes, but rather is derived from a season-long shift in metabolic activity. Genomic analyses were also done to identify genetic differences between early and late apple sports. Collectively, hundreds of genetic variants were identified. A future transcriptomic analysis will reduce these variant lists to a smaller set of candidate mutations responsible for the altered maturity time. Our phenological studies reduced the developmental window for these transcriptomic investigations.

ISBN: 9798383595398Subjects--Topical Terms:

555447
Horticulture.
Subjects--Index Terms:

Apple

The Biological Mechanism Behind Early and Late Apple Sports.
LDR:03662nmm a2200385 4500 001 2403512
005 20241118085755.5
006 m o d
007 cr#unu||||||||
008 251215s2024 ||||||||||||||||| ||eng d
020 $a 9798383595398
035 $a (MiAaPQ)AAI31337161
035 $a AAI31337161
040 $a MiAaPQ $c MiAaPQ
100 1 $a Engelsma, Alexander J. $0 (orcid)0000-0002-1440-7827 $3 3773785
245 1 0 $a The Biological Mechanism Behind Early and Late Apple Sports.
260 1 $a Ann Arbor : $b ProQuest Dissertations & Theses, $c 2024
300 $a 112 p.
500 $a Source: Masters Abstracts International, Volume: 86-02.
500 $a Advisor: Hollender, Courtney A.;Beaudry, Randolph M.
502 $a Thesis (M.S.)--Michigan State University, 2024.
520 $a Somatic mutations in apple commonly develop into viable bud sports that can be propagated clonally. When the apple bud sport has a desirable attribute such as improved color, size, shape, flavor, firmness, sweetness, or harvest timing, it has potential to be introduced as a new cultivar that growers utilize, and consumers enjoy. The genetic mutations and related mechanisms associated with early or delayed maturation (respectively resulting in early or late harvest date) in apple sports are not known despite their value to the industry. By acquiring knowledge about genetic mutations affecting harvest date and their respective molecular mechanisms, breeders can identify markers to conduct more informed crosses to select for early or late maturing apple lines. Potentially, apple lines with 'designed' harvest windows could be developed to optimize the deployment of field laborers for the apple harvest and improve use of cultural practices to influence harvest time. Comparison of physiology-based markers of fruit developmental stages for apple sports with different maturation dates has been done, but, to the author's knowledge, not on trees for which crop load has been appropriately adjusted to eliminate its effect on developmental rate. In this study, crop load was precisely adjusted for the late maturing 'Gala' sport 'Autumn Gala', the early maturing 'Fuji' sport 'September Wonder Fuji', and the early maturing 'Cripps Pink' ('Pink Lady®') sport 'Maslin Cripps Pink', as well as for controls for each cultivar (i.e., those possessing standard harvest times). We found that in each comparison, fruit growth rate of the early variant was significantly greater early in fruit development, during the cell division phase. The early emergence of phenotypic differences in growth rate between the bud sport and the control lines suggests the physiological processes leading to an early or late harvest date may also emerge very early in fruit development. If so, the early or delayed maturation date is very likely not strictly a function of ripening-related processes, but rather is derived from a season-long shift in metabolic activity. Genomic analyses were also done to identify genetic differences between early and late apple sports. Collectively, hundreds of genetic variants were identified. A future transcriptomic analysis will reduce these variant lists to a smaller set of candidate mutations responsible for the altered maturity time. Our phenological studies reduced the developmental window for these transcriptomic investigations.
590 $a School code: 0128.
650 4 $a Horticulture. $3 555447
650 4 $a Physiology. $3 518431
650 4 $a Plant sciences. $3 3173832
653 $a Apple
653 $a Bud sport
653 $a Development
653 $a Maturity
653 $a Genetics
690 $a 0471
690 $a 0479
690 $a 0719
710 2 $a Michigan State University. $b Horticulture - Master of Science. $3 3170718
773 0 $t Masters Abstracts International $g 86-02.
790 $a 0128
791 $a M.S.
792 $a 2024
793 $a English
856 4 0 $u https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=31337161