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

Exploring the Roles of Auxin Transpo...

Cowling, Craig Leroy,

Linked to FindBook

Google Book

Amazon

博客來

Exploring the Roles of Auxin Transport and Stigmasterol in Plant Development /

Record Type:	Electronic resources : Monograph/item
Title/Author:	Exploring the Roles of Auxin Transport and Stigmasterol in Plant Development // Craig Leroy Cowling.
Author:	Cowling, Craig Leroy,
Description:	1 electronic resource (138 pages)
Notes:	Source: Dissertations Abstracts International, Volume: 86-12, Section: A.
Contained By:	Dissertations Abstracts International86-12A.
Subject:	Plant sciences. -
Online resource:	https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=31994912
ISBN:	9798286431359

Exploring the Roles of Auxin Transport and Stigmasterol in Plant Development /
Cowling, Craig Leroy,

Exploring the Roles of Auxin Transport and Stigmasterol in Plant Development /Craig Leroy Cowling. - 1 electronic resource (138 pages)

Source: Dissertations Abstracts International, Volume: 86-12, Section: A.

Plants are essential for nearly every ecosystem, functioning as a primary food source, producing oxygen, regulating climate, filtering water, and shaping landscapes. Because most plants are unable to move freely, plants must adapt to their environment to survive. How plants grow and respond to their environment has been extensively studied, yet the complexity of plant biology leaves many mysteries unanswered. Hormones such as auxin and sterols are key influencers of plant development and environmental responses. This research focused on addressing key knowledge gaps in the hormone biology field using model plants Zea mays (maize) and Arabidopsis thaliana (thale cress). First, this study characterizes the roles of the evolutionarily conserved PIN-LIKES (PILS) auxin transporters, PILS2 and PILS6, in determining plant architecture traits in Arabidopsis and maize. Molecular and genetic analyses of the maize and Arabidopsis orthologs indicates that these two PILS orthologs have unique and non-redundant functions in organ formation. These findings highlight the importance of these proteins in maintaining auxin gradients within growing organs such as roots and shoots for proper organ size and formation. Additionally, this work investigated the role of one phytosterol, stigmasterol, in abiotic stress response. CYP710A8 is the final enzyme in stigmasterol biosynthesis in maize. An analysis of stigmasterol-deficient transcriptome shows significant changes in gene expression related to abiotic stress. Stigmasterol-deficient plants exhibit enhanced tolerance to salt stress, with altered levels of phytohormones, suggesting a compensatory mechanism that enhances resilience. This indicates that manipulating sterol biosynthetic pathways could be a strategy for developing stress-resilient crops without compromising growth under optimal conditions. These studies provide insights into the molecular mechanisms of plant growth and stress responses, emphasizing the roles of auxin transport and sitosterol to stigmasterol conversion. The research offers potential strategies for crop improvement, highlighting the significance of auxin homeostasis in organ size control and the potential of sterol engineering in enhancing stress tolerance. These findings contribute to our understanding of plant biology and the development of innovative approaches to improve agricultural productivity and sustainability.

English

ISBN: 9798286431359Subjects--Topical Terms:

3173832
Plant sciences.
Subjects--Index Terms:

Auxin

Exploring the Roles of Auxin Transport and Stigmasterol in Plant Development /
LDR:03878nmm a22004453i 4500 001 2433464
005 20250825062337.5
006 m o d
007 cr|nu||||||||
008 261011s2025 miu||||||m |||||||eng d
020 $a 9798286431359
035 $a (MiAaPQD)AAI31994912
035 $a AAI31994912
040 $a MiAaPQD $b eng $c MiAaPQD $e rda
100 1 $a Cowling, Craig Leroy, $e author. $0 (orcid)0000-0002-8081-0681 $3 3823086
245 1 0 $a Exploring the Roles of Auxin Transport and Stigmasterol in Plant Development / $c Craig Leroy Cowling.
264 1 $a Ann Arbor : $b ProQuest Dissertations & Theses, $c 2025
300 $a 1 electronic resource (138 pages)
336 $a text $b txt $2 rdacontent
337 $a computer $b c $2 rdamedia
338 $a online resource $b cr $2 rdacarrier
500 $a Source: Dissertations Abstracts International, Volume: 86-12, Section: A.
500 $a Advisors: Kelley, Dior R. Committee members: Walley, Justin W.; Yandeau-Nelson, Marna D.; Aung, Kyaw; Suza, Walter P.
502 $b Ph.D. $c Iowa State University $d 2025.
520 $a Plants are essential for nearly every ecosystem, functioning as a primary food source, producing oxygen, regulating climate, filtering water, and shaping landscapes. Because most plants are unable to move freely, plants must adapt to their environment to survive. How plants grow and respond to their environment has been extensively studied, yet the complexity of plant biology leaves many mysteries unanswered. Hormones such as auxin and sterols are key influencers of plant development and environmental responses. This research focused on addressing key knowledge gaps in the hormone biology field using model plants Zea mays (maize) and Arabidopsis thaliana (thale cress). First, this study characterizes the roles of the evolutionarily conserved PIN-LIKES (PILS) auxin transporters, PILS2 and PILS6, in determining plant architecture traits in Arabidopsis and maize. Molecular and genetic analyses of the maize and Arabidopsis orthologs indicates that these two PILS orthologs have unique and non-redundant functions in organ formation. These findings highlight the importance of these proteins in maintaining auxin gradients within growing organs such as roots and shoots for proper organ size and formation. Additionally, this work investigated the role of one phytosterol, stigmasterol, in abiotic stress response. CYP710A8 is the final enzyme in stigmasterol biosynthesis in maize. An analysis of stigmasterol-deficient transcriptome shows significant changes in gene expression related to abiotic stress. Stigmasterol-deficient plants exhibit enhanced tolerance to salt stress, with altered levels of phytohormones, suggesting a compensatory mechanism that enhances resilience. This indicates that manipulating sterol biosynthetic pathways could be a strategy for developing stress-resilient crops without compromising growth under optimal conditions. These studies provide insights into the molecular mechanisms of plant growth and stress responses, emphasizing the roles of auxin transport and sitosterol to stigmasterol conversion. The research offers potential strategies for crop improvement, highlighting the significance of auxin homeostasis in organ size control and the potential of sterol engineering in enhancing stress tolerance. These findings contribute to our understanding of plant biology and the development of innovative approaches to improve agricultural productivity and sustainability.
546 $a English
590 $a School code: 0097
650 4 $a Plant sciences. $3 3173832
650 4 $a Agriculture. $3 518588
650 4 $a Bioengineering. $3 657580
650 4 $a Sustainability. $3 1029978
653 $a Auxin
653 $a PIN-LIKES
653 $a Stigmasterol
653 $a Zea mays
653 $a CYP710A8
690 $a 0479
690 $a 0202
690 $a 0640
690 $a 0473
710 2 $a Iowa State University. $b Genetics, Development and Cell Biology. $e degree granting institution. $3 3823087
720 1 $a Kelley, Dior R. $e degree supervisor.
773 0 $t Dissertations Abstracts International $g 86-12A.
790 $a 0097
791 $a Ph.D.
792 $a 2025
856 4 0 $u https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=31994912