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Fruit Growth and Hormonal Regulation of Bitter Pit in 'Honeycrisp' Apple
Fruit Growth and Hormonal Regulation of Bitter Pit in 'Honeycrisp' Apple
Fruit Growth and Hormonal Regulation of Bitter Pit in 'Honeycrisp' Apple

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자료유형  
 학위논문 서양
최종처리일시  
20260202104825
ISBN  
9798290944678
DDC  
635
저자명  
Griffith, Chayce.
서명/저자  
Fruit Growth and Hormonal Regulation of Bitter Pit in Honeycrisp Apple
발행사항  
[Sl] : Michigan State University, 2025
발행사항  
Ann Arbor : ProQuest Dissertations & Theses, 2025
형태사항  
178 p
주기사항  
Source: Dissertations Abstracts International, Volume: 87-02, Section: B.
주기사항  
Advisor: Einhorn, Todd.
학위논문주기  
Thesis (Ph.D.)--Michigan State University, 2025.
초록/해제  
요약Bitter pit is a physiological disorder of the outer cortex of apple fruit. Bitter pit is of great commercial interest as 'Honeycrisp', the fourth-most widely grown and most profitable apple cultivar in the United States, is especially susceptible with losses of greater than 40% in years of high incidence in Michigan. The disorder results from calcium-deficiency, but is not eliminated by calcium applications and is only poorly predicted by fruit calcium concentration at maturity. The mechanistic reasons behind this remain poorly understood.Because calcium transport, in-planta, occurs exclusively in the xylem, experiments were designed to manipulate the rate of xylem dysfunction in 'Honeycrisp'. The first study utilized auxins and ABA to prolong xylem functionality with the goal of reducing bitter pit. These treatments did improve primary bundle longevity and reduced bitter pit incidence by roughly 60%, but did not improve fruit calcium. A second study again examined the effects of the most efficacious rates of the PGRs from the previous study, IAA, NAA, and ABA, on xylem function, fruit calcium and bitter pit, but did so weekly to observe how fruit growth, xylem function, and calcium changed as a result of treatment. NAA and ABA treatments again reduced bitter pit incidence by increasing cumulative xylem function (CXF). CXF was consistently correlated to bitter pit incidence while primary bundle counts and fruit calcium concentrations were not.A third study paired experiments designed to manipulate fruit growth rate, believed to be the cause of xylem dysfunction, through sink competition (crop load) and shading. Growth of fruit, in the form of cumulative relative growth rate, was consistent across xylem dysfunction benchmarks, linking rapid fruit growth with increased incidence of bitter pit through strain-induced dysfunction of xylem networks in the outer cortex.The results of these studies give support for the partial reclassification of bitter pit from a calcium-deficiency disorder to a hormone-imbalance or growth disorder.
일반주제명  
Horticulture
일반주제명  
Physiology
일반주제명  
Plant sciences
키워드  
Calcium-deficiency
키워드  
Growth modeling
키워드  
Peripheral xylem
키워드  
Plant growth regulators
키워드  
Rapid growth
키워드  
Xylem dysfunction
기타저자  
Michigan State University Horticulture - Doctor of Philosophy
기본자료저록  
Dissertations Abstracts International. 87-02B.
전자적 위치 및 접속  
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■035    ▼a(MiAaPQ)AAI32169760
■040    ▼aMiAaPQ▼cMiAaPQ
■0820  ▼a635
■1001  ▼aGriffith,  Chayce.
■24510▼aFruit  Growth  and  Hormonal  Regulation  of  Bitter  Pit  in  'Honeycrisp'  Apple
■260    ▼a[Sl]▼bMichigan  State  University▼c2025
■260  1▼aAnn  Arbor▼bProQuest  Dissertations  &  Theses▼c2025
■300    ▼a178  p
■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  87-02,  Section:  B.
■500    ▼aAdvisor:  Einhorn,  Todd.
■5021  ▼aThesis  (Ph.D.)--Michigan  State  University,  2025.
■520    ▼aBitter  pit  is  a  physiological  disorder  of  the  outer  cortex  of  apple  fruit.  Bitter  pit  is  of  great  commercial  interest  as  'Honeycrisp',  the  fourth-most  widely  grown  and  most  profitable  apple  cultivar  in  the  United  States,  is  especially  susceptible  with  losses  of  greater  than  40%  in  years  of  high  incidence  in  Michigan.  The  disorder  results  from  calcium-deficiency,  but  is  not  eliminated  by  calcium  applications  and  is  only  poorly  predicted  by  fruit  calcium  concentration  at  maturity.  The  mechanistic  reasons  behind  this  remain  poorly  understood.Because  calcium  transport,  in-planta,  occurs  exclusively  in  the  xylem,  experiments  were  designed  to  manipulate  the  rate  of  xylem  dysfunction  in  'Honeycrisp'.  The  first  study  utilized  auxins  and  ABA  to  prolong  xylem  functionality  with  the  goal  of  reducing  bitter  pit.  These  treatments  did  improve  primary  bundle  longevity  and  reduced  bitter  pit  incidence  by  roughly  60%,  but  did  not  improve  fruit  calcium.  A  second  study  again  examined  the  effects  of  the  most  efficacious  rates  of  the  PGRs  from  the  previous  study,  IAA,  NAA,  and  ABA,  on  xylem  function,  fruit  calcium  and  bitter  pit,  but  did  so  weekly  to  observe  how  fruit  growth,  xylem  function,  and  calcium  changed  as  a  result  of  treatment.  NAA  and  ABA  treatments  again  reduced  bitter  pit  incidence  by  increasing  cumulative  xylem  function  (CXF).  CXF  was  consistently  correlated  to  bitter  pit  incidence  while  primary  bundle  counts  and  fruit  calcium  concentrations  were  not.A  third  study  paired  experiments  designed  to  manipulate  fruit  growth  rate,  believed  to  be  the  cause  of  xylem  dysfunction,  through  sink  competition  (crop  load)  and  shading.  Growth  of  fruit,  in  the  form  of  cumulative  relative  growth  rate,  was  consistent  across  xylem  dysfunction  benchmarks,  linking  rapid  fruit  growth  with  increased  incidence  of  bitter  pit  through  strain-induced  dysfunction  of  xylem  networks  in  the  outer  cortex.The  results  of  these  studies  give  support  for  the  partial  reclassification  of  bitter  pit  from  a  calcium-deficiency  disorder  to  a  hormone-imbalance  or  growth  disorder.
■590    ▼aSchool  code:  0128.
■650  4▼aHorticulture
■650  4▼aPhysiology
■650  4▼aPlant  sciences
■653    ▼aCalcium-deficiency
■653    ▼aGrowth  modeling
■653    ▼aPeripheral  xylem
■653    ▼aPlant  growth  regulators
■653    ▼aRapid  growth
■653    ▼aXylem  dysfunction
■690    ▼a0471
■690    ▼a0479
■690    ▼a0719
■71020▼aMichigan  State  University▼bHorticulture  -  Doctor  of  Philosophy.
■7730  ▼tDissertations  Abstracts  International▼g87-02B.
■790    ▼a0128
■791    ▼aPh.D.
■792    ▼a2025
■793    ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17359038▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.

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