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Effect of Plant Growth Regulator Application, Root-Shoot Balance, and Source:Sink Gradients on Flush Phenology in Citrus.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Effect of Plant Growth Regulator Application, Root-Shoot Balance, and Source:Sink Gradients on Flush Phenology in Citrus./
Author:	Li, Sheng-yang.
Description:	1 online resource (107 pages)
Notes:	Source: Dissertations Abstracts International, Volume: 84-08, Section: B.
Contained By:	Dissertations Abstracts International84-08B.
Subject:	Agriculture. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=29063856click for full text (PQDT)
ISBN:	9798368456003

Effect of Plant Growth Regulator Application, Root-Shoot Balance, and Source:Sink Gradients on Flush Phenology in Citrus.
Li, Sheng-yang.

Effect of Plant Growth Regulator Application, Root-Shoot Balance, and Source:Sink Gradients on Flush Phenology in Citrus. - 1 online resource (107 pages)

Source: Dissertations Abstracts International, Volume: 84-08, Section: B.

Thesis (Ph.D.)--University of Florida, 2022.

Includes bibliographical references

Flushing is the initiation of canopy-wide shoot growth regulated by external and internal factors. Understanding these factors may clarify how the citrus plant modulates flush growth over time, its flush phenology. In citrus groves, production and pest management are impacted by flush phenology. Understanding flush phenology can improve prediction of the onset of new flush. Such understanding can help improve both grove and pest management. We hypothesized that flush phenology can be modulated by exogenous phytohormone applications and individual bud maturity. Secondly, we hypothesized that source:sink can modulate the growth patterns of shoot flush. Based on these hypotheses, the research firstly aimed to evaluate the effect of gibberellin (GA3) in modulating flush phenology. The results suggested bud sprouting could be increased by GA3, but new flush is likely a whole-tree level response, requiring a maturation time of approximately eight weeks since the last flush before the GA3 application had an impact. Additionally, more flushes were observed on the apical nodes. We then investigated the effect of root:shoot and the effect of source:sink on photosynthesis, translocation dynamics, root, and shoot growth. Suppressing root:shoot by limiting root growth using water deficit had little impact on flush phenology unless a defoliation occurred. Low source:sink caused by leaf loss affected flush phenology and triggered new flush initiation. Low source:sink induced by manual defoliation increased photosynthesis but affected neither translocation velocity nor leaf export. Leaf export was positively associated with leaf position, suggesting that the individual leaf may distribute photoassimilates differently, depending on the position of the shoot, indifferently of source:sink conditions. No accelerated basipetal translocation was detected. These results suggested that a large proportion of assimilates might remain in the shoot apexes after defoliation. Considering the whole-tree level response in flushing, the high export of apex leaf may be related to the fact that more flushes are from the shoot apexes. Thus, flush phenology in citrus is a whole tree level response, which could be affected by exogenous GA3 application and modulated by root:shoot and low source:sink. Low source:sink induces new flush, accelerates the emergence of new flush and induces higher flush abundance. Those flush responses, such as the higher flush abundance can be regarded as a rebalancing process for source:sink, affecting flush phenology in citrus.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2023

Mode of access: World Wide Web

ISBN: 9798368456003Subjects--Topical Terms:

518588
Agriculture.
Subjects--Index Terms:

Carbohydrate translocationIndex Terms--Genre/Form:

542853
Electronic books.

Effect of Plant Growth Regulator Application, Root-Shoot Balance, and Source:Sink Gradients on Flush Phenology in Citrus.
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245 1 0 $a Effect of Plant Growth Regulator Application, Root-Shoot Balance, and Source:Sink Gradients on Flush Phenology in Citrus.
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500 $a Source: Dissertations Abstracts International, Volume: 84-08, Section: B.
500 $a Advisor: Vincent, Christopher Issac.
502 $a Thesis (Ph.D.)--University of Florida, 2022.
504 $a Includes bibliographical references
520 $a Flushing is the initiation of canopy-wide shoot growth regulated by external and internal factors. Understanding these factors may clarify how the citrus plant modulates flush growth over time, its flush phenology. In citrus groves, production and pest management are impacted by flush phenology. Understanding flush phenology can improve prediction of the onset of new flush. Such understanding can help improve both grove and pest management. We hypothesized that flush phenology can be modulated by exogenous phytohormone applications and individual bud maturity. Secondly, we hypothesized that source:sink can modulate the growth patterns of shoot flush. Based on these hypotheses, the research firstly aimed to evaluate the effect of gibberellin (GA3) in modulating flush phenology. The results suggested bud sprouting could be increased by GA3, but new flush is likely a whole-tree level response, requiring a maturation time of approximately eight weeks since the last flush before the GA3 application had an impact. Additionally, more flushes were observed on the apical nodes. We then investigated the effect of root:shoot and the effect of source:sink on photosynthesis, translocation dynamics, root, and shoot growth. Suppressing root:shoot by limiting root growth using water deficit had little impact on flush phenology unless a defoliation occurred. Low source:sink caused by leaf loss affected flush phenology and triggered new flush initiation. Low source:sink induced by manual defoliation increased photosynthesis but affected neither translocation velocity nor leaf export. Leaf export was positively associated with leaf position, suggesting that the individual leaf may distribute photoassimilates differently, depending on the position of the shoot, indifferently of source:sink conditions. No accelerated basipetal translocation was detected. These results suggested that a large proportion of assimilates might remain in the shoot apexes after defoliation. Considering the whole-tree level response in flushing, the high export of apex leaf may be related to the fact that more flushes are from the shoot apexes. Thus, flush phenology in citrus is a whole tree level response, which could be affected by exogenous GA3 application and modulated by root:shoot and low source:sink. Low source:sink induces new flush, accelerates the emergence of new flush and induces higher flush abundance. Those flush responses, such as the higher flush abundance can be regarded as a rebalancing process for source:sink, affecting flush phenology in citrus.
533 $a Electronic reproduction. $b Ann Arbor, Mich. : $c ProQuest, $d 2023
538 $a Mode of access: World Wide Web
650 4 $a Agriculture. $3 518588
650 4 $a Botany. $3 516217
653 $a Carbohydrate translocation
653 $a Citrus
653 $a Flush phenology
653 $a Photosynthesis
653 $a Radioisotopic tracer
653 $a Source-sink ratio
655 7 $a Electronic books. $2 lcsh $3 542853
690 $a 0473
690 $a 0309
710 2 $a ProQuest Information and Learning Co. $3 783688
710 2 $a University of Florida. $b Horticultural Sciences. $3 3703219
773 0 $t Dissertations Abstracts International $g 84-08B.
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=29063856 $z click for full text (PQDT)