A polygalacturonase gene clustered into clade E involved in lychee fruitlet abscission

Peng, Gang; Wu, Jianyang; Lu, Wang-jin; Li, Jianguo

doi:10.1016/j.scienta.2012.10.029

Cited by 36 publications

(39 citation statements)

References 51 publications

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“…Our results showed that most peach PG genes of subclass E are expressed in the ripening fruit (Figure 2), which is similar to the results in Arabidopsis [31]. In addition, the involvement of PG genes of E subclass in fruit abscission was also observed in lychee and Elaeis guineensis [26,42] Therefore, most fruit related PG genes may belongs to E subclass, which may be related to their conserved functions in fruit abscission and/or ripening. Except for very low expression of PpPG39 , peach PG genes of subclasses D and F are not expressed in ripening fruit, which suggests that these PG genes cannot be involved in peach fruit softening during ripening.…”

Section: Discussionsupporting

confidence: 86%

“…PG is a cell wall hydrolytic enzyme with important roles in many physiological processes, such as fruit ripening, seed germination, cell elongation, organ abscission and pollen tube elongation [4,12,14,20,26,30,38]. PGs are encoded by a typical large gene family in plants, and the PG gene family has been identified and characterized in some plants such as Arabidopsis , Populus , rice, Cucumis sativus and Citrullus lanatus [29,31,32,33].…”

Section: Discussionmentioning

confidence: 99%

“…Interestingly, peach fruit melting and freestone are also controlled by Endo-PGs [22,23,24,25]. In addition, PG genes also participate in the organ abscission of lychee, oilseed rape, Arabidopsis and tomato [26,27,28]. In Arabidopsis , QUARTET2 ( QRT2 ) is involved in pollen grain separation [29], and ADPG1 and ADPG2 are related to silique dehiscence and floral organ abscission [30].…”

Section: Introductionmentioning

confidence: 99%

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Identification and Expression Analysis of Polygalacturonase Family Members during Peach Fruit Softening

Qian

Zhang

Yan

et al. 2016

IJMS

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Polygalacturonase (PG) is an important hydrolytic enzyme involved in pectin degradation during fruit softening. However, the roles of PG family members in fruit softening remain unclear. We identified 45 PpPG genes in the peach genome which are clustered into six subclasses. PpPGs consist of four to nine exons and three to eight introns, and the exon/intron structure is basically conserved in all but subclass E. Only 16 PpPG genes were expressed in ripening fruit, and their expression profiles were analyzed during storage in two peach cultivars with different softening characteristics. Eight PGs (PpPG1, -10, -12, -13, -15, -23, -21, and -22) in fast-softening “Qian Jian Bai” (QJB) fruit and three PGs (PpPG15, -21, and -22) in slow-softening “Qin Wang” (QW) fruit exhibited softening-associated patterns; which also were affected by ethylene treatment. Our results suggest that the different softening characters in QW and QJB fruit is related to the amount of PG members. While keeping relatively lower levels during QW fruit softening, the expression of six PGs (PpPG1, -10, -12, -11, -14, and -35) rapidly induced by ethylene. PpPG24, -25 and -38 may not be involved in softening of peach fruit.

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Section: Discussionsupporting

confidence: 86%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Identification and Expression Analysis of Polygalacturonase Family Members during Peach Fruit Softening

Qian

Zhang

Yan

et al. 2016

IJMS

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“…Given that carbohydrate deficiency in fruit is likely the first event during the fruit abscission in litchi, the possible molecular events associated with fruit abscission were investigated by RNA-Seq under carbohydrate deficiency-inducing treatments such as shading and GPD [15,16,27,30]. Shading treatment was conducted using a neutral-density black-polypropylene shade cloth allowing 18% of full sun at 30 days after anthesis, while GPD treatment was performed with girdling (a ring of bark about 0.5 cm in width and cambium was removed from the branch base) followed by defoliation (removing all leaves above the girdle) at 35 days after anthesis.…”

Section: The Possible Molecular Events Associated With Fruitlet Abscimentioning

confidence: 99%

“…Carbohydrate stress treatments such as shading, GPD, and ethephon application (ETH) had been proven to be reliable experimental models that induce more than 90% fruitlet to drop within one week [15,17,[26][27][28][29]. Whereas the 2,4-dichlorophenoxyacetic acid (2,4-D) was shown to be an effective chemical to reduce the litchi fruitlet abscission [30]. To investigate the molecular events associated with fruitlet abscission under these treatments in litchi, the RNA-seq approach was used to profile the differentially expressed genes (DEGs) ( Table 1).…”

Section: Introductionmentioning

confidence: 99%

Molecular Events Involved in Fruitlet Abscission in Litchi

Zhao

2020

Plants

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Abscission in plants is an active and highly coordinated physiological process in which organs abscise from the plant body at the abscission zone (AZ) in responding to either developmental or environmental cues. Litchi (Litchi chinensis Sonn.) is an important economic fruit crop widely grown in Southeast Asia particularly in South China. However, the excessive fruit drop during fruit development is a major limiting factor for litchi production. Thus, it is an important agricultural concern to understand the mechanisms underlying the fruit abscission in litchi. Here, we present a review focusing on the molecular events involved in the fruitlet abscission. We also highlight the recent advances on genes specifically associated with fruit abscission and perspectives for future research.

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Diversity and Functional Dynamics of Fleshy Fruit Abscission Zones

Tranbarger

Tadeo

2020

Annual Plant Reviews Online

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We examine the current knowledge about the abscission of fleshy fruit, in particular with regards to the development and function of the abscission zone (AZ). While tomato is currently the main model species to elucidate the mechanisms of fleshy fruit abscission, most studies on tomato focus on the development and function of the pedicel AZ, which is involved in both flower and ripe fruit abscission. However, the localization of the AZ within the pedicel is not the most common location of the AZ for fleshy fruit. Fleshy fruit can have one or more AZ, which can be found in different locations within the inflorescence and fruiting structure and fulfil different functions. In fact, most of the fleshy fruit species examined thus far have more than one AZ, which can be found at the boundary between the fruit and pedicel (often referred to as the calyx AZ), within the pedicel as with tomato, at the juncture of the pedicel and peduncle or at the juncture between peduncle and shoot/branch. In addition, the different AZs may be activated or function at different stages of development, under different environmental conditions, or have a completely different purpose, such as the abscission of fruitlets or mature fruit. Together, our current knowledge about AZs suggests that while there are similarities between different AZs in different locations or from different species, not all AZs are created equal, which may be reflected in the underlying molecular mechanisms that control their development and function.

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A polygalacturonase gene clustered into clade E involved in lychee fruitlet abscission

Cited by 36 publications

References 51 publications

Identification and Expression Analysis of Polygalacturonase Family Members during Peach Fruit Softening

Identification and Expression Analysis of Polygalacturonase Family Members during Peach Fruit Softening

Molecular Events Involved in Fruitlet Abscission in Litchi

Diversity and Functional Dynamics of Fleshy Fruit Abscission Zones

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