Removal of DELLA repression promotes leaf senescence in Arabidopsis

Chen, Mingxun; Maodzeka, Antony; Zhou, Longhua; Ali, Essa; Wang, Zhong; Jiang, Lixi

doi:10.1016/j.plantsci.2013.11.016

Cited by 55 publications

(36 citation statements)

References 72 publications

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“…A previous report has shown that Arabidopsis bHLH93 promotes plant flowering under short‐day conditions by regulating the expression of gibberellin biosynthesis and metabolism‐associated genes (Sharma et al ., ). Considering the fact that gibberellins are positive regulators of leaf senescence (Chen et al ., , ), it will be interesting to determine whether bHLH93 also plays a role in gibberellin‐induced leaf senescence.…”

Section: Discussionmentioning

confidence: 99%

MdbHLH93, an apple activator regulating leaf senescence, is regulated by ABA and MdBT2 in antagonistic ways

Zhang

et al. 2019

New Phytologist

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Summary The molecular mechanism of leaf senescence in apple (Malus domestica) is still not fully understood. We used gene expression analysis and protein–protein interactions to decipher the relationships of abscisic acid (ABA) and two proteins, MdbHLH93 and MdBT2, in the senescence process. We found that MdbHLH93 promoted leaf senescence and the expression of senescence‐related genes, which exhibited similar effects to ABA on leaf senescence. MdbHLH93 activated directly the transcription of MdSAG18. We also found that an ABA‐responsive protein, MdBT2, interacted directly with MdbHLH93, and induced the ubiquitination and degradation of the MdbHLH93 protein, and thus delayed leaf senescence. Our findings provide new insights into the regulatory network of leaf senescence through the functional interactions among ABA, MdbHLH93 and MdBT2.

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Section: Discussionmentioning

confidence: 99%

MdbHLH93, an apple activator regulating leaf senescence, is regulated by ABA and MdBT2 in antagonistic ways

Zhang

et al. 2019

New Phytologist

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“…JA, salicylic acid (SA), gibberellin (GA), ethylene (ET), and abscisic acid (ABA) promote senescence (Pourtau et al, 2004;Li et al, 2013;Chen et al, 2014;Yang et al, 2014), while auxin delays senescence . Current studies showed that JA interacts with SA and auxin in regulating senescence: SA antagonizes JA to induce the expression of WRKY70/WRKY53, which promote/repress natural senescence (Li et al, 2004;Miao and Zentgraf, 2007;Ulker et al, 2007;Xie et al, 2014).…”

Section: Discussionmentioning

confidence: 99%

Regulation of Jasmonate-Induced Leaf Senescence by Antagonism between bHLH Subgroup IIIe and IIId Factors in Arabidopsis

et al. 2015

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Plants initiate leaf senescence to relocate nutrients and energy from aging leaves to developing tissues or storage organs for growth, reproduction, and defense. Leaf senescence, the final stage of leaf development, is regulated by various environmental stresses, developmental cues, and endogenous hormone signals. Jasmonate (JA), a lipid-derived phytohormone essential for plant defense and plant development, serves as an important endogenous signal to activate senescence-associated gene expression and induce leaf senescence. This study revealed one of the mechanisms underlying JA-induced leaf senescence: antagonistic interactions of the bHLH subgroup IIIe factors MYC2, MYC3, and MYC4 with the bHLH subgroup IIId factors bHLH03, bHLH13, bHLH14, and bHLH17. We showed that MYC2, MYC3, and MYC4 function redundantly to activate JAinduced leaf senescence. MYC2 binds to and activates the promoter of its target gene SAG29 (SENESCENCE-ASSOCIATED GENE29) to activate JA-induced leaf senescence. Interestingly, plants have evolved an elaborate feedback regulation mechanism to modulate JA-induced leaf senescence: The bHLH subgroup IIId factors (bHLH03, bHLH13, bHLH14, and bHLH17) bind to the promoter of SAG29 and repress its expression to attenuate MYC2/MYC3/MYC4-activated JA-induced leaf senescence. The antagonistic regulation by activators and repressors would mediate JA-induced leaf senescence at proper level suitable for plant survival in fluctuating environmental conditions.

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“…Members of DELLA protein family play a role in different processes of plant life, such as development of chloroplasts, fruits, leaves and senescence (Chen et al 2014;Gallego-Giraldo et al 2014). RGL2 takes part in the dormancy maintenance as a key negative controller of seed germination (Lee et al 2002), but it is also involved in floral development, in cooperation with RGA and RGL1 (Cheng et al 2004;Tyler et al 2004).…”

Section: Quantitative Changes In Rgl2 Concentrationmentioning

confidence: 99%

Signalling regulators of abscisic and gibberellic acid pathways are involved in dormancy breaking of Norway maple (Acer platanoides L.) seeds

2017

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Physiological dormancy is a characteristic of the seeds of plants that are exposed to adverse harsh environmental conditions. Many tree seeds from the northern hemisphere have acquired deep dormancy as an adaptation to the winter period. Such kinds of dormancy can be removed by cold stratification. This physiological process is regulated through abscisic and gibberellic acids signal transduction, in which ABI5, 14-3-3 and RGL2 have a negative response to cold stratification and cause dormancy breaking. Our study is, to our knowledge, the first to report tissue localisation of ABI5 and RGL2 in deeply physiologically dormant seeds. Localisation of these proteins differs in time (weeks of stratification) and space (anatomy of the embryo root). Studies showed that changes occurred on three levels: (1) tissue, as the fluorescence signal throughout the weeks of stratification was localised in different regions of the embryo axes, and these changes were associated with changes in development regulation of the individual regions; (2) cell, either in nucleus or in cytoplasm, involving regulation of gene expression, and synthesis and inactivation in cytoplasm; and (3) organelle, specifically in nuclei/nucleoli, indicating transcription regulation of the specific genes. At the end of stratification, when dormancy is broken, ABI5 and RGL2 were not noticeable in the cells of the apical meristem. ABI5 likely blocked germination through inhibition of meristem activity, whereas RGL2 through blocking of procambial cell differentiation. We speculate that similar molecular and cellular mechanisms exist among other seeds characterised by physiological dormancy.

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Removal of DELLA repression promotes leaf senescence in Arabidopsis

Cited by 55 publications

References 72 publications

MdbHLH93, an apple activator regulating leaf senescence, is regulated by ABA and MdBT2 in antagonistic ways

MdbHLH93, an apple activator regulating leaf senescence, is regulated by ABA and MdBT2 in antagonistic ways

Regulation of Jasmonate-Induced Leaf Senescence by Antagonism between bHLH Subgroup IIIe and IIId Factors in Arabidopsis

Signalling regulators of abscisic and gibberellic acid pathways are involved in dormancy breaking of Norway maple (Acer platanoides L.) seeds

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