Molecular Aspects of Seed Dormancy

Finkelstein, Ruth; Reeves, Wendy; Ariizumi, Tohru; Steber, Camille M.

doi:10.1146/annurev.arplant.59.032607.092740

Cited by 1,159 publications

(1,084 citation statements)

References 199 publications

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“…Moreover, HBL manage to overcome the Niinduced damage in terms of nodule nitrogen, carbohydrate and leghemoglobin content and activity of nitrate reductase and nitrogenase (Fig. 1a-e) that may be because of BR and ABA act antagonistically and co-regulate various developmental process related to nitrogen metabolism (Finkelstein et al 2008;Chan and Gresshoff 2009) and the expression of hundreds of genes (Nemhauser et al 2006).…”

Section: Discussionmentioning

confidence: 99%

Brassinosteroid-mediated evaluation of antioxidant system and nitrogen metabolism in two contrasting cultivars of Vigna radiata under different levels of nickel

Yusuf

Fariduddin

Ahmad

et al. 2014

Physiol Mol Biol Plants

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The role of 28-homobrassinolide (HBL) in countering nickel-induced oxidative damage through overexpression of antioxidant enzymes and proline in Vigna radiata has been investigated. Two varieties of V. radiata, one sensitive to Ni (PDM-139) and the other tolerant to Ni (T-44), were sown in the soil fed with different levels (0, 50, 100 or 150 mg kg −1 ) of Ni, and at 29-day stage, foliage of plants was applied with deionized water (control), 10 −8 or 10 −6 M of HBL. The plants were sampled at 45-day stage of growth to assess various physiological as well as biochemical characteristics. The remaining plants were allowed to grow up to maturity to study the yield characteristics. The growth traits, leghemoglobin, nitrogen and carbohydrate content in the nodules, leaf chlorophyll content, photosynthesis efficiency, leaf water potential, activities of nitrate reductase, carbonic anhydrase and nitrogenase decreased proportionately with the increasing concentrations of nickel, whereas electrolyte leakage, various antioxidant enzymes viz. catalase, peroxidase and superoxide dismutase and accumulation of proline increased at 45-day stage. However, the exogenously applied HBL to the nickel-stressed or non-stressed plants improved growth, nodulation and photosynthesis and further enhanced the various antioxidant enzymes viz. catalase, peroxidase and superoxide dismutase and accumulation of proline. The deleterious impact of Ni on the plants was concentration dependent where HBL applied to the foliage induced overexpression of antioxidant enzyme and accumulation of proline (osmolyte) which could have conferred tolerance to Ni up to 100 mg kg −1 , resulting in improved growth, nodulation, photosynthesis and yield attributes.

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Section: Discussionmentioning

confidence: 99%

Brassinosteroid-mediated evaluation of antioxidant system and nitrogen metabolism in two contrasting cultivars of Vigna radiata under different levels of nickel

Yusuf

Fariduddin

Ahmad

et al. 2014

Physiol Mol Biol Plants

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“…Germination of both seeds and spores involves complex signaling pathways (Finkelstein et al 2008;Setlow 2014) including O-phosphorylation (Arc et al 2011). It has been proposed (El-Maarouf-Bouteau et al 2013) that germination takes place when ROS levels are sufficient for signaling but before ROS damage occurs (Dębska et al 2013).…”

Section: Biological Insight Into Crosstalk Between Met Oxidation Andmentioning

confidence: 99%

Convergent signaling pathways—interaction between methionine oxidation and serine/threonine/tyrosine O-phosphorylation

Rao

Thelen

Miernyk

2015

Cell Stress and Chaperones

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Oxidation of methionine (Met) to Met sulfoxide (MetSO) is a frequently found reversible posttranslational modification. It has been presumed that the major functional role for oxidation-labile Met residues is to protect proteins/ cells from oxidative stress. However, Met oxidation has been established as a key mechanism for direct regulation of a wide range of protein functions and cellular processes. Furthermore, recent reports suggest an interaction between Met oxidation and O-phosphorylation. Such interactions are a potentially direct interface between redox sensing and signaling, and cellular protein kinase/phosphatase-based signaling. Herein, we describe the current state of Met oxidation research, provide some mechanistic insight into crosstalk between these two major posttranslational modifications, and consider the evolutionary significance and regulatory potential of this crosstalk.

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“…Abscisic acid (ABA) is an essential phytohormone that protects plants against biotic and abiotic stress [1][2][3][4]. Genetic and biochemical characterizations identified an ABA signaling pathway in Arabidopsis thaliana (A. thaliana) involving the ABA receptor PYR1/PYL/ RCAR family of proteins (hereafter referred to as PYLs for simplicity), the negative regulator Clade A protein phosphatases type 2C (PP2Cs), the positive player Class III SNF1-related protein kinases 2 (SnRK2s), SnRK2.2/2.3/2.6, and the ABA-responsive element binding factors (ABFs) ( Figure 1A) [5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Molecular basis for the selective and ABA-independent inhibition of PP2CA by PYL13

Wang

Sheng

et al. 2013

Cell Res

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PYR1/PYL/RCAR family proteins (PYLs) are well-characterized abscisic acid (ABA) receptors. Among the 14 PYL members in Arabidopsis thaliana, PYL13 is ABA irresponsive and its function has remained elusive. Here, we show that PYL13 selectively inhibits the phosphatase activity of PP2CA independent of ABA. The crystal structure of PYL13-PP2CA complex, which was determined at 2.4 Å resolution, elucidates the molecular basis for the specific recognition between PP2CA and PYL13. In addition to the canonical interactions between PYLs and PP2Cs, an extra interface is identified involving an element in the vicinity of a previously uncharacterized CCCH zinc-finger (ZF) motif in PP2CA. Sequence blast identified another 56 ZF-containing PP2Cs, all of which are from plants. The structure also reveals the molecular determinants for the ABA irresponsiveness of PYL13. Finally, biochemical analysis suggests that PYL13 may hetero-oligomerize with PYL10. These two PYLs antagonize each other in their respective ABA-independent inhibitions of PP2Cs. The biochemical and structural studies provide important insights into the function of PYL13 in the stress response of plant and set up a foundation for future biotechnological applications of PYL13.

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Molecular Aspects of Seed Dormancy

Cited by 1,159 publications

References 199 publications

Brassinosteroid-mediated evaluation of antioxidant system and nitrogen metabolism in two contrasting cultivars of Vigna radiata under different levels of nickel

Brassinosteroid-mediated evaluation of antioxidant system and nitrogen metabolism in two contrasting cultivars of Vigna radiata under different levels of nickel

Convergent signaling pathways—interaction between methionine oxidation and serine/threonine/tyrosine O-phosphorylation

Molecular basis for the selective and ABA-independent inhibition of PP2CA by PYL13

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