Avena fatua caryopsis dormancy release is associated with changes in KAR1 and ABA sensitivity as well as with ABA reduction in coleorhiza and radicle

Kępczyński, Jan; Wójcik, Agata; Dziurka, Michał

doi:10.1007/s00425-020-03562-4

Cited by 6 publications

(4 citation statements)

References 38 publications

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“…Furthermore, it was observed that ABA catabolism is rapid enough to play an important role in the regulation of ABA accumulation as studied in the maize plants ( Ren et al, 2007 ). Again in the case of cereals, investigation in barley coleorhiza proved that the ABA 8 ′- hydroxylase gene plays a significant role in seed dormancy release ( Kępczyński et al, 2021 ).…”

Section: Role Of Abscisic Acid In Seed Developmentmentioning

confidence: 99%

Abscisic Acid: Role in Fruit Development and Ripening

Gupta¹,

Wani

Razzaq

et al. 2022

Front. Plant Sci.

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Abscisic acid (ABA) is a plant growth regulator known for its functions, especially in seed maturation, seed dormancy, adaptive responses to biotic and abiotic stresses, and leaf and bud abscission. ABA activity is governed by multiple regulatory pathways that control ABA biosynthesis, signal transduction, and transport. The transport of the ABA signaling molecule occurs from the shoot (site of synthesis) to the fruit (site of action), where ABA receptors decode information as fruit maturation begins and is significantly promoted. The maximum amount of ABA is exported by the phloem from developing fruits during seed formation and initiation of fruit expansion. In the later stages of fruit ripening, ABA export from the phloem decreases significantly, leading to an accumulation of ABA in ripening fruit. Fruit growth, ripening, and senescence are under the control of ABA, and the mechanisms governing these processes are still unfolding. During the fruit ripening phase, interactions between ABA and ethylene are found in both climacteric and non-climacteric fruits. It is clear that ABA regulates ethylene biosynthesis and signaling during fruit ripening, but the molecular mechanism controlling the interaction between ABA and ethylene has not yet been discovered. The effects of ABA and ethylene on fruit ripening are synergistic, and the interaction of ABA with other plant hormones is an essential determinant of fruit growth and ripening. Reaction and biosynthetic mechanisms, signal transduction, and recognition of ABA receptors in fruits need to be elucidated by a more thorough study to understand the role of ABA in fruit ripening. Genetic modifications of ABA signaling can be used in commercial applications to increase fruit yield and quality. This review discusses the mechanism of ABA biosynthesis, its translocation, and signaling pathways, as well as the recent findings on ABA function in fruit development and ripening.

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Section: Role Of Abscisic Acid In Seed Developmentmentioning

confidence: 99%

Abscisic Acid: Role in Fruit Development and Ripening

Gupta¹,

Wani

Razzaq

et al. 2022

Front. Plant Sci.

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“…Recently, it has been also postulated that that the coleorhiza-enforced dormancy in caryopses of A. fatua (Holloway et al 2020 ). After-ripening, also KAR 1 decreased the ABA content in the coleorhiza before germination was completed (Kępczyński et al 2021 ). ABA inhibited radicle emergence after-ripened caryopses A. fatua more strongly than coleorhiza emergence (Holloway et al 2020 ; Kępczyński et al 2021 ).…”

Section: Discussionmentioning

confidence: 99%

“…NO, an uncharged, gaseous lipophilic free radical can regulate seed dormancy and germination in several dicot plant species (Bethke et al 2007 ; Arc et al 2013 ; Matilla et al 2015 ; Singorelli and Considine 2018; Kumar et al 2021 ). Various NO donors, such as sodium nitroprusside (SNP), S-nitroso- N -acetylpenicillamine (SNAP), S-nitrosoglutathione (GSNO) or acidified KNO 2 were found to promote dormancy release in apple (Gniazdowska et al 2007 ), Arabidopsis (Bethke et al 2004 ), lettuce (Belgini and Lamattina 2000 ) and redroot pigweed (Kępczyński and Sznigir 2014 ) seeds. Thus, different NO donors have often been used in experiments with seeds of various plant species, aimed at elucidating the role of NO.…”

Section: Introductionmentioning

confidence: 99%

NO-mediated dormancy release of Avena fatua caryopses is associated with decrease in abscisic acid sensitivity, content and ABA/GAs ratios

Kępczyński

Wójcik

Dziurka

2023

Planta

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Main conclusion NO releases caryopsis dormancy in Avena fatua, the effect being dependent on the level of dormancy. The NO effect involves also the reduction of caryopsis sensitivity to ABA and to a decrease in the ABA to GAs ratio due to a decrease in ABA levels and the lack of effect on GAs levels before germination is completed. Abstract Nitric oxide (NO) from various donors (i.e. SNP, GSNO and acidified KNO2), applied to dry caryopses or during initial germination, released primary dormancy in caryopses. Dormancy in caryopses was gradually lost during dry storage (after-ripening) at 25 °C, enabling germination at 20 °C in the dark. The after-ripening effect is associated with a decrease in NO required for germination. In addition, NO decreased the sensitivity of dormant caryopses to exogenous abscisic acid (ABA) and decreased the embryos’ ABA content before germination was completed. However, NO did not affect the content of bioactive gibberellins (GAs) from non-13-hydroxylation (GA4, GA7) and 13-hydroxylation (GA1, GA3, GA6.) pathways. Paclobutrazol (PAC), commonly regarded as a GAs biosynthesis inhibitor, counteracted the dormancy-releasing effect of NO and did not affect the GAs level; however, it increased the ABA content in embryos before germination was completed. Ascorbic acid, sodium benzoate and tiron, scavengers of reactive oxygen species (ROS), reduced the stimulatory effect of NO on caryopsis germination. This work provides new insight on the participation of NO in releasing A. fatua caryopses dormancy and on the relationship of NO with endogenous ABA and GAs.

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“…Accordingly, the following methods have been identified as being effective techniques for overcoming dormancy in wild oat seeds. Methods that overcome PD dormancy include altering temperature and photoperiod regimes for germination (Somody et al 1984), adjusting the osmotic potential of the seed and light conditions (Boyd and Van Acker 2004), exposing the seed to ammonia gas (Cairns and De Villiers 1986), presoaking the seed in potassium nitrate solution (Hilton 1985), application of sodium hypochlorite and hydrogen peroxide in combination with GA; (Hsiao and Quick 1984), application of a variety of soluble sugars and GA (Foley 1992), as well as other reagents (Beckie et al 2012;Kępczyński et al 2021;Saini et al 1986). Methods that overcome PY dormancy include exposure of the seed to high-pressure gas (Hoffmann 1961), manual removal of lemma and palea (Kommedahl et al 1958), seed dipping in diluted sulfuric acid, and cold stratification treatment (Shahvand et al 2015).…”

Section: Introductionmentioning

confidence: 99%

Mechanical scarification technique breaks seed coat-mediated dormancy in wild oat (Avena fatua)

et al. 2021

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Wild oat is a herbicide resistance-prone global weed species that causes significant economic losses in dryland and horticultural agriculture. As a result, there has been a significant research effort in controlling this species. A major impediment to this research is the seed coat-mediated dormancy of wild oat, requiring a labor-intensive incision or puncturing of the seed coat to initiate seed germination. This study defines the most efficient settings of a mechanical thresher to overcome wild oat seed dormancy and then validates these settings using multiple populations collected from the Western Australian grain belt. We also compare the effects of rapid mechanical scarification and known germination stimulus tactics such as scarification with sulfuric acid (H2SO4), partial endosperm removal, sandpaper scarification of the seed coat, and immersion in sodium nitroprusside (NO donor SNP) solution on wild oat seedling growth rate. Threshing treatment of 1,500 rpm for 5 s provides equivalent germination compared with manually puncturing individual wild oat seeds, with no difference in seedling relative growth rate. The mechanical scarification of seeds using the thresher resulted in greater germination (66%) than H2SO4 scarification (0%), partial endosperm removal (10%), sandpaper seed coat scarification (25%), and exposure to NO donor SNP (34%). This study demonstrates that the physical dormancy of wild oat can be rapidly overcome using a commercially available mechanical thresher.

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Avena fatua caryopsis dormancy release is associated with changes in KAR1 and ABA sensitivity as well as with ABA reduction in coleorhiza and radicle

Cited by 6 publications

References 38 publications

Abscisic Acid: Role in Fruit Development and Ripening

Abscisic Acid: Role in Fruit Development and Ripening

NO-mediated dormancy release of Avena fatua caryopses is associated with decrease in abscisic acid sensitivity, content and ABA/GAs ratios

Mechanical scarification technique breaks seed coat-mediated dormancy in wild oat (Avena fatua)

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