Rhythmic Leaf Movements: Physiological and Molecular Aspects

Moran, Nava

doi:10.1007/978-3-319-20517-5_4

Cited by 13 publications

(7 citation statements)

References 133 publications

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“…Using Samanea saman (Jacq.) Merr., the model plant for studying nyctinasty due to its relatively large plant size, tissue-level mechanisms of nyctinastic leaf movement is well described [2,5,6]. In S. saman, nyctinastic leaf movement is triggered by specialized motor organs, pulvini, at the base of the compound leaves (secondary pulvini) or leaflets (tertiary pul-vini; Figure 1B).…”

Section: Introductionmentioning

confidence: 99%

Ion Channels Regulate Nyctinastic Leaf Opening in Samanea saman

et al. 2018

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The circadian leaf opening and closing (nyctinasty) of Fabaceae has attracted scientists' attention since the era of Charles Darwin. Nyctinastic movement is triggered by the alternate swelling and shrinking of motor cells at the base of the leaf. This, in turn, is facilitated by changing osmotic pressures brought about by ion flow through anion and potassium ion channels. However, key regulatory ion channels and molecular mechanisms remain largely unknown. Here, we identify three key ion channels in mimosoid tree Samanea saman: the slow-type anion channels, SsSLAH1 and SsSLAH3, and the Shaker-type potassium channel, SPORK2. We show that cell-specific circadian expression of SsSLAH1 plays a key role in nyctinastic leaf opening. In addition, SsSLAH1 co-expressed with SsSLAH3 in flexor (abaxial) motor cells promoted leaf opening. We confirm the importance of SLAH1 in leaf movement using SLAH1-impaired Glycine max. Identification of this "master player" advances our molecular understanding of nyctinasty.

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Section: Introductionmentioning

confidence: 99%

Ion Channels Regulate Nyctinastic Leaf Opening in Samanea saman

et al. 2018

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“…However, leguminous plants like soybean have a specialized leaf motor organ, the pulvinus, to regulate reversible changes in leaf position. Opposing volume changes resulting from ion and water fluxes in the opposite parts of the pulvinus drive reversible leaf movement without requiring growth (51). Isolated bean pulvinus protoplasts could maintain their rhythmic swelling under continuous light for more than 8 d (52).…”

Section: Discussionmentioning

confidence: 99%

“…Isolated bean pulvinus protoplasts could maintain their rhythmic swelling under continuous light for more than 8 d (52). Therefore, while the circadian regulation of growth is likely to be the main contributor to the rhythmic leaf movement of Arabidopsis , the circadian regulation of pumps, carriers, ion, and water channels in the pulvinus is probably the key driving force in soybean (51, 52). Alkaline stress is likely to affect the ion flux through its direct impact on pH and mild drought may significantly influence the water flux, thus perturbing the rhythmic swelling of the pulvinus.…”

Section: Discussionmentioning

confidence: 99%

Comprehensive mapping of abiotic stress inputs into the soybean circadian clock

Cao

Mwimba

et al. 2019

Proc. Natl. Acad. Sci. U.S.A.

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SignificanceThe effects of diverse environmental factors on the crop circadian clock have not been systemically studied. We devised a reliable and cost-effective discovery pipeline and demonstrated its feasibility by mapping the abiotic stress “inputome” of the soybean clock. We found that the interfaces between the soybean clock and abiotic stress signals were quite different from those in Arabidopsis. Furthermore, alkaline stress was identified as a circadian clock modulator. These findings highlight the complexity of the soybean clock, which cannot be simply extrapolated from knowledge obtained from Arabidopsis. Our discovery pipeline thus offers a broadly applicable and affordable tool for similar large-scale circadian clock studies in diverse species since it does not rely on transgenic circadian reporters or expensive imaging systems.

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“…a), Satter et al . () and Moran (, ) determined nyctinasty to be caused by an asymmetric swelling/shrinking of extensor motor cells (adaxial side) and flexor motor cells (abaxial side) located in the base of the leaves (3 rd pulvini) (Fig. b), controlled by turgor change.…”

Section: Previous Efforts To Uncover the Mechanism Of Nyctinastymentioning

confidence: 99%

Plant nyctinasty – who will decode the ‘Rosetta Stone’?

2019

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Summary Nyctinasty is the circadian rhythmic nastic movement of leguminous plants in response to the onset of darkness, a unique and intriguing phenomenon that has attracted attention for centuries. The movement itself is caused by the asymmetric volume change of motor cells between the adaxial and abaxial sides of the leaflet. Recently, we identified the ion channels responsible for the volume change of motor cells during the leaf‐opening process of Samanea saman; the asymmetric expression of SsSLAH1, which is under the control of SsCCA1, was found to play a key role in this process. Here, we summarize the history of the study of nyctinasty, our current results and several insights for further study.

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Rhythmic Leaf Movements: Physiological and Molecular Aspects

Cited by 13 publications

References 133 publications

Ion Channels Regulate Nyctinastic Leaf Opening in Samanea saman

Ion Channels Regulate Nyctinastic Leaf Opening in Samanea saman

Comprehensive mapping of abiotic stress inputs into the soybean circadian clock

Plant nyctinasty – who will decode the ‘Rosetta Stone’?

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