Effects of Strigolactones on Grain Yield and Seed Development in Rice

Yamada, Y.; Otake, Mami; Furukawa, Takashi; Shindo, Masato; Shimomura, Koichiro; Yamaguchi, Shinjiro; Umehara, Mikihisa

doi:10.1007/s00344-018-9887-7

Cited by 17 publications

(15 citation statements)

References 53 publications

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“…As highlighted in the introduction, SLs have been demonstrated to affect stomatal closure with different outcomes in monocots and dicots. While data in dicots largely support the hypothesis that SLs promote stomatal closure in ABA-dependent and independent ways [ 13 , 15 ] and excess SLs leads to better performances under stress also via higher sensitivity to ABA [ 4 , 23 ], a different pattern has been suggested in monocots. In rice leaves for example, ABA synthesis appears to be repressed by endogenous SLs, and stomatal limitation is decreased under osmotic stress in response to GR24 [ 9 ].…”

Section: Resultsmentioning

confidence: 99%

“…Since 2008, they have been recognized as a family of phytohormones, for which the first assigned endogenous role was in the inhibition of shoot branching/tillering (for a comprehensive review, see [ 1 ]). Since then, many additional effects have been added, such as the promotion of secondary shoot growth and leaf senescence, the inhibition of adventitious rooting [ 2 ] or the stimulation of lateral root density and epidermal cell length [ 3 ], as well as crop yield and seed quality [ 4 ]. Furthermore, it is now becoming apparent that SLs contribute to long-term survival in various harsh environmental conditions [ 5 ].…”

Section: Introductionmentioning

confidence: 99%

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The Potential of the Synthetic Strigolactone Analogue GR24 for the Maintenance of Photosynthesis and Yield in Winter Wheat under Drought: Investigations on the Mechanisms of Action and Delivery Modes

Sedaghat

Emam

Mokhtassi‐Bidgoli

et al. 2021

Plants

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Strigolactones (SLs) have been implicated in many plant biological and physiological processes, including the responses to abiotic stresses such as drought, in concert with other phytohormones. While it is now clear that exogenous SLs may help plants to survive in harsh environmental condition, the best, most effective protocols for treatment have not been defined yet, and the mechanisms of action are far from being fully understood. In the set of experiments reported here, we contrasted two application methods for treatment with a synthetic analog of SL, GR24. A number of morphometric, physiological and biochemical parameters were measured following foliar application of GR24 or application in the residual irrigation water in winter wheat plants under irrigated and drought stress conditions. Depending on the concentration and the method of GR24 application, differentiated photosynthesis and transpiration rate, stomatal conductance, leaf water potential, antioxidant enzyme activities and yield in drought conditions were observed. We present evidence that different methods of GR24 application led to increased photosynthesis and yield under stress by a combination of drought tolerance and escape factors, which should be considered for future research exploring the potential of this new family of bioactive molecules for practical applications.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The Potential of the Synthetic Strigolactone Analogue GR24 for the Maintenance of Photosynthesis and Yield in Winter Wheat under Drought: Investigations on the Mechanisms of Action and Delivery Modes

Sedaghat

Emam

Mokhtassi‐Bidgoli

et al. 2021

Plants

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“…Besides branching development, SLs have been indicated to participate in a series of plant growth and development processes, including seed germination and development [ 47 , 48 ], stem elongation [ 49 ], leaf expansion [ 50 ], leaf senescence [ 51 ], drought and salinity responses [ 52 ], and nodule development [ 53 ]. In the present study, we also observed that MsD14 was primarily expressed in the roots, flowers, and seedpods ( Figure 1 , 2).…”

Section: Discussionmentioning

confidence: 99%

Silencing of MsD14 Resulted in Enhanced Forage Biomass through Increasing Shoot Branching in Alfalfa (Medicago sativa L.)

Wen

Liu

et al. 2022

Plants

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Branching is one of the key determinants of plant architecture that dramatically affects crop yield. As alfalfa is the most important forage crop, understanding the genetic basis of branching in this plant can facilitate breeding for a high biomass yield. In this study, we characterized the strigolactone receptor gene MsD14 in alfalfa and demonstrated that MsD14 was predominantly expressed in flowers, roots, and seedpods. Furthermore, we found that MsD14 expression could significantly respond to strigolactone in alfalfa seedlings, and its protein was located in the nucleus, cytoplasm, and cytomembrane. Most importantly, transformation assays demonstrated that silencing of MsD14 in alfalfa resulted in increased shoot branching and forage biomass. Significantly, MsD14 could physically interact with AtMAX2 and MsMAX2 in the presence of strigolactone, suggesting a similarity between MsD14 and AtD14. Together, our results revealed the conserved D14-MAX2 module in alfalfa branching regulation and provided candidate genes for alfalfa high-yield molecular breeding.

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“…More later, SLs were found as a class of phytohormones that inhibit shoot branching (Gomez-Roldan et al, 2008;Umehara et al, 2008). In this time, SLs are also known to control root architecture and promote leaf senescence, endosperm development, and secondary growth (Agusti et al, 2011;Kapulnik et al, 2011;Ruyter-Spira et al, 2011;Yamada et al, 2014;Ueda and Kusaba, 2015;Yamada et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

Strigolactones Decrease Leaf Angle in Response to Nutrient Deficiencies in Rice

et al. 2020

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Strigolactones (SLs) are a class of plant hormones that are synthesized from b-carotene through sequential reactions catalyzed by DWARF (D) 27, D17, D10, and OsMORE AXILLARY GROWTH (MAX) 1 in rice (Oryza sativa L.). In rice, endogenous SL levels increase in response to deficiency of nitrogen, phosphate, or sulfate (−N, −P, or −S). Rice SL mutants show increased lamina joint (LJ) angle as well as dwarfism, delayed leaf senescence, and enhanced shoot branching. The LJ angle is an important trait that determines plant architecture. To evaluate the effect of endogenous SLs on LJ angle in rice, we measured LJ angle and analyzed the expression of SL-biosynthesis genes under macronutrient deficiencies. In the "Shiokari" background, LJ angle was significantly larger in SL mutants than in the wild-type (WT). In WT and SL-biosynthesis mutants, direct treatment with the SL synthetic analog GR24 decreased the LJ angle. In WT, deficiency of N, P, or S, but not of K, Ca, Mg, or Fe decreased LJ angle. In SL mutants, deficiency of N, P, or S had no such effect. We analyzed the time course of SL-related gene expression in the LJ of WT deficient in N, P, or S, and found that expression of SL-biosynthesis genes increased 2 or 3 days after the onset of deficiency. Expression levels of both the SLbiosynthesis and signaling genes was particularly strongly increased under −P. Rice cultivars "Nipponbare", "Norin 8", and "Kasalath" had larger LJ angle than "Shiokari", interestingly with no significant differences between WT and SL mutants. In "Nipponbare", endogenous SL levels increased and the LJ angle was decreased under −N and −P. These results indicate that SL levels increased in response to nutrient deficiencies, and that elevated endogenous SLs might negatively regulate leaf angle in rice.

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Effects of Strigolactones on Grain Yield and Seed Development in Rice

Cited by 17 publications

References 53 publications

The Potential of the Synthetic Strigolactone Analogue GR24 for the Maintenance of Photosynthesis and Yield in Winter Wheat under Drought: Investigations on the Mechanisms of Action and Delivery Modes

The Potential of the Synthetic Strigolactone Analogue GR24 for the Maintenance of Photosynthesis and Yield in Winter Wheat under Drought: Investigations on the Mechanisms of Action and Delivery Modes

Silencing of MsD14 Resulted in Enhanced Forage Biomass through Increasing Shoot Branching in Alfalfa (Medicago sativa L.)

Strigolactones Decrease Leaf Angle in Response to Nutrient Deficiencies in Rice

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