Identification of Casparian Bands in the Mesocotyl and Lower Internodes of Rice (<i>Oryza sativa</i>L.) Seedlings Using Fluorescence Microscopy

Watanabe, Hajime; Saigusa, Masahiko; Morita, Shigenori

doi:10.1626/pps.9.390

Cited by 11 publications

(8 citation statements)

References 18 publications

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“…Vigorous seedling growth is crucial when rice seeds are sown in flooded paddy fields. For instance, the elongation of seedling organs, including mesocotyl, coleoptile, and first leaf, plays an important role in the emergence and establishment of direct seeded rice (Hoshikawa, 1993;Mori et al, 2012;Ogiwara & Terashima, 2001;Watanabe et al, 2015Watanabe et al, , 2007Watanabe et al, , 2006. Further, various physiological processes, including starch and sugar metabolism, are involved in the seedling growth of rice under flooded conditions (Ismail et al, 2009;Magneschi & Perata, 2009).…”

Section: Introductionmentioning

confidence: 99%

Effects of combinational treatment with ethephon and gibberellic acid on rice seedling growth and carbohydrate mobilization in seeds under ﬂooded conditions

Watanabe

Honma

Adachi

et al. 2018

Plant Production Science

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Early seedling growth, including seedling emergence and vigor, is crucial in direct seeded rice. In this study, we examined the effects of gibberellic acid (GA 3) and ethephon (ET) on the early growth of direct seeded rice, and on α-amylase activity and soluble sugar content in the seeds. Rice seeds were treated with water (control), ET, GA 3 , or ET+ GA 3 and were allowed to grow for 21 days. The results showed that ET and GA 3 synergistically improved the lengths of mesocotyl, coleoptile, mesocotyl+ coleoptile, and first leaf. Moderate synergistic effects of ET and GA 3 were detected in the second and third leaves. ET+ GA 3 treatment induced higher α-amylase activities during early post-germination growth, which is consistent with the longer coleoptile, mesocotyl, mesocotyl+ coleoptile, and first leaf. In addition, ET+ GA 3 induced higher α-amylase activity in the seeds, and consequently, higher sucrose and glucose concentrations than other treatments. These results partially explain the regulatory mechanism underlying the synergistic interaction of ET and GA 3 on rice seedling growth in terms of starch and sugar metabolism in the seeds, and this knowledge is expected to facilitate the practical use of ET and GA 3 in direct seeded rice systems.

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Section: Introductionmentioning

confidence: 99%

Effects of combinational treatment with ethephon and gibberellic acid on rice seedling growth and carbohydrate mobilization in seeds under ﬂooded conditions

Watanabe

Honma

Adachi

et al. 2018

Plant Production Science

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“…Root cap cells may function in Na + exclusion under salinity stress. In rice roots, the Casparian band also functions as a barrier to water and ion movement through the apoplast (Morita et al, 1996;Ranathunge et al, 2005;Watanabe et al, 2006). However, the root function in Na + exclusion has not been studied in detail.…”

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confidence: 99%

Differential Sensitivity of Rice Cultivars to Salinity and Its Relation to Ion Accumulation and Root Tip Structure

Ferdose

Kawasaki

Taniguchi

et al. 2009

Plant Production Science

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: Effects of NaCl on the growth, ion content, root cap structure and Casparian band development were examined in four rice (Oryza sativa L.) cultivars with different salt resistance (salt-sensitive indica-type IR 24 and japonica-type Nipponbare and salt-resistant indica-type Nona Bokra and Pokkali). Experiments were conducted to find the differences in salinity resistance during early seedling and developed seedling stages among the cultivars. For salinity treatment, sodium chloride (NaCl) was added to nutrient solution at concentrations of 0, 25 and 50 mM for 7 days from germination to the 7th day (early seedling stage) or from the 7th day to 14th day (developed seedling stage). Growth inhibition by salinity was more prominent in the early seedling stage than in the developed seedling stage. Based on the growth, the order of the sensitivity was IR24 > Nipponbare > Nona Bokra > Pokkali. The growth of NaCl-treated rice cultivars relative to control was significantly and negatively correlated with the Na + content and Na + /K + ratio in roots and shoots in both stages. Scanning electron microscopic observation revealed that the root cap tissues proliferated and extended to the basal part of the root tip by salinity. The length of root cap was, however, reduced by 50 mM NaCl in sensitive cultivars due to peeling off. An endodermal Casparian band was formed in the basal region of the root tip. Development of the Casparian band was more prominent in sensitive cultivars than in tolerant cultivars. Root cap proliferation might be related to NaCl resistance in rice seedlings, but the Casparian band may not function efficiently in Na + exclusion. Essentially the present results suggest that exclusion of Na + from roots plays a critical role in expression of Na + resistance in rice seedlings and the root cap is important for Na + exclusion.

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“…In the relaxation process, while the tensile deformation staying unchanged, the rice seedling stem strain could be divided into three stress components, including stress in the elastic body σ m0 , the stress in FMB σ m1 , and stress in SMB σ m2 . Hence, Equation 4could be rewritten as: σ t = σ m0 + σ m1 + σ m2 (6) where, σ m0 = ε 0 E m0 , σ m1 = ε 0 E m1 e -t/T m1 , σ m2 = ε 0 E m2 e -t/T m2 . When t =0 s and t =1200 s, relaxation stress was defined as zero-time stress and final stress, respectively, and their components at different stress levels were as showed in Table 6 and Table 7.…”

Section: Relationship Between Stress Components and Strain Levelsmentioning

confidence: 99%

“…When the proposed two-degree-of-freedom manipulator type transplanter working in the field [5] , rice seedlings were pulled up from the cell tray with clamp-shaped grippers. Rice seedling stem is a kind of biological material and agricultural fiber material with vascular bundle structure [6] , composed of cellulose, lignin, hemicellulose and other macromolecules [7,8] . It is a known fact that macromolecules would slip between each other when the biological material sample loaded with constant stress or strain [9] , causing certain damage to the biological material.…”

Section: Introduction mentioning

confidence: 99%

Effects of test levels on creep and relaxation characteristic parameters of stem for rice seedlings grown in plastic cell tray

Xiao

2020

International Journal of Agricultural and Biological Engineering

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Creep and relaxation characteristics of stem for rice seedlings grown in plastic cell tray were studied by static tensile testing, in order to determine the relationship between characteristic parameters (rheological model parameters, stress components and strain components) and test levels (stress levels and strain levels). Rice seedling stem specimen used in the test was 40 mm in length. And the applied test values for the creep and relaxation test ranged from 1.0-3.0 MPa and 1.5%-3.5%, respectively, each for 5 levels. The results indicated that elastic modulus in the creep and relaxation model was not affected by test levels. However, except that viscosity coefficient η kv was a constant and η m1 decreased with the increase of test levels, other viscosity coefficient and rheological time nonlinearly increased as the test levels increased. And strain components in the creep model and stress components in the relaxation model significantly increased as the test levels increased.

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Identification of Casparian Bands in the Mesocotyl and Lower Internodes of Rice (Oryza sativaL.) Seedlings Using Fluorescence Microscopy

Cited by 11 publications

References 18 publications

Effects of combinational treatment with ethephon and gibberellic acid on rice seedling growth and carbohydrate mobilization in seeds under ﬂooded conditions

Effects of combinational treatment with ethephon and gibberellic acid on rice seedling growth and carbohydrate mobilization in seeds under ﬂooded conditions

Differential Sensitivity of Rice Cultivars to Salinity and Its Relation to Ion Accumulation and Root Tip Structure

Effects of test levels on creep and relaxation characteristic parameters of stem for rice seedlings grown in plastic cell tray

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