Growth promotion and an increase in cell wall extensibility by silicon in rice and some other Poaceae seedlings

Hossain, Mohammad Talim; Mori, Ryuji; Soga, Kouichi; Wakabayashi, Kazuyuki; Kamisaka, Seiichiro; Fujii, Shuhei; Yamamoto, Ryōichi; Hoson, Takayuki

doi:10.1007/s102650200004

Cited by 128 publications

(85 citation statements)

References 22 publications

(30 reference statements)

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“…It demonstrates that Si promote one of all three events in cell growth and development, i.e., cell elongation. The other two stages are cell division and differentiation (HOSSAIN et al, 2002b). It is already known that Si decreases cell wall thickness in leaves, by increasing its extensibility and thus general growth (HOSSAIN et al, 2002a); therefore, it is plausible to state that this may also be effective other plant organs.…”

Section: Resultsmentioning

confidence: 97%

Silicon leaf application and physiological quality of white oat and wheat seeds

Toledo

Castro²,

Crusciol

et al. 2012

Sem. Ci. Agr.

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Plant nutrition can positively influence quality of seeds by improving plant tolerance to adverse climate. In this context, silicon is currently considered a micronutrient and it is beneficial to plant growth, especially Poaceaes such as white oat and wheat, thereby improving physiological quality of seeds. This study had the objective of evaluating the effects of silicon leaf application on plant tillering, silicon levels and physiological quality of white oat and wheat seeds besides establishing correlations between them. Two experiments were carried out in winter with white oat and wheat. The experimental design was the completely randomized block with eight replications. Treatments consisted of foliar application of silicon (0.8% of soluble silicon, as stabilized orthosilicic acid) and a control (with no application). Silicon levels in leaves were determined at flowering whereas the number of plants and panicles/spikes per area was counted right before harvest. Seed quality was evaluated right after harvest through mass, germination and vigor tests. Data was submitted to variance analysis and means were compared by the Tukey test at a probability level of 5%. Person's linear correlation test was performed among silicon level in plants, tillering and seed quality data. Silicon leaf application increases root and total length of white oat seedlings as an effect of higher Si level in leaves. Silicon leaf application increases mass of wheat seeds without affecting germination or vigor. Key words: Avena sativa L., Triticum aestivum L., germination, vigor, plant nutrition, orthosilicic acid ResumoA nutrição das plantas pode influenciar positivamente a qualidade das sementes por proporcionar maior tolerância às adversidades climáticas. Neste contexto, o silício é atualmente considerado um micronutriente e tem efeito benéfico no crescimento das plantas, especialmente Poaceaes como aveia-branca e trigo, consequentemente melhorando a qualidade fisiológica das sementes. Este estudo objetivou avaliar os efeitos da aplicação foliar de silício no perfilhamento e teor do nutriente nas plantas e na qualidade fisiológica das sementes de aveia-branca e trigo além de estabelecer correlações entre os fatores. Foram realizados dois experimentos conduzidos no inverno com as culturas da aveia-branca e do trigo. O delineamento experimental foi o de blocos ao acaso, com oito repetições. Os tratamentos constaram da aplicação foliar de silício (0,8% de silício solúvel, aplicado na forma de ácido ortosilícico estabilizado) e uma testemunha (sem aplicação). O teor de silício nas folhas foi determinado no florescimento; já a avaliação do perfilhamento, o número de plantas e de panículas/espigas por área foi determinado anteriormente à colheita. A qualidade das sementes foi avaliada logo após a colheita por meio de testes de massa, germinação e vigor. Os dados foram submetidos à análise de variância e as médias comparadas pelo teste de Tukey a 5% de probabilidade. O teste de correlação linear de Person foi aplicado a fim de relac...

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Section: Resultsmentioning

confidence: 97%

Silicon leaf application and physiological quality of white oat and wheat seeds

Toledo

Castro²,

Crusciol

et al. 2012

Sem. Ci. Agr.

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“…In the case of leaves (Hossain et al 2002), silicon application to rice promoted the elongation of leaf blades with a concomitant increase in cell-wall extensibility in its basal elongating zone. Silicon plays two separate functions in root cell walls, strengthening the endodermal cell walls in the mature basal region and keeping the young expanding cell walls extensible in the apical region of the roots (Hattori et al 2003).…”

Section: Discussionmentioning

confidence: 99%

Study of silicon effects on antioxidant enzyme activities and osmotic adjustment of wheat under drought stress

Ahmad¹,

Haddad²

2011

Czech J. Genet. Plant Breed.

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Abstract:The effect of silicon (Si) was investigated on the major antioxidant enzyme activities including superoxide dismutase (SOD), catalase (CAT), ascorbate peroxidase (APX), peroxidase (POD), relative water content (RWC), chlorophyll and soluble protein contents, proline (Pro) and glycine betaine (GB) accumulation in three different growth stages (2 nd , 4 th leaf and tillering stages) of wheat (Triticum aestivum L.) plants under drought stress. The experiment was performed in a completely randomized design for three treatments including control, drought and Si-drought (2mM silicate sodium/kg) with three replications in a greenhouse. The results indicated that Si partially offset the negative impacts of drought stress increasing the tolerance of wheat by rising Pro and GB accumulation and soluble protein content. Compared with the plants treated with drought, applied Si significantly enhanced the activities of SOD, CAT, APX and POD. In contrast, drought stress caused a considerable decrease in RWC, chlorophyll and soluble protein contents. This Si effect was time-dependent and became stronger in the tillering stage. The results of the present experiment coincided with the conclusion that Si alleviates water deficit of wheat by preventing the oxidative membrane damage and may be associated with plant osmotic adjustment.

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“…Rice seedlings were grown on agar containing 0 (control) or 5 mM concentration of silicic acid, because 5 mM concentration of silicic acid was the most effective for rice growth 8 . Cell wall materials were prepared from the rice seedlings containing coleoptiles, first, second, and third leaves as AIR.…”

Section: Resultsmentioning

confidence: 99%

Aqueous Macromolecules with Silicon from Alcoholinsoluble Residues of Rice Seedlings

Ishii

Matsunaga

2008

JARQ

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Rice (Oryza sativa) seedlings were grown in the presence of 5 mM orthosilicic acid (H 4 SiO 4 , IUPAC name: tetrahydroxyl silane). More than 80% of silicon absorbed in the rice was localized in the alcoholinsoluble residues (AIR) fractions. AIR refers to cell wall materials in the text. Driselase (commercial cell wall hydrolyzing enzyme preparation) released 3% of silicon present in the rice AIR into water-soluble fractions. Size-exclusion high performance liquid chromatography/inductively coupled plasma atomic emission spectroscopy (HPLC/ICP-AES) showed that an aqueous silicon-containing substance with high molecular weight was present in the water-soluble fractions. The compounds were stable at pH 6.5, while commercial silica sols which were stable at pH 9.0 were insoluble at the neutral pH. The stability in neutral pH may be due to the presence of a complex of polysaccharide and protein in the molecule. These results imply that silica-containing macromolecules exist in rice cell walls.Discipline: Soil, fertilizer and plant nutrition Additional key words: cell walls, HPLC/ICP-AES, Oryza sativa, silicon JARQ 42 (3), 181 -186 (2008)

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Growth promotion and an increase in cell wall extensibility by silicon in rice and some other Poaceae seedlings

Cited by 128 publications

References 22 publications

Silicon leaf application and physiological quality of white oat and wheat seeds

Silicon leaf application and physiological quality of white oat and wheat seeds

Study of silicon effects on antioxidant enzyme activities and osmotic adjustment of wheat under drought stress

Aqueous Macromolecules with Silicon from Alcoholinsoluble Residues of Rice Seedlings

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