Silicon accumulation and distribution in rice under nutrient solution system

Name: Aunthicha Phommuangkhuk

LCSH: Kasetsart University -- Dissertations. Ph.D. (Agricultural Research and Development) 2020

Classification :.LCCS: SB191.R5

LCSH: Kasetsart University. -- Faculty of Agriculture at Kamphaeng Saen -- Dissertations

LCSH: Rice -- Silicon content

LCSH: Rice -- Growth

LCSH: Silicon in agriculture

Abstract: The application of Si fertilizer today is very common in many crop production systems worldwide, including Thailand. Over the last decades, Si fertilizer has become a focus of increasing interest in rice. Several evidences have indicated the beneficial effects of Si on rice yield, but in Thailand, findings about advantage of Si for rice production remains poorly understood. The experiment was conducted in order to study the distribution and accumulation of Si in rice. Five rates of Ca2SiO4 (0, 10, 50, 100 and 500 mgCa2SiO4 L -1 ) was applied in each pot under Asher’s nutrient solution. The design of this experiment is completely random (CRD) with three replications. The five rice samples were collected at five growth stages, i.e.: active tillering (45 DAS), panicle initiation (60 DAS), booting (80 DAS), flowering (100 DAS) and harvest stage, therefore fifteen sets of every treatments were prepared. The rice samples were collected at different growth stages for the determination of growth, yield, nutrient content, Si accumulation and distribution in plant. The result revealed that the application of Si in rice had significant effects on leaf, stem, root, panicle, petiole, husk and grain dry at matter at almost all growth stages. The highest dry matter was found when Ca2SiO4 was applied at the rate of 100 mg L-1 . Increasing level of Si up to 500 mgCa2SiO4 L -1 significantly greater total Si content, Si uptake, total N and K content in rice organs at almost all growth stages more than total P, Ca and Mg content. The percentages of Si distributions at the harvest stage of 500 mgCa2SiO4 L -1 were 25.43, 22.74, 21.77, 18.28, 8.63 and 3.15 percent in husk stem leaf petiole grain root, respectively. Besides, the application of Si in rice had significant effects on Si uptake in leaf, stem, petiole and husk at all growth stages. The percentage of Si uptake at the harvest stage of 500 mgCa2SiO4 L -1 were 33.19, 26.88, 25.68, 6.85, 4.85 and 2.54 percent in grain stem leaf root husk petiole, respectively. Scanning electron microscope with energy dispersive spectrometry revealed that Si in the leaf and stem were formed as a silica bodies in epidermal long cells along with the large and small veins. In the root, Si was distributed in epidermis, exodermis, scerenchyma and cortex. SEM image and EDS spectra for grain cross section showed the Si distribution in aleurone layer. The Si distribution was more prominent in trichome of guard cells and husk than in the cell wall.

Kasetsart University. Office of the University Library

Address: Bangkok

Email: tdckulib@ku.ac.th

Name: Suphachai Amkha

Role: Thesis Advisor

Name: Yongyuth Osotsapar

Role: Thesis CO-Advisor

Name: Nawarat Udomprasert

Role: Thesis CO-Advisor

Created: 2020

Modified: 2025-07-03

Issued: 2025-07-03

วิทยานิพนธ์/Thesis

application/pdf

URL: https://www.lib.ku.ac.th/KUthesis/2563/aunthicha-pho-all.pdf

CallNumber: SB191.R5 .A96

eng

DegreeName: Master of Science

Level: Master's Degree

Descipline: Agricultural Research and Development

Grantor: Kasetsart University

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