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ARS Home » Southeast Area » Stuttgart, Arkansas » Harry K. Dupree Stuttgart National Aquaculture Research Cntr » Research » Publications at this Location » Publication #153242
Title: USE OF THE RICE GROWTH STAGING SYSTEM TO UNDERSTAND TIMING OF SILICA UPTAKE AND OTHER PHENOMENON.

Author
item COUNCE, PAUL - UA RICE RESEARCH
item BRYANT, ROLFE - 6225-05-00
item Mitchell, Andrew
item KEISLING, TERRY - US RICE RESEARCH

Submitted to: Temperate Rice Conference Proceedings
Publication Type: Abstract Only
Publication Acceptance Date: 3/10/2003
Publication Date: 3/10/2003
Citation: COUNCE, P., BRYANT, R., MITCHELL, A.J., KEISLING, T. USE OF THE RICE GROWTH STAGING SYSTEM TO UNDERSTAND TIMING OF SILICA UPTAKE AND OTHER PHENOMENON. TEMPERATE RICE CONFERENCE PROCEEDINGS. 2003. p.143.

Interpretive Summary:

Technical Abstract: The rice growth staging system has been developed to help standardize the definition therefore the understanding of rice growth stages. The basis of the system is the presence of objective morphological markers for determining the stage of development for a rice plant. Since silica deposition is important to both disease and insect resistance, we sought to better understand the stage of development for silica deposition. Seedling development consists of four growth stages: umimbibed seed (SO), radicle and coleoptile emergence (S1,S2), and prophyll emergence from the coleoptile (S3). Vegetative development consists of stages V1, V2'VN; N being equal to the final number of leaves with collars on the main stem. Reproductive development consists of 10 growth stages based on discrete morphological criteria: panicle initiation (R0), panicle branch differentiation (R1), flag leaf collar formation (R2), panicle exertion (R3), anthesis (R4), grain length and width expansion (R5), grain depth expansion (R6), yellow grain (R7), brown grain (R8), and all grains which reached R5 have reached R8 (R9). Growth stages R4-R8 are indicated when one grain on a main stem panicle has reached the indicator grain stage (that is for a plant with only one grain at anthesis(R4) and all other grains earlier, the growth stage would be R4). Individual panicles were harvested at various growth stages, and individual grains were divided into their indicator grain classes R3-R8. We measured silica contents of rice seeds over a range of rice growth stages and found silica deposition to be occurring primarily between R3 and R4 and between R6 and R7 growth stages. Silica was deposited in the hull of rice grains during growth stages R3, R4, and R6 and R7. The rice growth staging system can be used to experimentally elucidate these and other topics of rice research.