Aerenchyma formation and methane and oxygen exchange in rice

Journal Article · · Soil Science Society of America Journal; (United States)

DOI:https://doi.org/10.2136/sssaj1993.03615995005700020017x· OSTI ID:6158040

Kludze, H K; DeLaune, R D; Patrick, Jr, W H ^[1]

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1. Louisiana State Univ., Baton Rouge (United States)

Limited information exists on the direct link between the intensity of soil reduction or anaerobiosis and gas exchange in rice (Oryza sativa L.). A laboratory experiment was conducted to determine the extent to which specific levels of soil redox potential (Eh) could influence aerenchyma formation. O[sub 2] transport, and CH[sub 4] production and emission. Plants were grown in a Crowley silt loam (fine, montmorillonitic, thermic Typic Albaqualf) under controlled Eh values of 200, -200, and [minus]300 mV. Radial O[sub 2] loss (ROL) from plant roots was estimated colorimetrically by using Ti[sup 3+]-citrate solution, a reduced compound. Methane production and its emission increased with decrease in soil Eh; CH[sub 4] production increased 10-fold while its emission was enhanced 17-fold when soil Eh dropped from [minus]200 to [minus]300 mV. A positive relationship was established between the intensity of soil anaerobiosis and both aerenchyma formation and ROL. Root and shoot dry weights and root length decreased with decrease in soil Eh. Results of this study demonstrate that soil Eh influences net CH[sub 4] flux from rice in two ways: (i) it directly determines the amount and rate of CH[sub 4] production in the soil, and (ii) it initiates morphological and physiological changes in the rice plant that affect gas exchange between the soil and the atmosphere. Although the results may not necessarily reflect actual conditions in the field, they provide a theoretical basis for understanding the influence of soil Eh on rice growth, CH[sub 4] production, and gas exchange. 36 refs., 6 figs., 2 tabs.

• DOE Contract Number: FC03-90ER61010
• OSTI ID: 6158040
• Journal Information: Soil Science Society of America Journal; (United States), Journal Name: Soil Science Society of America Journal; (United States) Vol. 57:2; ISSN 0361-5995; ISSN SSSJD4
• Country of Publication: United States
• Language: English

Related Subjects

09 BIOMASS FUELS
090800* -- Biomass Fuels-- Production-- (1990-)
095000 -- Biomass Fuels-- Environmental Aspects-- (1990-)
AGRICULTURE
ALKANES
BIOSYNTHESIS
CLIMATIC CHANGE
DATA
ELEMENTS
EXPERIMENTAL DATA
GREENHOUSE EFFECT
HYDROCARBONS
INFORMATION
LOAM
METHANE
NONMETALS
NUMERICAL DATA
ORGANIC COMPOUNDS
OXYGEN
REDOX POTENTIAL
SOILS
SYNTHESIS