Gas-exchange properties of developing cotton fruit

Conference · Tue May 01 04:00:00 EDT 1990 · Plant Physiology, Supplement; (USA)

OSTI ID:5725259

Wullschleger, S D; Oosterhuis, D M ^[1]

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1. Univ. of Arkansas, Fayetteville (USA)

Field studies were conducted to document the photosynthetic and respiratory properties of cotton (Gossypium hirsutum L.) fruit during ontogeny. Dark respiration by the developing boll averaged {minus}18.7 {mu}mol per meter squared per second for the first six days after anthesis and gradually declined to less than 16% of this value after 40 days. Diurnal patterns of respiration were age dependent and closely correlated with stomatal conductance of the capsule wall. Stomata of young fruit were highly responsive to diurnal signals but lost this capacity with increasing age. Radio-labeled carbon dioxide injected into the fruit was rapidly assimilated by the outer capsule wall in the light, while fiber and seed fixed significant carbon-14 activity in both the light and dark. These data indicate that cotton fruit are sites of carbon dioxide evolution, but also serve a role in the reassimilation of carbon dioxide and thereby, function as important sources of assimilate for reproductive development.

• OSTI ID: 5725259
• Report Number(s): CONF-9007196--
• Conference Information: Journal Name: Plant Physiology, Supplement; (USA) Journal Volume: 93:1
• Country of Publication: United States
• Language: English

Related Subjects

54 ENVIRONMENTAL SCIENCES
540110
550201* -- Biochemistry-- Tracer Techniques
59 BASIC BIOLOGICAL SCIENCES
BIOCHEMICAL REACTION KINETICS
CARBON 14 COMPOUNDS
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON OXIDES
CHALCOGENIDES
COTTON PLANTS
DAILY VARIATIONS
FIELD TESTS
FLUIDS
GASES
ISOTOPE APPLICATIONS
KINETICS
LABELLED COMPOUNDS
MAGNOLIOPHYTA
MAGNOLIOPSIDA
OXIDES
OXYGEN COMPOUNDS
PLANTS
REACTION KINETICS
TESTING
TRACER TECHNIQUES
VARIATIONS