Nonstructural carbohydrates in auxillary branches and main stem of senescent and nonsenescent sorghum types

Journal Article · · Crop Science; (USA)

OSTI ID:6842738

Vietor, D M; Miller, F R; Cralle, H T ^[1]

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1. Texas A M Univ., College Station (USA)

Although the concentration of nonstructural carbohydrates in main stems has been compared between senescent and nonsenescent types of sorghum (Sorghum bicolor (L.) Moench), nonstructural carbohydrates in auxillary branches at upper nodes have not been compared between senescence types. The objective of this study was to test the hypothesis that nonsenescent hybrids of semidwarf sorghum accumulate more nonstructural carbohydrates in branches and in the main stem than senescent hybrids after black layer. Plants were labeled (exposed to {sup 14}CO{sub 2}) 14 d before, at, and 14 d after black layer formation under field conditions. Nonstructural carbohydrates in branches and in lower and upper portions of the main stem were sampled 5 or 7 d after labeling. Comparisons between hybrids 14 d after black layer supported the hypothesis. The content of nonstructural carbohydrates in branches increased twofold more for nonsenescent than for senescent plants between stages of labeling at and 14 d after black layer. The concentration and content of nonstructural carbohydrates in main stems of senescent plants declined 40% or more during the same period. Branches comprised 84 to 100% of the increase in content of nonstructural carbohydrates even though concentrations and {sup 14}C-photosynthate recoveries in the nonstructural fraction of branches declined after black layer. Nonstructural carbohydrates in branches at upper nodes need to be monitored in addition to those in main stems for comparisons involving the senescence types from this study.

• OSTI ID: 6842738
• Journal Information: Crop Science; (USA), Journal Name: Crop Science; (USA) Vol. 30:1; ISSN CRPSA; ISSN 0011-183X
• Country of Publication: United States
• Language: English

Related Subjects

09 BIOMASS FUELS
090800* -- Biomass Fuels-- Production-- (1990-)
BIOMASS
BIOSYNTHESIS
CARBOHYDRATES
CARBON 14 COMPOUNDS
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON OXIDES
CEREALS
CHALCOGENIDES
CHEMICAL REACTIONS
ENERGY SOURCES
GRASS
ISOTOPE APPLICATIONS
LABELLED COMPOUNDS
LILIOPSIDA
MAGNOLIOPHYTA
METABOLISM
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PHOTOCHEMICAL REACTIONS
PHOTOSYNTHESIS
PLANTS
RENEWABLE ENERGY SOURCES
RESOURCE POTENTIAL
SORGHUM
SYNTHESIS
TRACER TECHNIQUES