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Internodal Compartmentation of Stem‐Infused [ 14 C]Sucrose in Sweet and Grain Sorghum
Author(s) -
Tarpley Lee,
Vietor Donald M.,
Miller Frederick R.
Publication year - 1994
Publication title -
crop science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.76
H-Index - 147
eISSN - 1435-0653
pISSN - 0011-183X
DOI - 10.2135/cropsci1994.0011183x003400040052x
Subject(s) - sucrose , phloem , biology , parenchyma , plant stem , sweet sorghum , botany , intracellular , sorghum bicolor , sorghum , xylem , cultivar , main stem , horticulture , agronomy , biochemistry
Stem infusion was evaluated for quantifying downward movement, intracellular allocation, and interorgan partitioning of assimilate in sweet and grain sorghum [ Sorghum bicolor (L.) Moench] stems during mid‐grain fill and post‐black layer. Sucrose concentration did not vary below the site of infusion with [ 14 C]sucrose, although gradients of intracellular 80%‐ethanol soluble and insoluble 14 C‐components were established in the stem. Variation in gradient steepness between cultivars resulted from aspects of parenchymal uptake or phloem uptake of sucrose and appears related to sucrose‐concentrating ability. The introduced [ 14 C]sucrose concentration gradient in stem tissue is useful for studying stem mechanisms that controls ink strength.