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Spontaneous and induced blocking and unblocking of phloem transport
Author(s) -
GOESCHL J. D.,
MAGNUSON C. E.,
FARES Y.,
JAEGER C. H.,
NELSON C. E.,
STRAIN B. R.
Publication year - 1984
Publication title -
plant, cell and environment
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.646
H-Index - 200
eISSN - 1365-3040
pISSN - 0140-7791
DOI - 10.1111/1365-3040.ep11592141
Subject(s) - petiole (insect anatomy) , abutilon , phloem , blocking (statistics) , horticulture , botany , biology , mathematics , weed , hymenoptera , statistics
Steady‐state labelling with 11 CO 2 was used to observe the blocking of phloem transport, induced by chilling short regions of stems or petioles of velvetleaf ( Abutilon theophrasti Medic.) or cotton ( Gossipium hirsutum L.). The abruptness of these blockages was evidenced by sharp decreases in 11 C activity below, and increases above a 2 to 3 cm region cooled from 28°C to 18 or 13°C for periods as short as 2 min. Abrupt unblocking of transport in velvetleaf occurred a few minutes after rewarming, as evidenced by a sharp rise and and overshoot in 11 C activity. Recovery of transport in cotton was more prolonged and was marked by occasional spontaneous blocking and unblocking of transport at various points along the petiole or stem, not necessarily in the cooled region. Similar spontaneous events were often observed in undisturbed cotton plants, but only rarely in velvetleaf.