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Investigations on photosynthesis and assimilate translocation in Daucus carota L. as influenced by a varied phosphorus supply and changes in the endogenous hormonal system following GA 3 treatments
Author(s) -
Bender L.,
Stiebeling B.,
Neumann K.H.
Publication year - 1986
Publication title -
zeitschrift für pflanzenernährung und bodenkunde
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.644
H-Index - 87
eISSN - 1522-2624
pISSN - 0044-3263
DOI - 10.1002/jpln.19861490504
Subject(s) - chromosomal translocation , daucus carota , photosynthesis , shoot , tap water , taproot , sink (geography) , phosphorus , sucrose , cytokinin , phosphorus deficiency , carbon fixation , endogeny , botany , biology , chemistry , agronomy , horticulture , auxin , biochemistry , cartography , organic chemistry , environmental engineering , gene , engineering , geography
Investigations on phosphorous uptake, photosynthetic 14 CO 2 fixation, assimilate translocation and endogenous cytokinin concentrations were carried out with carrot plants at low and high level phosphorus supply. Source/sink relations were changed in favour of the source (shoot) and at the expence of the sink (root) by GA 3 sprays. Following GA 3 treatments the 2‐isopentenyl adenine (2iP) concentration in the tap root was strongly decreased. However, though sink development was drastically reduced due to this treatment, the concentration of translocated labelled assimilates (mainly sucrose) was almost doubled in the tap root as compared to the untreated controls. In plants optimally supplied with phosphorus growth, 2iP concentration in the tap root, photosynthetic CO 2 fixation and assimilate translocation were considerably increased in comparison with the low phosphorus treatment.