Abstract
The uptake of IAA into excised mesocotyls of non-irradiated maize seedlings was linear up to a concentration of about 4×M and in this range there was a tight coupling between the IAA in the stele and the cortex. Prior irradiation with white light of intact seedlings unbalanced this coupling. Lateral and longitudinal transport were affected differently. In the stele, the effect of prior irradiation on longitudinal transport was multiphasic, with an initial stimulatory effect followed by a negative effect at longer prior irradiation times. The lateral transport from the stele to the cortex showed no stimulatory effect and appeared to be inhibited within at least 15 min. The effect of the prior irradiation on longitudinal transport in the stele appeared to be a high intensity effect. In contrast, the effect of the prior irradiation on the lateral transport from the stele to the cortex was saturated at much lower intensities. The data suggest that the light induced change in the lateral transport of IAA between the two tissues may be due to changes either in the number of open lateral transport channels/carriers or in the conductivity of these channels/carriers.
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References
Bandurski RS Schulze A Dosrosiers M Jensen P Epel B and Reinecke D (1990) Relationship between stimuli, IAA and growth. In: Pharis R and Rood S eds. (1988) Plant Growth Substances. pp 341–352. Springer-Verlag, Berlin
Cholodny N (1927) Wuchshorm und Trospismen bei den Pflanzen. Biologisches Zentralblatt 47: 604–626
Epel BL and Bandurski RS (1990a) Apoplastic domains and sub- domains in the shoots of etiolated corn seedlings. Physiol Plant 79: 599–603
Epel BL and Bandurski RS (1990b) Tissue to tissue symplastic communication in the shoots of etiolated corn seedlings. Physiol Plant 79: 604–609
Epel BL and Erlanger MA (1991) Light regulates symplastic communication in etiolated corn seedlings. Physiol Plant 83: 149–153
Epel BL Warmbrodt RD and Bandurski RS (1992) Studies on the longitudinal and lateral transport of IAA in the shoots of etiolated corn seedlings. J Plant Physiol 140: 310–318
Iino M (1982a) Action of red light on indole-3-acetic acid status and growth in coleoptiles of etiolated maize seedlings. Planta 156: 21–32
Iino M (1982b) Inhibitory action of red light on the growth of the maize mesocotyl: evaluation of the auxin hypothesis. Planta 156: 388–395
Iino M (1991) Mediation of tropisms by lateral translocation of endogenous indole-3-acetic acid in maize coleoptiles. Plant Cell Environ 14: 279–286
Paine PL Moore LC and Horowitz SB (1975) Nuclear envelope permeability. Nature 254: 109–114
Parker KE and Briggs WR (1990) Transport of indole-3-acetic acid during gravitropism in intact maize coleoptiles. Plant Physiol 94: 1763–1769
Vanderhoef LN and Briggs WR (1978) Red light-inhibited mesocotyl elongation in maize seedlings. I. The auxin hypothesis. Plant Physiol 61: 534–537
Van Overbeek J (1936) Growth hormone and mesocotyl growth. Trav Bot Neerl 333–340
Wen FW (1928) Wuchsstoff und Wachstum. Rec. Trav. Bot. Neerl. 25: 1–116
Yahalom A Epel BL Glinka Z MacDonald IR and Gordon DC (1987) A kinetic analysis of phytochrome controlled mesocotyl growth in Zea mays seedlings. Plant Physiol 84: 390–394
Yahalom A Epel BL and Glinka Z (1988) Photomodulation of mesocotyl elongation in maize seedlings: Is there a linear correlative relationship between phytochrome, auxin, and cell wall extensibility. Physiol Plant 72: 428–433
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Epel, B.L., Erlanger, M.A. Light differentially regulates lateral and longitudinal auxin transport in the mesocotyl of etiolated maize seedlings. Plant Growth Regul 14, 167–171 (1994). https://doi.org/10.1007/BF00025219
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DOI: https://doi.org/10.1007/BF00025219