Endogenous gibberellins and auxins in the stem ofbryophyllum crenatum in relationship to its polarity

Šebánek, J.; Kopecky, F.; Slabý, K.

doi:10.1007/bf02923279

Cited by 8 publications

(1 citation statement)

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“…It is commonly known that decapitation has become a common method to stimulate lateral growth in applications and to study auxin's regulation and mechanism (43,44). Because GA 1 increases from the apex to the stem base in contrast to auxin highly concentrated in apical bud (45), the apical pruning in this study primarily reduced auxin levels in plants although no measurement was made on the auxin reduction caused by decapitation. Endogenous autotoxicity induced by auxin was demonstrated in both auxin reducing and increasing experiments.…”

Section: Auxin Reduction As a Triggering Factor For Induced In Vivo B...mentioning

confidence: 99%

Induced endogenous autotoxicity in Camptotheca

Wang²,

Wei³

2010

Front Biosci

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Are plants always immune to their endogenous toxic secondary metabolites? Without disturbance, fast-growing Camptotheca plants can avoid poison by its endogenous camptothecin (DNA topoisomerase I inhibitor) at more than 10 times higher than the fatal concentration of exogenous application to the plant. Pruning has been long known to promote lateral growth; however, here we report that auxin-reducing pruning can induce endogenous autotoxicity in Camptotheca: dramatic deviations from normal morphogenesis, including serrated or lobed leaves, disturbed phyllotaxis, and fasciated stems. The abnormal morphogenesis appears correlatively with the elevated camptothecin contents following decapitation pruning. Plants resume their normal morphogenesis when camptothecin is reduced to natural levels after stress discontinuation. Exogenously applied auxin restores a dwarf mutant of high camptothecin yield to its parent type of lower yield, suggesting that auxin may be a triggering factor for the observed autotoxicity. Autotoxicity induced by endogenous compounds has not been reported before.

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Section: Auxin Reduction As a Triggering Factor For Induced In Vivo B...mentioning

confidence: 99%