Diurnal changes in assimilate concentrations and fluxes in the phloem of castor bean (Ricinus communis L.) and tansy (Tanacetum vulgare L.).

Planta
Jose KallarackalEwald Komor

Abstract

Reports about diurnal changes of assimilates in phloem sap are controversial. We determined the diurnal changes of sucrose and amino acid concentrations and fluxes in exudates from cut aphid stylets on tansy leaves (Tanacetum vulgare), and sucrose, amino acid and K(+) concentrations and fluxes in bleeding sap of castor bean pedicel (Ricinus communis). Approximately half of the tansy sieve tubes exhibited a diurnal cycle of sucrose concentrations and fluxes in phloem sap. Data from many tansy plants indicated an increased sucrose flux in the phloem during daytime in case of low N-nutrition, not at high N-nutrition. The sucrose concentration in phloem sap of young Ricinus plants changed marginally between day and night, whereas the sucrose flux increased 1.5-fold during daytime (but not in old Ricinus plants). The amino acid concentrations and fluxes in tansy sieve tubes exhibited a similar diurnal cycle as the sucrose concentrations and fluxes, including their dependence on N-nutrition. The amino acid fluxes, but not the concentrations, in phloem sap of Ricinus were higher at daytime. The sucrose/amino acid ratio showed no diurnal cycle neither in tansy nor in Ricinus. The K(+)-concentrations in phloem sap of Ricinus, but not th...Continue Reading

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Citations

Mar 22, 2013·Journal of the Royal Society, Interface·Kaare H JensenN Michele Holbrook
Aug 1, 2014·Proceedings. Biological Sciences·Calum W RussellAngela E Douglas
Sep 10, 2013·Journal of Chemical Ecology·W H Gera HolNicole M Van Dam
May 9, 2014·Journal of Plant Physiology·Izhar Ahmad, Frans J M Maathuis
Nov 1, 2017·Journal of Experimental Botany·Hanxiang WuJean-Louis Bonnemain
Apr 3, 2020·Insect Science·Vamsi NalamPunya Nachappa
Oct 13, 2018·Journal of Experimental Botany·Julien BesnardSakiko Okumoto

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