Effects of nitrogen supply on xylem cytokinin delivery, transpiration and leaf expansion of pea genotypes differing in xylem-cytokinin concentration

Functional Plant Biology : FPB
Ian C DoddC. A. Beveridge

Abstract

The rms2 and rms4 pea (Pisum sativum L.) branching mutants have higher and lower xylem-cytokinin concentration, respectively, relative to wild type (WT) plants. These genotypes were grown at two levels of nitrogen (N) supply for 18-20 d to determine whether or not xylem-cytokinin concentration (X-CK) or delivery altered the transpiration and leaf growth responses to N deprivation. Xylem sap was collected by pressurising de-topped root systems. As sap-flow rate increased, X-CK declined in WT and rms2, but did not change in rms4. When grown at 5.0 mm N, X-CKs of rms2 and rms4 were 36% higher and 6-fold lower, respectively, than WT at sap-flow rates equivalent to whole-plant transpiration. Photoperiod cytokinin (CK) delivery rates (the product of transpiration and X-CK) decreased more than 6-fold in rms4. Growth of plants at 0.5 mm N had negligible (< 10%) effects on transpiration rates expressed on a leaf area basis in WT and rms4, but decreased transpiration rates of rms2. The low-N treatment decreased leaf expansion by 20-25% and expanding leaflet N concentration by 15%. These changes were similar in all genotypes. At sap-flow rates equivalent to whole-plant transpiration, the low N treatment decreased X-CK in rms2 but had no d...Continue Reading

References

Jun 17, 1998·The Plant Journal : for Cell and Molecular Biology·H SakakibaraT Sugiyama
Jan 1, 1992·Plant Physiology·M E SamuelsonC M Larsson

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Citations

Nov 24, 2005·Journal of Experimental Botany·Ian C Dodd, Christine A Beveridge
Mar 1, 2016·Functional Plant Biology : FPB·Sergey ShabalaUlrike Mathesius
Jul 6, 2013·Journal of Plant Research·Xiao-Ling WangZhen-Qing Li
Dec 6, 2005·Current Opinion in Plant Biology·Christine A Beveridge

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