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Contrasting Effects of Phosphorus and Potassium Deficiencies on Leaf Area Development in Maize

“…The duration of leaf tip elongation through the whorl depends on the elongation rate and sheath length (Skinner and Nelson, 1995). In P-deficient wheat, Rodríguez et al (1998b) determined that increases in phyllochron were due to a reduction in leaf differentiation rate and leaf elongation rate through the whorl. In P-deficient wheat, Rodríguez et al (1998b) determined that increases in phyllochron were due to a reduction in leaf differentiation rate and leaf elongation rate through the whorl.…”

“…An increase in phyllochron may be a consequence of a reduction in leaf expansion rate, as was observed with P deficiency in maize (Colomb et al, 2000;Plénet et al, 2000). In P-deficient wheat, Rodríguez et al (1998b) determined that increases in phyllochron were due to a reduction in leaf differentiation rate and leaf elongation rate through the whorl. In the present study, it is likely that the reduced LAR was a consequence of a reduced leaf expansion rate.…”

“…Final leaf number in maize is sensitive to changes in factors affecting crop development such as photoperiod (Muchow and Carberry, 1989) and temperature (Tollenaar and Hunter, 1983). In wheat, some studies have shown that final leaf number on the main stem was not altered under P deficiency; however, total leaf area decreased because of a reduction in tiller number (Gutiérrez-Boem and Thomas, 1998;Rodríguez et al, 1998b). Phosphorus (Colomb et al, 2000;Plénet et al, 2000;Fletcher et al, 2008) or K ( Jordan-Meille and Pellerin, 2004) deficiency did not alter final leaf number in maize.…”

“…maize (Plénet et al, 2000), but also in wheat (Gutiérrez-Boem and Thomas, 1998;Rodríguez et al, 1998b) and barley (Hordeum vulgare L.; Prystupa et al, 2003) under controlled conditions. In the present study, decreases in LAR in response to K deficiency were not significant, as opposed to Jordan-Meille and Pellerin (2004), who observed small differences in this rate under K-deficient conditions in field-grown maize.…”

Uptake of phosphorus from surfactant solutions by wheat leaves: spreading kinetics, wetted area, and drying time

“…For Genapol ® X-080, the concentration was chosen to yield complete wetting within 20 s; 0.1% w v -1 . 58,59 Phosphorus measured in the plant consists of P taken up from the soil, from the seed and from the P applied to the leaves (the foliar fertilizer). The above ground dry weights of plants for the three different adjuvant treatments differed (p ≤0.05) ( Table 2), with the Agral ® treated plants being the smallest.…”