Pia Walch-Liu

TL;DR: It seems likely that the presence of NO3- is required to maintain biosynthesis and/or root to shoot transfer of cytokinins at a level that is sufficient to mediate normal leaf morphogenesis.

TL;DR: It is speculated on the possibility that the effects elicited by external L-glutamate represent a novel form of foraging response that could potentially enhance a plant's ability to compete with its neighbours and micro-organisms for localized sources of organic nitrogen.

TL;DR: It is reported here that, at micromolar concentrations and in a genotype-dependent manner, exogenous l-glutamate is also able to elicit complex changes in Arabidopsis root development, with a remarkable degree of natural variation in l-Glutamate sensitivity.

TL;DR: It is suggested that neither ABA nor ethylene are directly involved in the effects of N form on leaf growth, and stimulation of leaf growth by NO(3)(-) was consistently associated with increased concentration of the physiologically active forms of cytokinins, zeatin andZeatin riboside, in the xylem exudate, indicating a major role for cytokinin as long-distance signals mediating the shoot response to NO( 3)(-) perception in roots.

TL;DR: Results indicate that in tomato at least two high-affinity NH4+ transporters, LeAMT1;1 and LeAMt1;2, are differentially regulated by N and contribute to root hair-mediated NH4 + acquisition from the rhizosphere.