Nitrogen differentially modulates photosynthesis, carbon allocation and yield related traits in two contrasting Capsicum chinense cultivars

Effect of ammonium and nitrate supplies on nitrogen and sucrose metabolism of Cabernet Sauvignon (Vitis vinifera cv.)

“…Therefore, the balance between the nitrogen and carbon metabolic pathways is widely recognized as being of paramount importance toward improving nitrogen use efficiency. 38 When single nitrogen form exists in excess, the internal competition for assimilates between the vegetative and reproductive organs can be responsible for decreased sugar and nitrogen contents, 39 and the results of the present study were consistent with these findings. We found that GS activity was negatively correlated with soluble sugar contents, whereas NR activity was positively correlated with soluble sugar contents.…”

Sucrose Utilization for Improved Crop Yields: A Review Article

“…On the other hand, excessive N supply is mainly characterized by a wide range of ammonium (NH 4 + ) toxicity symptoms, including ion imbalance, leaf chlorosis, pH regulation disorder, and physiological metabolic disorder [ 157 ]. The excessive N-replete also affects the net carbon assimilation rate via its effects on the photosynthetic component [ 158 ]. Studies have also reported that excessive N supply reduces the root carbon by diverting unassimilated NO 3 − acropetally back to the shoot via xylem to promote shoot development, thus retaining more photosynthetic carbon in the shoot [ 159 , 160 ].…”

“…The development in the shoot organ only stimulates vegetative growth, reducing the number of flowers and fruit yield. This suggests that a balanced distribution of sucrose between the source leaves and flowers might act as major yield-determinant factors [ 158 ], since the flowering process depends on sucrose supply. In contrast to the findings regarding lower root:shoot ratio, a higher root:shoot ratio was observed under excessive NH 4 + compared with NO 3 − in tobacco [ 161 ] and cucumber [ 162 ].…”

Specific leaf area is modulated by nitrogen via changes in primary metabolism and parenchymal thickness in pepper

“…Few studies have explored the SLA behavior at the intraspecific level, and among cultivars of crop species (Van Den Boogaard et al 1997;Jinwen et al 2009;Xiong et al 2016). In this regard, we have previously demonstrated that (1) N fertilization has a major impact on the growth and yield of Capsicum chinense, and (2) commercial varieties of this species, Biquinho and Habanero, have remarkable differences in terms of fruit set and size, sink-source ratio, and leaf morphology (de Ávila Silva et al 2019b). Thus, based on the impact of N supply on growth and fruit production and the intraspecific variation for these traits in C. chinense, we assessed the influence of N supply on SLA and related traits.…”

“…To evaluate the influence of N doses and shading on the SLA, individual experiments were carried out in two consecutive years. In the first experiment, following the development of the first sympodial unit, 0, 20, 50, 125, and 312.5 mg N dm −3 were applied in the soil as a solution every 20 days for a total of five equal supplementations, exactly as previously described (de Ávila Silva et al 2019b). The first experiment was performed in a greenhouse with temperature of 25 ± 5 °C and an average irradiance of 500 µmol photons m −2 s −1 .…”