Effects of ammonium to nitrate ratio on growth, nitrogen metabolism, photosynthetic efficiency and bioactive phytochemical production ofPrunella vulgaris

Effects of different water management options and fertilizer supply on photosynthesis, fluorescence parameters and water use efficiency of Prunella vulgaris seedlings

“…Soil water deficit in the dry season is one of the most important limitations to photosynthesis and consequently, P. vulgaris productivity [ 1 , 6 ]. However, there are numerous well-documented photosynthetic responses of plants to N, P, and K fertilization, which include significant and positive correlations between photosynthetic capacity and leaf N, P, and K content, suggesting that a large proportion of these elements is used for the synthesis of various components in the photosynthetic apparatus [ 6 , 8 ]. Furthermore, fertilization (e.g., N, P, K) frequently increases cell wall rigidity and osmotic adjustment [ 6 , 8 ].…”

“…However, there are numerous well-documented photosynthetic responses of plants to N, P, and K fertilization, which include significant and positive correlations between photosynthetic capacity and leaf N, P, and K content, suggesting that a large proportion of these elements is used for the synthesis of various components in the photosynthetic apparatus [ 6 , 8 ]. Furthermore, fertilization (e.g., N, P, K) frequently increases cell wall rigidity and osmotic adjustment [ 6 , 8 ]. Increased fertilization might improve the photosynthetic capacity or stomatal control under water and nutrient deficit conditions.…”

“…Fertilizer could increase Fv/Fm and the effective quantum yield of photochemical energy conservation in PS2 (Fv′/Fm′) [ 14 ]. The Chl content and photosynthetic rates might also be enhanced through the supply of N, P, and K [ 6 , 8 ]. These authors suggested that fertilization might alleviate photoinhibition and photodamage caused by drought stress.…”

Effect of ammonia stress on nitrogen metabolism of Ceratophyllum demersum

“…Under the stresses of ionic N and molecular N, total N content increased (Figure B) and NO 3 – content decreased, whereas the NH 4 + content was increased in vivo (Figure C and D), which may be the result of a feedback effect . A central molecule of N metabolism in plants, NH 4 + can be produced in 3 main ways: assimilation of nitrate N, amino acid deamination reaction, and light respiration, and it can be incorporated into amino acids by glutamine synthetase .…”

“…As an inducible enzyme, nitrate reductase's existence in the root and leaves is strongly dependent on NO 3 – . Deng et al found that NO 3 – primarily adjusted the activity levels of nitrate reductase gene transcription and translation.…”