Cell Damage and Biomass of Yellow Passion Fruit Under Water Salinity and Nitrogen Fertilization

Abstract

The aimed of this study was to evaluate the attenuating action of nitrogen doses on leaf cell membrane damage, dry biomass production and leaf area in the formation of yellow passion fruit seedlings irrigated with saline water. Treatments were arranged in a randomized block design, in split plots, corresponding to five levels of irrigation water salinity (plot) (ECw) (0.3; 1.0; 1.7; 2.4 and 3.1 dS m-1) and five doses of nitrogen fertilization (subplot) (60; 80; 100; 120 and 140% of 300 mg of N dm-3), which were repeated in five blocks. Plants were grown in pots (Citropote®) with a volume of 3,780 mL, which were filled with a mixture of soil, aged bovine manure and sawmill residue (shaving) in a ratio of 2:1:0.5, respectively. Waters with different levels of salinity were applied from 40 to 85 days after sowing, when the plants were in transplanting conditions. At 85 days after sowing, the percentage of cell damage based on electrolyte leakage, variables of dry biomass, leaf area and specific leaf area were evaluated. Increment in irrigation water salinity reduces the biomass accumulation of yellow passion fruit seedlings; The increase in nitrogen dose did not mitigate the effect of salinity, which reduced cell membrane integrity, making the plant more sensitive.

Gas exchange in yellow passion fruit under irrigation water salinity and nitrogen fertilization

“…Reductions in the values of A, E, and CEi are related to the osmotic effect caused by the excess of salts in the irrigation water, increasing the concentration of salts in the soil, decreasing water absorption by the roots, conditioning passion fruit seedlings to reduce stomatal opening to decrease water loss, reducing transpiration and photosynthetic rate (Andrade et al, 2019). Studies conducted by Wanderley et al (2020) evidenced 64.27% damage to the cell membrane in yellow passion fruit seedlings when subjected to an increase from 0.3 to 3.1 dS m -1 in irrigation water salinity.…”

Indução de tolerância com ácido salicílico em maracujazeiro-azedo irrigado com águas de diferentes composições catiônicas

“…There was no significant effect of the interaction The increase in electrolyte leakage with the increase in the ECw can be related to the ionic effect of salts since their concentration in the root zone can change the nutrient balance, including calcium availability (Ferraz et al 2015, Salazar et al, 2017, which is essential for cell wall formation (Wanderley et al, 2020).…”

Study on Using Some Composites to Reduce the Adverse Effects of Soil Salinity on Sakkoti Date Palms Under Upper Egypt Conditions

“…Nanoparticles are effective in enhancing stress tolerance in fruit trees growing in saline conditions, as the application of nanoparticles to leaves or roots significantly reduce the harmful effects of salinity (Zhang et al, 2017). It is known that root size plays a major role in the absorption of nutrients; salinity conditions in the root zone decrease the root size of fruit crops (Elsheery et al, 2020;Wanderley et al, 2020). The use of nano-fertilizers improved root growth by mitigating the harmful effects of salinity.…”