Interactive salinity and water stress severely reduced the growth, stress tolerance, and physiological responses of guava (Psidium Guajava L.)

Abstract

Salinity and water stress are serious environmental issues that reduced crop production worldwide. The current research was initiated (2012) in the wirehouse of the Institute of Soil and Environmental Sciences, University of Agriculture, Faisalabad, Pakistan to investigate the growth, stress tolerance, and physiological responses of guava to salinity and water shortage. Guava was grown for one year in pots containing soil with Eight treatments (control, 10 dS m−1, 20 dS m−1, 40 dS m−1, control + water stress (WS), 10 dS m−1 + WS, 20 dS m−1 + WS, 40 dS m−1 + WS) in a completely randomized design. The results indicated that plant growth, stress tolerance, and physiological parameters declined at higher salinity and water stress and could not survive at 40 dS m−1. The 20 dS m−1 + WS caused a > 70% decline in dry weights of shoot and root regarding control. Similarly, the highest decrease in stress tolerance was noticed in 20 dS m−1 + WS followed by the 20 dS m−1 treatment than control. Our findings validated that guava can be cultivated on soils having salinity ≤ 10 dS m−1 but it could not be cultivated on soils having salinity ≥ 20 dS m−1 with limited water supply.

Differential Effect of Heat Stress on Drought and Salt Tolerance Potential of Quinoa Genotypes: A Physiological and Biochemical Investigation

“…Other quinoa features for sustaining turgor pressure through osmotic adjustment during drought stress include inorganic ion buildup (e.g., Ca, K, and Na) and improved organic element synthesis (carotenoids and proline) [ 22 , 24 ]. Quinoa genotypes have several drought-resistance mechanisms, enabling this crop to grow and develop under severe drought conditions [ 25 , 26 ].…”

Influence of Foliar Application of Hydrogen Peroxide on Gas Exchange, Photochemical Efficiency, and Growth of Soursop under Salt Stress

“…The reduction of gs ( Figure 1 A) with increasing water salinity is a way for plants to minimize water losses in the form of vapor to the atmosphere and maintain turgor pressure inside their cells, in addition to reducing the absorption of salts [ 23 , 24 ]. Reductions in stomatal conductance due to salt stress were also observed in studies with other fruit plants such as acerola [ 24 ], guava [ 25 ], and custard apple [ 26 ]. The beneficial effect of H 2 O 2 observed on the plants’ stomatal conductance ( Figure 1 B) may have occurred due to the defense mechanisms of the plant, inducing the system of antioxidant enzymes, thus minimizing the harmful effects of salinity [ 27 , 28 ].…”

Analysis of the Alternative Splicing Events of Exogenous δ-Aminolevulinic Acid under NaCl Stress in Wild Jujube Seedlings

“…Chlorophyll is the primary photosynthetic pigment, and when plants are subjected to biotic or abiotic stresses, the content of chlorophyll is an important indicator of the degree to which they are affected by the stress [30][31][32]. In this experiment, the chlorophyll content of wild jujube seedling leaves decreased under NaCl stress, and spraying exogenous ALA significantly increased the contents of Chl a, Chl b, and total chlorophyll of the wild jujube seedling leaves, indicating that salt stress inhibits chlorophyll synthesis.…”