Coffea arabica seedlings genotypes are tolerant to high induced selenium stress: Evidence from physiological plant responses and antioxidative performance.

Selenium (Se) is considered a beneficial element to higher plants based on its regulation of antioxidative system under abiotic or biotic stresses. However, the limit of beneficial and toxic physiological effects of Se is very narrow. In the present study, the antioxidant performance, nutritional composition, long-distance transport of Se, photosynthetic pigments, and growth of Coffea arabica genotypes in response to Se concentration in solution were evaluated.

Coffee seedlings growth under varied NO:NH ratio: Consequences for nitrogen metabolism, amino acids profile, and regulation of plasma membrane H-ATPase.

Root plasma membrane H-ATPase electrochemical equilibrium for optimum coffee plant growth can be modulated by specific ammonium:nitrate (NO:NH) ratio supply. This study aimed to evaluate the coffee seedlings responses to varying ammonium:nitrate (NO:NH) ratio and to depict how much NO and NH plants can use in terms of growth, nitrogen metabolism, amino acids profile and regulation of root plasma membrane H-ATPase. Coffee plants were grown in nutrient solution with the following NO:NH ratios (%): 100:0; 87.