ABSTRACT Guava is a fruit widely produced in Northeast Brazil, region that has sources of water with high levels salts, making it difficult for irrigated production to expand. Thus, extremely important search techniques allow the management these waters agriculture. objective present study was evaluate photosynthetic pigments, quantum yield photosystem II, and intercellular leakage electrolytes...

This article first presents two theories representing distinct approaches to the field of stress research: Selye's theory of `systemic stress' based in physiology and psychobiology, and the `psychological stress' model developed by Lazarus. In the second part, the concept of coping is described. Coping theories may be classified according to two independent parameters: traitoriented versus stat...

Soybean is highly sensitive to drought stress during its flowering period. Heinong84 (HN84) and Hefeng46 (HF46) were planted in clay loam, silty sandy clay. We studied the effects of on content membrane lipid peroxides soybean leaves, activity antioxidant enzymes, key enzymes nitrogen metabolism under different soil conditions. Our results showed that had clear physiological responses stress. W...

Suboptimal light stress in grapevines is increasing worldwide with the spread of grapevine cultivation, which can affect physiology and productivity, such as Southern China. Abscisic acid (ABA) an important hormone plant adaptive responses to abiotic stress, including low stress. However, ABA signaling pathway genes (APGs) are not well characterized grapevine, little known their potentially mit...