Two greenhouse experiments were conducted in order to investigate the effects of different levels of water stress on gas exchange, chlorophyll fluorescence, chlorophyll content, antioxidant enzyme activities, lipid peroxidation, and yield of tomato plants (Solanum lycopersicum cv. Jinfen 2). Four levels of soil water content were used: control (75 to 80% of field water capacity), mild water stress (55 to 60%), moderate water stress (45 to 50%), and severe water stress (35 to 40%). The controlled irrigation was initiated from the third leaf stage until maturity. The results of
two-year trials indicated that the stomatal conductance, net photosynthetic rate, light-saturated photosynthetic rate, and saturation radiation decreased generally under all levels of water stress during all developmental stages, while compensation radiation and dark respiration rate increased generally. Water stress also declined maximum quantum yield of PSII photochemistry, electron transfer rate, and effective quantum yield of PSII photochemistry, while nonphotochemical quenching increased in all developmental stages. All levels of water stress also caused a marked reduction of chlorophyll a, chlorophyll b, and total chlorophyll content in all developmental stages, while activities of antioxidant enzymes, such as superoxide dismutase, peroxidase, and catalase, and lipid peroxidation increased., X. K. Yuan, Z. Q. Yang , Y. X. Li, Q. Liu, W. Han., and Obsahuje seznam literatury
The paper analyzes the ways in which the state approach to homosexuality in Communist Czechoslovakia intersected with actually lived lives and experiences of ordinary non -heterosexual people who identified (mainly retroactively) as gays, lesbians or transsexuals. In the Czech context, this is the first research of its kind and combines oral history with a gender analysis of sexological literature from the communist period, to put together a complex mosaic of sexuality in recent past. This confrontation of methods exposes the processes by which gender and sexuality in this era worked as tools of regulation and control, and shows how non -heterosexual people responded to this pressure. The paper offers a multilayer reading and analysis of normality/deviance, public/private and submission/resistance in communist Czechoslovakia., Věra Sokolová., and Obsahuje bibliografii