Effect of water stress on physiological processes, leaf greenness (SPAD index) and dry matter yield of Lolium perenne and Dactylis glomerata
2006
Olszewska, M.,University of Warmia and Mazury, Olsztyn (Poland). Dept. of Grassland Management
A greenhouse pot experiment was performed at two soil moisture levels: 80 percent field water capacity (optimum moisture content) and 40 percent field water capacity (water stress) to study some varieties of perennial ryegrass (Maja, Argona) and orchard grass (Dala, Areda). Rates of phytosynthesis and transpiration were measured during vegetation with a Li-Cor 6400 gas analyzer, and chlorophyll concentration was determined with a SPAD-502 chlorophyll meter. Photosynthetic water use efficiency (WUE) was also calculated. It was found that a decrease in soil moisture from 80 to 40 percent field water capacity reduced the rate of photosynthesis by on average 42 percent. The strongest response was recorded in var. Maja, where the rate of phytosynthesis decreased by 46 percent. Var. Dala evaporated the most water, and var. Areda - the least. Higher values of WUE and SPAD were recorded in the tested grass varieties under water deficiency conditions. Perennial ryegrass varieties were characterized by a higher chlorophyll content of leaves. All varieties compared in the study responded by yield decrease to a lower soil moisture. The strongest response was noted in var. Argona, which was also characterized by the lowest water use efficiency
Показать больше [+] Меньше [-]Ключевые слова АГРОВОК
Библиографическая информация
Эту запись предоставил Central Agricultural Library