Abstract
Leaf senescence is dependent on growth conditions such as light intensity and nitrogen supply. Leaf senescence is influenced by actively growing parts such as newly developing leaves and seeds. However, some stress conditions such as nutrient deficit or oxidative stress also affect leaf senescence. To investigate how light intensity affects leaf senescence in combination with growth temperature, Quercus crispula plants were grown from seeds in growth chambers under two temperatures (25C, 15C) and two light intensities (100μmol m-2 s-1,700μmol m-2 s-1). Photosynthetic rates and nitrogen contents were measured for the index of leaf senescence. Fv/Fm and APX activities were measured for the index of oxidative stress. Dry weights of plants were weighed to estimate plant growth. How oxidative stress and plant growth affect leaf senescence will be discussed.
