Crops Experiment Station/RDA

Stay-green characteristics and characters related to stay-green in inbred lines
--Keun Jin Choi, Hong Seok Lee, Moon Sup Chin, Keun Yong Park, Seon Woo Cha and Seung Eui Park

Stay-green characteristic is one of the very important characters for silage and grain corn varieties, providing longer duration of filling period for high seed yield and longer duration of harvesting time for silage. This experiment was carried out to find out the stay-green characteristics, and characters related to stay-green, in 40 inbreds selected from Korea and other countries. Each inbred differed in maturity period, leaf number and leaf area. The mean number of days from silking to ear leaf senescence (DELS) of 40 inbreds was 34.4 days, the mean fresh leaf number was 9.54, the mean fresh leaf area was 2,522 cm2, and the mean chlorophyll content in silking stage was 0.073mg /2.8cm2. The inbreds were classified into four groups based on the peroxidase band pattern in the seed. DELS for the four groups were 27.3, 30.1, 37.5 and 41.2 days, respectively. The characteristics related to stay-green were fresh leaf number, fresh leaf area, chlorophyll content and DELS. Their correlation coefficients with the stay-green score were -0.992**, -0.977**, -0.984** and -0.974**, respectively. The stay-green inbreds had high photosynthetic activities and also had high protein and lipid contents, but metabolism of crude fiber and neutral detergent fiber (NDF) in leaves was low. The stay-green inbreds showed disease resistance to several diseases such as Helminthosporium turcicum, maize dwarf mosaic virus (MDMV), black streaked dwarf virus (BSDV) and stalk rot, and had especially great resistance to Helminthosporium maydis.
Please Note: Notes submitted to the Maize Genetics Cooperation Newsletter may be cited only with consent of the authors

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