SUWON, KOREA
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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