Publication Date
1985
Location
Kyoto Japan
Description
The response of heading to short day and low temperature has been studied in 48 lines of Lolium species grown under four photoperiod conditions. After fully vernalized in field, materials were grown under four conditions: 24 hours at high and natural temperatures, 13 hours and natural daylength. The number of days from beginning of treatment to flag leaf expansion was recorded. We considered response to short day (RSD), response to low temperature(RLT), and earliness in a narrow sense as three important components controlling heading behavior after vernalization. RSD was measured by difference of the number of days to flag leaf expansion between 13 and 24 hours at high temperature, RLT measured by difference between high and natural temperature treatments under 24 hours, and earliness in a narrow sense measured by value of 24 hours at high temperature. The ranges of RSD, RLT and earliness in a narrow sense for 48 lines were 81.9, 10.7 and 8.7 days, respectively. The range of RSD was the largest in three components. One selected line for late heading, LH 4-5, showed the larger RSD than its base line, and than any introduced and Japanese local cul ti vars. But there were no selected lines with smaller RSD than an introduced cultivar, CPI21946, in 41 lines of Italian ryegrass. Fall heading line was bred. This line was considered insensitive to a short day because it was able to head under six hours daylength. We considered that this line had the smaller RSD than CPI21946. It was concluded that RSD was most important for heading behavior of vernalized plants, and that single plants carried the great genetic variation for RSD, as shown by appearance of fall heading line, and selected line, LH 4-5 with RSD beyond range of introduced and Japanese local cultivars.
Citation
Yamaguchi, H and Suzuki, Shigeru, "Variation in Photoperiodical Response of Heading in Italian Ryegrass (Lolium multiflorum Lam.)" (1985). IGC Proceedings (1985-2023). 7.
(URL: https://uknowledge.uky.edu/igc/1985/ses2/7)
Included in
Agricultural Science Commons, Agronomy and Crop Sciences Commons, Plant Biology Commons, Plant Pathology Commons, Soil Science Commons, Weed Science Commons
Variation in Photoperiodical Response of Heading in Italian Ryegrass (Lolium multiflorum Lam.)
Kyoto Japan
The response of heading to short day and low temperature has been studied in 48 lines of Lolium species grown under four photoperiod conditions. After fully vernalized in field, materials were grown under four conditions: 24 hours at high and natural temperatures, 13 hours and natural daylength. The number of days from beginning of treatment to flag leaf expansion was recorded. We considered response to short day (RSD), response to low temperature(RLT), and earliness in a narrow sense as three important components controlling heading behavior after vernalization. RSD was measured by difference of the number of days to flag leaf expansion between 13 and 24 hours at high temperature, RLT measured by difference between high and natural temperature treatments under 24 hours, and earliness in a narrow sense measured by value of 24 hours at high temperature. The ranges of RSD, RLT and earliness in a narrow sense for 48 lines were 81.9, 10.7 and 8.7 days, respectively. The range of RSD was the largest in three components. One selected line for late heading, LH 4-5, showed the larger RSD than its base line, and than any introduced and Japanese local cul ti vars. But there were no selected lines with smaller RSD than an introduced cultivar, CPI21946, in 41 lines of Italian ryegrass. Fall heading line was bred. This line was considered insensitive to a short day because it was able to head under six hours daylength. We considered that this line had the smaller RSD than CPI21946. It was concluded that RSD was most important for heading behavior of vernalized plants, and that single plants carried the great genetic variation for RSD, as shown by appearance of fall heading line, and selected line, LH 4-5 with RSD beyond range of introduced and Japanese local cultivars.
