Submitted to: American Society of Sugar Cane Technologists
Publication Type: Abstract Only
Publication Acceptance Date: 6/18/1997
Publication Date: N/A
Technical Abstract: Canal Point sugarcane cultivar development program consists of five selection stages which include Seedlings, Stages I, II, III and IV. Each year in the Stage II test, about 1,000 selections are evaluated against one or more checks. Since seasonal conditions may not produce similar influences on all clones in the test, large gennotype x environment interactions may occur and would greatly affect selection efficiency. Plant cane data on three checks (CP 57-603, CP 65-357 and CP 70-1133) in Stage II test over 14 years were used to examine the stability of performance and to determine if there is any trend for their performance over this period. The characters studied were stalk number, stalk weight (kg), Brix, percent sucrose, kilogram of sugar per metric ton of cane (S/T), cane yield [metric tons per hectare (TCH)], and sugar yield [metric tons per hectare (TSH)]. Linear regression analyses indicate that performance stability varied among characters within each check. Most characters examined indicate that both CP 65- 357 and CP 70-1133 responded to improved environments. However, four characters, percent sucrose, S/T, TCH and TSH indicate that CP 57-603 performed relatively consistent over years. Analyses of a time series indicate fluctuation around the mean performance for most of the characters examined in all three checks. Information on the performance stability of check cultivars should increase the selection efficiency.