Freezing Tolerance of Winter Canola Cultivars is Best Revealed by a Prolonged Freeze Test

摘要: Small but important differences in winter survival are known to exist between canola cultivars. The objective of this study was compare a short-term (lethal temperature for 50% plant kill [LT 50 ]) and prolonged duration time [LD freeze test identify freezing tolerance (Brassica napus L. var. oleifera Metzg. Brassica rapa Sink.) species Viability following each determined by electrolyte leakage, survival, biomass shoot regrowth, root regeneration. Plant from the LT (cooling rate 3°C h −1 ) LD (−8°C isothermal up 24 d) tests were poorly correlated, only able cultivar tolerance. Electrolyte leakage did not correlate with actual measurements both tests. Shoot regrowth more sensitive viability than survival. plants subjected showed greater B. plants, yet no found within species. In test, difference detected species; however, Tolerance is critical may allow accurate screening cultivars improved test.