Abstract:

【Objective】The aim of the test is to study the heat resistance of lily hybrids and their parents, to screen excellent breeding materials.【Method】The plantlets of lily hybrids from Lilium pumilum(provenance of Chengde)בSiberia’ and L.pumilum(provenance of Daqing)בSiberia’ as well as their parents were used as experimental materials and they treated at different temperatures (25℃, 28℃, 31℃, 34℃, 37℃, 40℃ ), and then the changing regularity of resistance physiological indices and the electrical impedance spectroscopy parameters were studied. 【Result】 Treatment at 31℃ promoted the chlorophyll content and root activity, hybrids were their parents or were better than parents in chlorophyll content and activity, and there was a significant correlation between the two indexes(P＜0.01). At 37 ℃, the proline content of two hybrids reached the lowest(P＜0.05), but still was higher than that of their parents. At 34 ℃, the relaxation time rose and the conductivity decreased significantly, the hybrids were better than male parents, the two indexes had a significant correlation (P＜0.05). 【Conclusion】 The heat resistance of L. pumilum (provenance of Daqing) was higher than L. pumilum(provenance of Chengde), the heterosis of hybrid was significant when it was used as female parent. The heat resistance of hybrids was similar to their female parents, but was better than that of their male parents.

Key words: lily (Lilium), temperature treatment, physiological indexes, electrical impedance spectroscopy, heat resistance, provenances