Study on characteristics of growth and development in seedling progeny of Lilium regale | 岷江百合实生后代生长发育特性的研究

Chinese. 研究岷江百合实生后代的生长发育特性，为岷江百合的实生繁殖、杂交育种及品种选育提供依据。以岷江百合4、5年生实生后代为材料，对其在日光温室和露地2种栽培环境下的生长发育规律、植株形态进行定期实地观测。在露地环境下，岷江百合实生后代萌芽时间较日光温室晚22 d左右，但在2种栽培环境下，生长停止时间基本一致。同一栽培环境下，5年生岷江百合实生后代叶片数和叶面积显著大于4年生实生后代；同一生长年限，日光温室内岷江百合株高、茎粗、叶片数、叶面积、花冠横径及内侧和外侧花瓣长大于露地，且差异显著；露地4、5年生岷江百合实生后代群体现蕾率、开花率分别较日光温室内高9.6%，1.4%和4.5%，3.5%，但其单株多花率分别低于日光温室6.1%和13.5%；日光温室和露地5年生岷江百合实生后代现蕾率、开花率分别较4年生高30.3%，6.4%和25.2%，8.5%，单株多花率较4年生分别高25.9%和18.5%。岷江百合实生后代在露地环境下较日光温室内更易度过童期；2种栽培环境下，4年生实生后代的营养生长较5年生实生后代旺盛，群体生长到第5年仍然没有完全度过童期。

English. The growth characteristics of the seedling progeny of Lilium regale were observed to provide theoretical basis for rational seedling propagation, hybridization and variety breeding. The growth dynamicsand phenotypic characters of four or five-year seedling progenies of L. regale cultivate in solar greenhouse and open field were measured and analyzed by field observation. The budding time of seedling progenies in open field was 22 d earlier than in solar greenhouse, nevertheless their ripening time was almost the same. Under the same cultivation environment, leaf number and leaf area in each 5-year-old seedling progenies were obviously bigger than those of 4-year-old plants. In each growth year, significant differences were found between the seedling progenies growing in solar greenhouse and open field, with the former showing a higher statistical data in terms of plant height, stem diameter, leaf number, leaf area, width of corolla and length of outer-layer and inner-layer petals. Furthermore, squaring rate and blooming rate corresponding to four-and five-year seedling progenies in open field were 9.6%, 1.4% and 4.5%, 3.5% higher than those in solar greenhouse respectively, though the percentages of plant with more than one flower were 6.1% and 13.5% lower. Similarly, squaring rate and blooming rate of five-year plants cultivated in solar greenhouse and open field were 30.3%, 6.4% and 25.2%, 8.5% higher, also the proportions of plant with more than one flower were 25.9% and 18.5% higher than those of four-year plants. In contrast to solar greenhouse, seedling progenies growing in open field were easier to get through the juvenile phase, and vegetative growth was more vigorous of fourth year than fifth year of seedling progenies in both cultivation environments. On the fifth year, not all the individuals of the population have fully passed through juvenile phase yet.