Phenotypic expression of precocity, heat-tolerance and fertility in intergroup hybrids of lilium

• Main Authors: Guo, Xiao Ying, 郭小鶯
• Other Authors: Xu, Zun Tu
• Format: Others
• Language: zh-TW
• Published: 1996
• Online Access: http://ndltd.ncl.edu.tw/handle/90096786922558564074

碩士 === 國立臺灣大學 === 園藝學研究所 === 84 === Seven intergroup hybrid lilies: NW × San-1, NW × San-2, #10 × San-1, #10 × PS-1, Km2 × Ast-10, Gelria × Ast-1 of L/A hybrid and LD × CB of L/O hybrid were used to be materials to evaluate precocity, earliness and heat tolerance. In rosette stage, there were 12 ~ 14 rosette leaves in L/A hybrids and 11 ~ 14 rosette leaves in L/O hybrid under 30/25 ℃ temperature regime for 16 weeks. The feature exhibited medium to high vigorness of rosette growth pattern. These hybrids emerge shoot and bloom by 7 ~ 8 monthes when they are under 25 ~ 35 ℃ temperature regimes while it was 10 ~ 11 monthes under 13 ~ 25 ℃ temperature regimes. This indicated that the high vigorness to rosette growth pattern and precocity were heredity dominant. In L/A hy In heat tolerance experiment, hybrids exhibited high vigorness to rosette growth under 25 ~ 35 ℃ temperature regimes and 100 ﹪ emerge shoot through natural cooling. The development of floral buds and anthesis were tolerated to 35/30 ℃ or hot summer condition. This indicated that these hybrids have exhibited heat tolerance and adapted to 35/30 ℃ to 15/13 ℃ temperature regimes. Heat tolerance feature combined with high vigorness to rosette growth would facilitate the yearound forcing culture. These intergroup hybrids also express highly sterility. In L/A hybrid NW × San-1, the percentage of chromosome pairing is 85 ~ 93 ﹪ and almost formed 11 II ＋ 2 I or 12 II. In contrary, the L/O hybrid LD × CB is almost formed 24 univalent, which indicated the relationship between Longiflorum and Asiatic hybrids is closer than Longiflorum and Oriental hybrids. It''s easier to recover sterility in L/O hybrid than L/A hybrid by chromosome doubling.