迁地条件下新疆大叶苜蓿花部综合征的比较分析

Comparison and Analysis on Floral Integration Features of Medicago sativa L.cv.Xinjiang Daye under Migration Condition

对不同生长区域的新疆大叶苜蓿花部综合征进行比较分析,结果显示:(1)迁地条件下的苜蓿花期较原生长地推迟10d左右。(2)迁地条件下每单花胚珠数为(9.5±0.61),提供给传粉者的报酬为(4454±463)花粉粒和(0.32±0.08)μl/d花蜜,花粉败育率达(38.7±2.4)%,花粉传递效率P/O值为(472.56±52.24)。原生长地每单花胚珠为(11.8±0.7)个,提供的报酬为(3213±250)粒花粉和(0.95±0.06)μl/d花蜜,花粉败育率为(17.07±2.29)%,P/O值为(272.86±30.12)。在原生长地,大叶苜蓿较高的花蜜量可能限制了花粉的发育,使得苜蓿单花的花粉数量明显低于迁地条件下的花粉数量。而花粉的败育一定程度上归因于花粉发育过程中环境因素的影响。(3)迁地条件下,构成苜蓿花部综合征的诸因素均发生了显著性变化,环境和气候条件的变化是导致上述差异的主要原因。

The study on floral integration features of Medicago sativa L. cv. Xinjiang Daye was carried out with different areas planted. The results showed that： （1） under migration condition, the florescence put off about 10 days. （2） Compared with original growth area, a flower of alfalfa planted in the migration area could provide 4454±463 pollen grains, 0.32± 0. 08 μl/d of nectar, and the number of ovule was 9.5± 0.61, the pollen abortion percentage was 38.7±2.4%, the pollen-ovule ratios（P/O） was 472.56±52.24. In original growth area, a flower could provide 3213±250 pollen grains, 0. 95±0. 06 μl/d of nectar, and the number of ovule was 11.8±0.7, the pollen abortion percentage was 17.07± 2.29 %, the pollen-ovule ratio（P/O） was 272.86±30. 12. In the original growth area , the lower pollen grains amount probably due to the higher nectar amount of single flower which limited the development of pollen because of holding over resource . The pollen abortion due to the environment factors in a certain extent. （3） Under migration condition, the main elements composing floral integration features had a change significantly. The change of environment and weather conditions among the different alfalfa growing areas leaded to the diversification of floral integration features of alfalfa.