少花蒺藜草开花习性与种子萌发特性研究

摘要

通过对少花蒺藜草小穗结构与分布、小花开花习性的观测表明:少花蒺藜草是雄花两性花植物,每小穗由两朵小花构成,第一朵小花是两性花,第二小花是雄性花.自花传粉是其主要的授粉方式,小花沿着穗顶部依次向下开放,具有2个小穗的刺苞在穗部所占比例为61.88%.种子的生长部位和大小影响其发芽率、平均发芽速度.去除刺苞中成熟较晚的小穗可提高成熟较早的小穗中种子的发芽率,而去除刺苞中成熟较早的小穗不会影响成熟较晚的种子的发芽率,但种子变成狭长形.%Cenchrus pauciflorus was investigated on flowering behavior and seed germination for the purpose of understanding biological characteristics and the weed control.C.pauciflorus is andromonoecious and self-pollination plant.Each spikelet has 2 florets.The first floret is hermaphrodite and the second is male floret.The floret opening order is usually from top down to basal.The percentage of the bur with double spikelets was 61.88％ in the spikes.The position and size of seeds affect germination percentage and average germination speed.The seed of first spikelet got more germinating rate when the second spikelet had been removed in flowering period,while the seed of second spikelet developed well when the first spikelet had been removed in flowering period, but the shape of seed got long and narrow.