棱果芥种子萌发特性及其与油菜种子萌发对比的研究

Study on Characteristics of Seed Germination of Syrenia siliculosa Andrz. and Comparison with Brassica chinensis L.

棱果芥生长于新疆北部荒漠及沙丘,对干旱环境有极强的适应性。研究了棱果芥(S.siliculosa)种子在不同处理条件下的萌发情况,并在PEG-6000、NaCl处理下与油菜种子进行对比。结果表明:棱果芥种子自然萌发率不超过31%;针刺种皮和GA3处理分别使棱果芥种子萌发率提高到60%和92%;光照和黑暗对棱果芥种子萌发率影响不显著;4℃低温处理下棱果芥种子萌发率大幅度降低。在与油菜种子的对比实验中,PEG-6000和NaCl处理,棱果芥种子萌发率均高于油菜,表现出较强的渗透胁迫耐受性。

The thesis studied the seed of Syrenia siliculosa Andrz. grows in the northest desert and dunes in Xinjiang, and the comparison of the germination to rape seed under the stress of PEG-6000 and NaCl. The result indicated the natural germination rate of Syrenia siliculosa Andrz. was less than 31%. However, acupunc- ture of seed coat and gibberellin treatment were used for dormancy breaking, and the seed germination rate increased to 60% and 92% respectively. Illumination or darkness had no effect on the seed germination rate, and under low temperature the seed germination rate decreased. In contrast with Brassica chinensis L. , higher seed germination rate under stress of either PEG-6000 or NaCl indicated that Syrenia siliculosa Andrz. was more tolerant to osmotic stess.