喜盐鸢尾种子休眠与萌发特性初步研究

喜盐鸢尾(Iris halophila）是一种干旱地区野生观赏花卉，种子萌发困难，限制了该种在园林绿化中的应用，也为育种工作带来难度。从吸水性和萌发性两个方面对喜盐鸢尾种子休眠原因和打破休眠的方法进行了探索。研究表明，在25/10 ℃（高温/低温）条件下，喜盐鸢尾种子萌发率最高，达到44.33%；胚乳中的萌发抑制物质是限制喜盐鸢尾种子萌发的主要原因；种皮可限制胚乳萌发抑制物质的释放。砂纸摩擦、切除部分胚乳和赤霉素(GA3)处理都能提高种子的萌发率。综合考虑经济费用和可操作性等因素，砂纸摩擦后蒸馏水浸种处理是打破喜盐鸢尾种子萌发行之有效的方法。

Dormancy and Germination of Iris halophila Seeds

Iris halophila is an ornamental flower species distributed in arid regions, the germination percentage of its seeds is low, which causes a difficulty in its breeding, and the landscape application of this plant is severely constrained. The purpose of this study was to understand the dormancy ofI. halophila seeds through conducting the absorbent and germination experiments. The results revealed that 25/10 ℃ was the most suitable temperature for germination of I. halophila seeds, and a germination rate of 44.33% was attained; it was considered that the germination inhibitory substances in endosperm may be the main factor restricting the germination of I. halophila seeds; seed coat may mechanically restrict the release of inhibitory substances in endosperm; the seed germination percentage could be increased through scarification and removal of endosperm and GA3, and scarification would be the best way of improving the germination of I. halophila seeds.