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本文以狼毒(Stellera chamaejasme)为供体植物,探讨其根、茎叶水浸液对草原伴生种山韭(Allium senescens)种子发芽与幼苗生长的影响,为狼毒对牧草化感作用的研究提供新材料,并为揭示其对山韭的化感作用机制提供理论参考。结果表明:狼毒根、茎叶水浸液对山韭种子发芽具有抑制作用,且随浓度的增加逐渐增强,发芽率分别降低了43.94%和87.13%;狼毒根、茎叶水浸液对山韭种子胚根、胚芽及幼苗的生长具有“低促高抑”的化感作用,即低浓度(0.5,5和10 mg·mL-1)促进,高浓度(20和50 mg·mL-1)抑制;化感效应指数表明,狼毒茎叶水浸液对山韭种子发芽的化感抑制作用强于根水浸液;对山韭种子胚根、胚芽及幼苗生长的化感作用表明,低浓度根水浸液的化感促进作用强于茎叶水浸液,而高浓度茎叶水浸液的化感抑制作用强于根水浸液。研究说明了狼毒对山韭不同的生长阶段均存在一定的化感作用,且与其部位的化感效应存在规律性变化。 相似文献
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Fourteen interspecific hybrids in sexual diploid Allium senescens var. minor× apomictic tetraploid Allium nutans L. crosses, and eight interspecific hybrids in sexual diploid A. senescens var. minor× apomictic hexaploid A. senescens L. crosses were produced. The number of chromosomes was 2n= 24 in interspecific hybrids of diploid × tetraploid, and 2n= 32 in diploid × hexaploid crosses. Triploid and tetraploid interspecific hybrids showed intermediate parental morphological characteristics. Tetraploid interspecific hybrids of A. senescens var. minor×A. senescens crosses formed two groups based on leaf colour and leaf width. Seeds were formed in 11 out of 14 triploid interspecific hybrids under natural conditions. In cytological observations of parthenogenesis, three out of 12 triploid interspecific hybrids and five out of eight interspecific tetraploid hybrids were observed. Parthenogenesis ranged from 26.0% to 86.0% in five tetraploid interspecific hybrids. Non-parthenogenesis to parthenogenesis segregated in a 3:5 ratio in A. senescens var. minor×A. senescens crosses. 相似文献
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本研究通过不同浓度的脱落酸(Abscisicacid,ABA)和赤霉素(Gibberellins,GA3)浸种,研究其对山韭(Allium senescens L.)种子萌发特征的影响及促进萌发的生理变化规律。结果表明:100 mg·L-1 ABA和100 mg·L-1 GA3处理显著提高了山韭种子的发芽率、发芽势、胚芽长、胚根长和胚芽胚根的鲜重(P<0.05)。与施加蒸馏水处理相比,ABA和GA3处理均显著提高了可溶性蛋白含量、脂肪酶和蛋白酶活性(P<0.05);100 mg·L-1 GA3处理显著提高了山韭胚芽乙烯(Ethrel,ETH)含量和ABA含量(P<0.05),100 mg·L-1 ABA处理显著增加了山韭胚芽GA3的含量而显著降低了ABA含量(P<0.05)。主成分分析和相关性分析表明:山韭种子发芽率、发芽指数和活力指数与可溶性蛋白、可溶性糖含量以及酶活性之间显著正相关。100 mg·L-1 ABA和100 mg·L-1 GA3对山韭种子的萌发及生长均具有显著的促进作用,ABA处理通过提高山韭胚芽内源GA3含量促进种子萌发,GA3处理通过提高山韭胚芽内源ETH含量促进种子萌发。 相似文献
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