摘要
以条叶车前、伊犁绢蒿、涩芥、播娘蒿、异果芥和群心菜这6种粘液种子为研究材料,首先对其进行种子性状观测,然后将其置入永久性绵羊瘤胃瘘管内进行不同时间段的消化处理,并对处理前后的种子进行吸水率、粘沙率、粘液含量、萌发率等指标的测定,以期揭示这6种粘液种子对绵羊瘤胃消化的反应,并丰富有关植物种子消化道传播的内容。结果表明,这6种种子表层粘液物质都能被绵羊瘤胃液消化,且消化后的种子颜色变深。异果芥种子粘液构成其种翅附属结构,不同处理时间其宽度差异显著(P<0.05),长和高差异均不显著(P>0.05),而其他5种种子长、宽、高(厚)差异均不显著(P>0.05)。粘液量随消化时间的增加而减少,且二者之间符合形如y=-1.98+48.26e^(-x/8.40)(R^2=0.95441,P=0<0.01)的指数函数关系,随粘液量的减少,种子吸水率和粘沙率也减少,且二者随消化时间的变化分别符合形如y=90.04+428.03e^(-x/4.43)(R^2=0.75934,P=0<0.01)和y=-0.71+342.76e^(-x/5.05)(R^2=0.81124,P=0<0.01)的指数函数关系。消化后的粘液种子萌发率显著降低(P<0.05),可萌发种子集中在0~12 h处理时间段内,但仍有部分种子经消化道作用后成功"逃逸",这为草食动物对其进行消化道传播提供了可能。
An experiment has been undertaken to compare the morphological characteristics of mucilaginous seeds from six plant species（Plantago lessingii,Seriphidium transiliense,Malcolmia africana,Descuminia sophia,Diptychocarpus strictus and Cardaria draba） and to study their digestion in the rumen of sheep.After determining their morphological characteristics,seeds were put into nylon bags which were then placed in the rumen of sheep through a fistula.The bags were removed at different times and then the mucilage percentage,water absorption rate and sand adherence rate of the seeds were determined.The results were compared with seeds that had not been digested.The results showed that mucilage on the seed surface of all six species was digested by the rumen fluid of sheep.The seeds became dark after digestion.The seed wings of D.strictus consisted primarily of mucilage.As a result,the width of D.strictus seeds changed significantly as digestion time increased（P〈0.05）.In contrast,the length and thickness of D.strictus seeds were not significantly affected by digestion time（P〉0.05）.Digestion time had no significant effects on the length,width and thickness of seeds of the other five plant species（P〉0.05）.The mucilage percentage,water absorption rate and sand adherence rate decreased as digestion time increased.The relationship between mucilage percentage and digestion time is expressed as the equation y=-1.98 ＋ 48.26e^-x/8.40,where x is time in hours（R^2= 0.95441,P=00.01）.The relationship between water absorption rate and digestion time is expressed by the equation y=90.04 ＋ 428.03e^-x/4.43（R^2= 0.75934,P=00.01）.The relationship between sand adherence rate and digestion time is expressed as the equation y=-0.71 ＋ 342.76e^-x/5.05（R^2= 0.81124,P=00.01）.Seed germination rates decreased significantly after digestion（P〈0.05）,with the largest decreases occurring when digestion time was〉12 h.Although seed germinability decreased after passage through the rumen,the survival of some se
出处
《草业学报》
CSCD
北大核心
2017年第4期89-98,共10页
Acta Prataculturae Sinica
基金
国家自然科学基金(31360568
31560659)资助
关键词
粘液种子
瘤胃消化
形态特征
吸水率
粘沙
萌发
消化道传播
mucilaginous seeds
rumen digestion
morphological characteristics
water absorption
sand-holding capacity
germination
endozoochore
