冬小麦生育中后期次生根特殊根毛的发生与形态结构

Formation,morphology,and structure of special root hairs on nodal roots of winter wheat (Triticum aestivum L.) in middle and late growing period

大田试验条件下,研究了冬小麦次生根特殊根毛的发生规律和形态结构特征。结果表明,拔节后次生根近植株基部根体上特殊根毛普遍发生,其在次生根根体上的分布可区分为集中区、适中区和稀少区。特殊根毛集中区根毛的长度、直径、密度分别均大于适中区和稀少区,其中,长度和密度的差异达极显著水平(P<0.01)。随着生育期推进,特殊根毛长度、直径和密度均呈下降趋势。大多数特殊根毛呈现出不同程度的扭曲、变形,根毛细胞突起和分枝现象较为普遍,特殊根毛细胞次生壁出现加厚现象。

Under conditions of the field experiments,formation,morphology and structure of special root hairs on wheat nodal roots were studied.The results showed that special root hairs formed widespread around the basal parts of wheat nodal roots after jointing stage and that distribution of special root hairs on a nodal root could be divided into the concentrated,the moderate,and the sparse segment.Length,diameter,and density of the special root hairs on the concentrated segments were greater or more than those on the moderate or sparse segments.Among those,differences both in length and density between different nodal root segments were extremely significant（P〈0.01）.Length,diameter,and density of the special root hairs decreased with advance in growing period.Most special root hairs were distorted and deformed to some extent,protruding or branching of root hair cells was a general phenomenon in middle and late growing period,and thickening of secondary walls of the special root hairs occurred.