扁穗牛鞭草无性繁殖根系形成发育多样性的研究

研究了15份扁穗牛鞭草资源无性繁殖单株根系的形成时间及发育过程。结果表明:①根形成时间存在着差异,初生根和次生根形成时间的变异系数分别为32.36%、20.90%;②根系入土深度在苗期、成苗期、成株期存在着差异,变异系数分别为70.39%、35.36%、19.81%;③根系分布范围在成苗期、成株期存在着差异,变异系数分别为58.03%、37.56%;④成株期根系重量有差异,变异系数为58.03%;⑤成苗期根系深度与分布范围存在极显著正相关(R=0.76530),苗期根数与成苗期根系深度呈极显著负相关(R=-0.68871),与成株期根系分布范围呈显著负相关(R=-0.58941),成苗根系深度与成苗根系分布范围呈极显著正相关(R=0.74745),成苗根系分布范围与成株根系分布范围呈极显著正相关(R=0.82279)。

Diversity about Formation and Growth of Root System for Cloning Genet of Hemarthria Compressa

In this study,the formation and growth of root system of clonal genets of 15 Hemarthria Compressa accessions was tested and analyzed. The result showed that:①There was a difference in root emergence time,after marinated the clonal material in water,and the variation coefficients of the primary root emergence time and that of secondary root were 32.36 % and 20.9 %,respectively.②In the stage of infancy in field,young plant and adulthood,the depth of root system exists difference,and the variation coefficients were 70.39 %,35.36 % and 19.81 %,respectively.③In the stage of young plant and adulthood,the distribution scope of root system is different,and the variation coefficients are 58.03 % and 37.56 %,respectively.④The weight of plant root system was also different,and the variation coefficient was 58.03 %.⑤In the stage of young plant,the depth of root system was highly positive correlative to its distribution scope(R=0.765 30),the number of infancy root was significantly negative correlative to the depth of young plant root system(R=-0.688 71),and was negative correlative to the distribution scope of adulthood root system(R=-0.589 41),the depth of adulthood root system was highly correlative to its distribution scope(R=0.747 45),and the distribution scope of young plant root system was significantly correlative to that of adulthood root(R=0.822 79).