顶芽、节数和埋藏深度对六种沉水植物断枝再生能力的影响

Effects of apical tip,node number and burial depth on fragment regeneration of six submerged plants

研究了顶芽、节数和埋藏深度对穗花狐尾藻、黑藻、篦齿眼子菜、菹草、金鱼藻和轮藻等6种沉水植物断枝再生能力的影响.结果表明,顶芽显著抑制了菹草的断枝再生能力,但是对其它5种植物没有显著影响;随着节数增加,断枝萌生再生枝和根的能力显著增强,总体上,5节以上的断枝具有明显更强的再生能力;穗花狐尾藻和6节以下的黑藻在埋藏条件下没有再生能力,其它物种在1 cm和2 cm埋藏条件下仍具有较强的再生能力;6种沉水植物的断枝再生能力存在明显差异;同一物种的枝和不定根的再生能力也存在明显的不平衡,金鱼藻和轮藻具有最强的萌生再生枝的能力,然而两者在实验期间不能形成不定根.

The effects of apical tip,node number and burial depth on regeneration abilities of vegetative fragments of six submerged plant species Myriophyllum spicatum,Hydrilla verticillata,Potamogeton pectinatus,P.crispus,Ceratophyllum demersum and Chara spp.,were conducted.The results showed no significant changes occurred in the numbers of regenerated shoots and roots on fragments decapitated compared with the fragments with apices,except apical fragments of P.crispus had significantly lower regeneration abilities.The increased numbers of nodes significantly enhanced the regeneration abilities of shoots and roots generally,and the fragments with above five nodes regenerated better than others.The fragment of M.spicatum and less than six-node of H.verticillata were able to regenerate new shoots and roots only at 0cm burial depth,while the other four species were able to regenerate new shoots and/or roots at depths of 1cm and 2cm.Fragment regeneration abilities varied markedly both within and between the species.Both C.demersum and Chara spp.had the highest regeneration ability of shoots,but failed to regenerate roots.