生长素对吊兰根负向光性的影响

Effects of IAA on the Negative Phototropism of Chlorophytum comosum Root

为了研究生长素对吊兰[Chlorophytum comosum(Thunb.)Baker]根系负向光性的影响,试验对处于不同浓度吲哚乙酸(Indole-3-acetic acid,IAA)溶液中受单侧光照射的吊兰根生长情况进行了研究。通过观察恒温条件下吊兰根的生长速率及负倾斜度,发现水培液中的IAA对吊兰根的生长和向光性反应有显著影响。低浓度的IAA促进根的生长,高浓度的IAA抑制根的生长;当IAA浓度为0.001 mg/L时,吊兰根的生长和弯曲最显著;当IAA的浓度达到10.000 mg/L时,吊兰根的生长和负向光性反应消失。由此证实根的负向光性受到内源与外源IAA的综合影响。

To explore the effects of IAA（Indole-3-acetic acid） on the negative phototropism of Chlorophytum comosum（Thunb.） Baker root,C.comosum was cultivated in different concentration of IAA solution with unilateral light illumination.The root growth rate and negative inclination of C.comosum were measured.The results showed that low concentration of IAA promoted root growth,but high IAA concentration inhibited root growth.When IAA concentration was 0.001 mg/L,the C.comosum showed the most obviously growth and bend.When the concentration of IAA solution was 10.000 mg/L,the phenomenon of negative phototropism disappeared.It was concluded that the root negative phototropism was affected by the comprehensive effect of the endogenous and exogenous IAA.