IAA、GA<sub>3</sub>和ABA对稻根负向光性和生长的影响

IAA、GA₃和ABA对稻根负向光性和生长的影响

刘大同, 荆彦平, 史海翔, 钟婷婷, 王忠^*

Impact of IAA, GA₃, and ABA on Negative Root Phototropism and Root Growth of Rice

LIU Da-Tong, JING Yan-Ping, SHI Hai-Xiang, ZHONG Ting-Ting, WANG Zhong^*

图4 单侧光照下IAA处理对根系发育的影响 A: 单侧光照下IAA浓度梯度对扬稻6号种子根系生长的影响;随外源IAA浓度增加, 根的生长和负向光性弯曲被抑制。1~3有大量根毛发生。B: 扫描电镜观察的扬稻6号种子根表皮和根毛的发生, 1: IAA处理前的根表皮和根毛发生; 2: 经过IAA处理后新长出的根的表皮和根毛。C: 单侧光照下IAA浓度梯度对OsPIN1a种子根系生长的影响。随外源IAA浓度增加, 根的生长和负向光性弯曲被抑制, 且无明显的根毛发生。A, C中1~6是各自相互对应的处理, IAA浓度分别为1: 对照0, 2: 0.1 #cod#x000b5;mol L -1 , 3: 1 #cod#x000b5;mol L -1 , 4: 10 #cod#x000b5;mol L -1 , 5: 100 #cod#x000b5;mol L -1 , 6: 1000 #cod#x000b5;mol L -1 , bar=1 cm。
Fig. 4 Development of root system under unilateral illumination with IAA treatment A: Influences of IAA gradient on the growth of Yangdao 6 seedling roots under unilateral illumination. With the increase of exogenous IAA concentration, root growth and negative phototropic bending were inhibited. 1-3: Root hair was greatly improved. B: Yangdao 6 observed by SEM. 1: Epidermis and root hairs on the pretreatment part; 2: Epidermis and root hairs after treatment. C: Influences of IAA gradient on the growth of OsPIN1a seedling roots under unilateral illumination. With the increase of exogenous IAA concentration, root growth and negative phototropic bending were inhibited. And there was no obvious root hair formation. 1-6 in A and C show the concentrations of IAA. 1: control; 2: 0.1 #cod#x000b5;mol L -1 ; 3: 1 #cod#x000b5;mol L -1 ; 4: 10 #cod#x000b5;mol L -1 ; 5: 100 #cod#x000b5;mol L -1 ; 6: 1000 #cod#x000b5;mol L -1 , bar=1 cm.