植物生长调节剂对水稻分蘖芽生长和内源激素变化的调控效应

摘要

Hormones have substantial effect on tiller bud growth of rice.However, little is known on the relation between endogenous hormonal changes and the growth of rice tiller bud induced by exogenous hormones.In present study, two rice cultivars (Yangdao 6 and Nanjing 44) were used to investigate the effect of exogenous ABA, GA3, and NAA on tiller bud outgrowth and the changes of endogenous hormones.The results showed that exogenous GA3 and NAA completely inhibited the tiller bud growth, while applied ABA did not, but ABA slowed the growth rate of it.Both exogenous GA3 and NAA increased the ABA contents and decreased the Z+ZR contents in tiller node and tiller bud, and exogenous GA3 increased the IAA content in tiller node, and IAA and Z+ZR changed earlier than ABA.In conclusion, IAA and Z+ZR may play key roles in regulating the growth of rice tiller bud, while ABA may not, although ABA can affect the growth velocity of tiller bud; the effect of exogenous hormones on rice tiller bud growth is through regulating the contents of ABA, IAA, and CTK in plants.%以扬稻6号和南粳44为材料,研究了外源ABA、GA3和NAA对水稻分蘖芽生长的影响及其与内源激素的关系.结果表明,外源GA3和NAA可以完全抑制分蘖芽的生长,而外源ABA只是减缓了分蘖芽的生长速率而没有完全抑制其生长.外源GA3和NAA均提高了分蘖节和分蘖芽中ABA含量,抑制了分蘖节和分蘖芽中Z+ZR含量的提高,而且外源GA3还提高了分蘖节中IAA含量,另外,IAA和Z+ZR含量的变化早于ABA含量的变化.分析试验结果表明,IAA、ABA和Z+ZR三种内源激素与水稻分蘖芽生长密切相关,IAA和Z+ZR是生长的主要调控因素,而ABA不是,外界因素对分蘖芽生长的调控主要通过调控这3种激素实现.