caa a22 4500 445841958 CHVBK 20180317145347.0 cr unu---uuuuu 170323e20111101xx s 000 0 eng 10.1007/s10725-011-9594-x doi (NATIONALLICENCE)springer-10.1007/s10725-011-9594-x Effects of external ABA, GA3 and NAA on the tiller bud outgrowth of rice is related to changes in endogenous hormones [Elektronische Daten] [Yang Liu, Qiangsheng Wang, Yanfeng Ding, Ganghua Li, Junxu Xu, Shaohua Wang] Hormones play an important role in regulating the growth of rice tiller buds. However, little is known about the hormonal changes that occur during tiller bud growth and the mechanism of hormonal regulation of tiller bud growth. Here, two rice cultivars, Yangdao 6 (Indica) and Nanjing 44 (Japonica), were used to investigate the changes in plant hormones during tiller bud growth and the mechanism that underlies the hormonal regulation of tiller bud growth. In the present study, panicles were removed after heading to stimulate the growth of dormant tiller buds located at the elongated upper internodes. At the same time, external abscisic acid (ABA), gibberellic acid (GA3) and α-naphthalene acetic acid (NAA) were applied. The results demonstrated that auxin and cytokinin (CTK) play important and different roles in the regulation of tiller bud growth. Auxin in the nodes inhibits tiller bud growth, while CTK is transferred to the tiller buds to promote growth. The inhibitory effects of GA3 and NAA on tiller bud growth are mainly due to the control of the indole-3-acetic acid (IAA) or CTK contents in plants. As opposed to auxin and CTK, the ABA contents in nodes and tiller buds remained unchanged before tiller bud growth after panicle removal. Meanwhile, external ABA application only slightly slowed the growth of the tiller buds, suggesting that ABA may not be a key regulator of tiller bud growth. These results indicate that auxin, CTK and ABA together likely play roles in the regulation of tiller bud growth. Springer Science+Business Media B.V., 2011 Abscisic acid nationallicence Cytokinin nationallicence Indole-3-acetic acid nationallicence Rice ( Oryza sativa L.) nationallicence Tiller bud nationallicence CTK : Ctyokinin nationallicence NAA : α-Naphthalene acetic acid nationallicence ABA : Abscisic acid nationallicence GAs : Gibberellic acids nationallicence Z+ZR : Zeatin+zeatin riboside nationallicence iP+iPR : Isopentenyladenine+isopentenyladenine riboside nationallicence IAA : Indole-3-acetic acid nationallicence NSC : Non-structural carbohydrates nationallicence N : Nitrogen nationallicence Liu Yang Agronomy College, Nanjing Agricultural University/Key Laboratory of Crop Physiology and Ecology in Southern China, Ministry of Agriculture, 210095, Nanjing, China aut Wang Qiangsheng Agronomy College, Nanjing Agricultural University/Key Laboratory of Crop Physiology and Ecology in Southern China, Ministry of Agriculture, 210095, Nanjing, China aut Ding Yanfeng Agronomy College, Nanjing Agricultural University/Key Laboratory of Crop Physiology and Ecology in Southern China, Ministry of Agriculture, 210095, Nanjing, China aut Li Ganghua Agronomy College, Nanjing Agricultural University/Key Laboratory of Crop Physiology and Ecology in Southern China, Ministry of Agriculture, 210095, Nanjing, China aut Xu Junxu Agronomy College, Nanjing Agricultural University/Key Laboratory of Crop Physiology and Ecology in Southern China, Ministry of Agriculture, 210095, Nanjing, China aut Wang Shaohua Agronomy College, Nanjing Agricultural University/Key Laboratory of Crop Physiology and Ecology in Southern China, Ministry of Agriculture, 210095, Nanjing, China aut Plant Growth Regulation Springer Netherlands 65/2(2011-11-01), 247-254 0167-6903 65:2<247 2011 65 10725 https://doi.org/10.1007/s10725-011-9594-x text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10725-011-9594-x text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Liu Yang Agronomy College, Nanjing Agricultural University/Key Laboratory of Crop Physiology and Ecology in Southern China, Ministry of Agriculture, 210095, Nanjing, China aut NATIONALLICENCE 700 1- Wang Qiangsheng Agronomy College, Nanjing Agricultural University/Key Laboratory of Crop Physiology and Ecology in Southern China, Ministry of Agriculture, 210095, Nanjing, China aut NATIONALLICENCE 700 1- Ding Yanfeng Agronomy College, Nanjing Agricultural University/Key Laboratory of Crop Physiology and Ecology in Southern China, Ministry of Agriculture, 210095, Nanjing, China aut NATIONALLICENCE 700 1- Li Ganghua Agronomy College, Nanjing Agricultural University/Key Laboratory of Crop Physiology and Ecology in Southern China, Ministry of Agriculture, 210095, Nanjing, China aut NATIONALLICENCE 700 1- Xu Junxu Agronomy College, Nanjing Agricultural University/Key Laboratory of Crop Physiology and Ecology in Southern China, Ministry of Agriculture, 210095, Nanjing, China aut NATIONALLICENCE 700 1- Wang Shaohua Agronomy College, Nanjing Agricultural University/Key Laboratory of Crop Physiology and Ecology in Southern China, Ministry of Agriculture, 210095, Nanjing, China aut NATIONALLICENCE 773 0- Plant Growth Regulation Springer Netherlands 65/2(2011-11-01), 247-254 0167-6903 65:2<247 2011 65 10725 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer