Effects of external ABA, GA3 and NAA on the tiller bud outgrowth of rice is related to changes in endogenous hormones

被引：46

作者：

Liu, Yang ^{[1
]}

Wang, Qiangsheng ^{[1
]}

Ding, Yanfeng ^{[1
]}

Li, Ganghua ^{[1
]}

Xu, Junxu ^{[1
]}

Wang, Shaohua ^{[1
]}

机构：

[1] Nanjing Agr Univ, Agron Coll, Key Lab Crop Physiol & Ecol So China, Minist Agr, Nanjing 210095, Peoples R China

来源：

PLANT GROWTH REGULATION | 2011年 / 65卷 / 02期

基金：

中国国家自然科学基金;

关键词：

Abscisic acid; Cytokinin; Indole-3-acetic acid; Rice (Oryza sativa L.); Tiller bud; APICAL DOMINANCE; TRANSGENIC TOBACCO; AUXIN; ACID; CYTOKININS; GROWTH;

D O I：

10.1007/s10725-011-9594-x

中图分类号：

Q94 [植物学];

学科分类号：

071001 ;

摘要：

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 (GA(3)) and a-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 GA(3) 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.

引用

页码：247 / 254

页数：8

共 31 条

[11] EFFECTS OF KINETIN ON TILLER BUD ELONGATION IN WHEAT (TRITICUM-AESTIVUM L) [J].