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TIME FOR COFFEE controls root meristem size by changes in auxin accumulation in Arabidopsis  


×÷Õß:Hong, LW (Hong, Li-Wei)[ 1 ] ; Yan, DW (Yan, Da-Wei)[ 1 ] ; Liu, WC (Liu, Wen-Cheng)[ 1 ] ; Chen, HG (Chen, Hong-Guo)[ 2 ] ; Lu, YT (Lu, Ying-Tang)[ 1 ]  




JOURNAL OF EXPERIMENTAL BOTANY



¾í: 65

ÆÚ: 1

Ò³: 275-286

DOI: 10.1093/jxb/ert374

³ö°æÄê: JAN 2014

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Roots play important roles in plant survival and productivity as they not only anchor the plants in the soil but are also the primary organ for the uptake of nutrients from the outside. The growth and development of roots depend on the specification and maintenance of the root meristem. Here, we report a previously unknown role of TIME FOR COFFEE (TIC) in controlling root meristem size in Arabidopsis. The results showed that loss of function of TIC reduced root meristem length and cell number by decreasing the competence of meristematic cells to divide. This was due to the repressed expression of PIN genes for decreased acropetal auxin transport in tic-2, leading to low auxin accumulation in the roots responsible for reduced root meristem, which was verified by exogenous application of indole-3-acetic acid. Downregulated expression of PLETHORA1 (PLT1) and PLT2, key transcription factors in mediating the patterning of the root stem cell niche, was also assayed in tic-2. Similar results were obtained with tic-2 and wild-type plants at either dawn or dusk. We also suggested that the MYC2-mediated jasmonic acid signalling pathway may not be involved in the regulation of TIC in controlling the root meristem. Taken together, these results suggest that TIC functions in an auxinPLTs loop for maintenance of post-embryonic root meristem.


¹Ø¼ü´Ê

×÷Õ߹ؼü´Ê:Arabidopsis thaliana; auxin; circadian clock; jasmonic acid; MYC2; PIN; root meristem; TIME FOR COFFEE

KeyWords Plus:STEM-CELL NICHE; BHLH TRANSCRIPTION FACTORS; JASMONATE RESPONSES; GROWTH; EXPRESSION; TRANSPORT; THALIANA; GENES; MYC2; DIFFERENTIATION


×÷ÕßÐÅÏ¢

ͨѶ×÷ÕßµØÖ·: Lu, YT (ͨѶ×÷Õß)

Wuhan Univ, Coll Life Sci, Wuhan 430072, Peoples R China.




µØÖ·:  

[ 1 ] Wuhan Univ, Coll Life Sci, Wuhan 430072, Peoples R China


       [ 2 ] Hubei Univ Sci & Technol, Coll Chem & Biol, Xianning 437100, Hubei Province, Peoples R China


µç×ÓÓʼþµØÖ·:yingtlu@whu.edu.cn


»ù½ð×ÊÖúÖÂл


»ù½ð×ÊÖú»ú¹¹

ÊÚȨºÅ

National Natural Science Foundation of China  
90917001

Chinese Ministry of Education  
311026

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OXFORD UNIV PRESS, GREAT CLARENDON ST, OXFORD OX2 6DP, ENGLAND


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Ñо¿·½Ïòlant Sciences

Web of Science Àà±ðlant Sciences


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ÎÄÏ×ÀàÐÍ:Article

ÓïÖÖ:English

Èë²ØºÅ: WOS:000329868000022

ISSN: 0022-0957

µç×Ó ISSN: 1460-2431


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Impact Factor (Ó°ÏìÒò×Ó):  Journal Citation Reports®


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IDS ºÅ: 291YE

Web of Science ºËÐĺϼ¯ÖÐµÄ "ÒýÓõIJο¼ÎÄÏ×": 50

Web of Science ºËÐĺϼ¯ÖÐµÄ "±»ÒýƵ´Î": 0
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