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已有 2814 次阅读 2013-1-29 08:46 |个人分类:自然与社会|系统分类:论文交流| 论文, SCI, 在线, 2013

Acta Physiol Plant
DOI 10.1007/s11738-013-1220-2
 
Cambium reactivation independent of bud unfolding involves de novo IAA biosynthesis in cambium regions in Populus tomentosa Carr.
 
Wan-Feng Li • Qi Ding • Ke-Ming Cui •Xin-Qiang He

Received: 4 December 2012 / Revised: 10 January 2013 / Accepted: 11 January 2013
 
Abstract Cambium reactivation of temperate trees in spring is important for adaptation and growth. In some trees, the resumption of cambium cell division occurs before bud flush. However, knowledge about the source of the internal stimuli that promote cambium cell division during reactivation in these trees is limited. Here, the anatomical changes of cambium during reactivation along with the unfolding of vegetative buds in Populus tomentosa were examined under natural and water-culture conditions. Meanwhile, the levels of free indole-3-acetic acid (IAA) and transcripts of enzymes involved in its production were measured during cambium reactivation. The results showed that cambium cell division occurred before bud unfolding during cambium reactivation in P. tomentosa. Interestingly, the levels of IAA and the transcripts of poplar homologs of aldehyde oxidase 2 and nitrilases 2 encoding enzymes functioning in de novo IAA biosynthesis increased before bud unfolding, while the transcript levels of IAA conjugate hydrolases almost showed no increase. These results suggest that free IAA from de novo biosynthesis in cambium regions promotes cambium reactivation before bud unfolding, providing new insights into the regulatory mechanism of cambium reactivation.


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