科研之友
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摘要
Trees owe their growth in girth to cambial activity that gives rise to secondary conducting tissues Since cambium originates from the primary vascular meristem called procambium, the main objective of the present study was to analyse the changes occurring during transition from procambium to cambium in Diospyros lotus L characterized by the occurrence of double-storied cambium In this species procambium and primary vascular tissues are present only within the bud, whereas just below this level, cambium and secondary vascular tissues occur Procambium differentiates as a continuous cylinder which as a whole transforms Into cambium during further development Commonly used criteria distinguishing procambium and cambium - that is the appearance of periclinal divisions, intrusive growth of meriste mane cells, presence of rays and primary versus secondary nature of derived vascular tissues - were analysed in D lotus All these features, however were present in procambium, making the sharp distinction between both stages of vascular meristem based on these criteria difficult In addition, the formation of fusiform and ray initial storeys in D lotus was shown to appear in the third year of cambium activity and become more distinct with cambium age The double stoned structure may result from the genetic control of cell fate and (or) the presence of epigenetic patterns determining cellular arrangement
- 出版日期2010-11
