The impact of cell division and cell enlargement on the evolution of fruit size in Pyrus pyrifolia.
The impact of cell division and cell enlargement on the evolution of fruit size in Pyrus pyrifolia.
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DOI：
10.1093/aob/mcl144
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发表时间：
2006-09
期刊：
影响因子：
4.2
通讯作者：
Caixi Zhang;K. Tanabe;Shiping Wang;F. Tamura;Akira Yoshida;Kazuhiro Matsumoto
中科院分区：
文献类型：
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作者：
Caixi Zhang;K. Tanabe;Shiping Wang;F. Tamura;Akira Yoshida;Kazuhiro Matsumoto
背景与目的随着梨树的驯化，果实大小急剧增加。为了评价细胞分裂和细胞扩大在果实大小进化中的作用，进行了以下研究。方法选择3个野生梨品种和46个栽培梨品种，在授粉时和果实采收时测定细胞数/大小。用细胞数增长模式的对数曲线估计细胞分裂周期，并分析其与成熟期和最终果实大小的相关性。关键结果最终果实大小与授粉后一段时间内产生的细胞数量直接相关。晚熟品种比早熟品种大，这是由于细胞分裂周期延长所致。结论鸭茅果实大小的进化主要是由于细胞分裂能力的改变，而不是细胞扩大能力的改变。
BACKGROUND AND AIMS Dramatic increases in fruit size have accompanied the domestication of Pyrus pyrifolia. To evaluate the contribution of cell division and cell enlargement in the evolution of fruit size, the following study was conducted. METHODS Three wild Pyrus and 46 cultivated Pyrus pyrifolia cultivars were selected to examine cell number/size at time of pollination and at time of fruit harvest. The period of cell division was estimated by logarithmic curve of the increasing pattern of cell number, and its correlations with maturation period and final fruit size were analysed. KEY RESULTS Final fruit size is directly related to the number of cells produced in the period immediately following pollination. Late-maturing cultivars are larger than earlier-maturing cultivars and this is due to an extended period of cell division. CONCLUSIONS The evolution of fruit size in P. pyrifolia has mainly resulted from shifts in the ability of cells to divide rather than to enlarge.