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《ACTA BOTANICA SINICA》 1999-01
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Comparison of Cytology, Apical Buds and Gutta Content Between Staminate and Pistillate of Eucommia ulmoides Trees

WANG Bing-Wu; WANG Ya-Qing; MO Hua; LUO Li-XinLI Mao-Xue; CUI Ke-Ming(College of Life Sciences,Peking University, Beijing 100871)  
Eucommia ulmoides Oliv. is a typical dioecious species, a plant with an approximately equal pro-portion of the staminate and pistillate trees, suggesting that the gene responsible for sex determination could belocated on the sex chromosomes. Nevertheless heteromorphous sex chromosomes were not found in their ovaryand anther cells. Homologus chroosome pairing and division regularly occurred during meiosis of the pollenmother cells and occasionally chromosome bridges, chain and ring tetravalents were observed in a few cells.However, the length and maximum diameter of the apical buds in the staminate trees were significantly morethan those in the pistillate trees throughout the budding process from mid-December to mid-April (P 0 .01 ).In contrast, the gutta content of the leaves in the pistillate trees was significantly much more than that in thestaminate trees (P 0.01 ). And in both staminate and pistillate trees, however, the gutta content graduallydecreased, in the same proportion between the staminate and pistillate trees, from April to October with theseasonal change and the growth of leaves. These indicated that the size of the buds and the amount of the leafgutta content in E. ulmoides were sex dependant. Since both of the gutta content and bud-size were quantitative characters which were usually controlled by multiple genes unlikely being all located on the sex chromosomes, it might be possible that some of the important genes controlling these two charactere could be linkedwith the genes responsible for sex determination.
【Fund】: 国家自然科学基金
【CateGory Index】: Q942
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