GENETIC AND MORPHOLOGICAL ANALYSIS OF A MAIZE TEOSINTE F2 POPULATION - IMPLICATIONS FOR THE ORIGIN OF MAIZE
GENETIC AND MORPHOLOGICAL ANALYSIS OF A MAIZE TEOSINTE F2 POPULATION - IMPLICATIONS FOR THE ORIGIN OF MAIZE
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DOI：
10.1073/pnas.87.24.9888
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发表时间：
1990-12-01
影响因子：
11.1
通讯作者：
EDWARDS, M
中科院分区：
文献类型：
--
作者：
DOEBLEY, J;STEC, A;EDWARDS, M
利用分子标记技术对玉米-大刍动物F2群体中控制玉米与其假定祖先大刍动物形态差异的基因进行了研究。结果表明，玉米和大刍草的关键性状均受多基因控制，但在某些性状上，如胚轴数，数据与一个主基因座加几个修饰子的遗传模式一致。对于其他性状，如有无花梗小穗，数据表明多基因遗传，没有一个位点的影响比其他位点大得多。结果还表明，被囊基因座（Tu）在玉米的起源中没有主要作用，尽管以前认为它参与了。影响玉米和大刍草形态差异的主要位点位于前4条染色体上。这些数据表明，大刍草和玉米之间的差异部分涉及发育上的改变，即：(1)大刍草的初级侧花序发育为穗状花序（雄性），在玉米中发育为穗状花序（雌性），以及(2)玉米中雄性第二性性状在雌性背景下的表达。类似的变化可能也涉及到玉米的起源。
Genes controlling the dramatic morphological differences between maize and its presumed progenitor (teosinte) were investigated in a maize-teosinte F2 population through the use of molecular markers. Results indicate that the key traits differentiating maize and teosinte are each under multigenic control, although for some traits, such as the number of ranks of cupules, the data are consistent with a mode of inheritance that would involve a single major locus plus several modifiers. For other traits, such as the presence/absence of the pedicellate spikelet, the data indicate multigenic inheritance with no single locus having a dramatically larger effect than the others. Results also indicate that the tunicate locus (Tu) had no major role in the origin of maize, despite previous opinion that it was involved. The major loci affecting the morphological differences between maize and teosinte are located on the first four chromosomes. The data suggest that the differences between teosinte and maize involve, in part, developmental modifications that enable (i) primary lateral inflorescences, which are programmed to develop into tassels (male) in teosinte, to become ears (female) in maize, and (ii) the expression of male secondary sex traits on a female background in maize. Similar changes were likely involved in the origin of maize.