Dormancy genes from weedy rice respond divergently to seed development environments
Dormancy genes from weedy rice respond divergently to seed development environments
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DOI：
10.1534/genetics.105.049155
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发表时间：
2006-02-01
期刊：
影响因子：
3.3
通讯作者：
Foley, ME
中科院分区：
文献类型：
--
作者：
Gu, XY;Kianian, SF;Foley, ME
与种子发育环境相互作用的基因控制着最初的休眠。为了了解杂草水稻多基因系统如何进化以适应不断变化的环境，我们在一个同步的非休眠遗传背景中评估了三个休眠QTL的遗传成分。分离qSD1、qSDZ-1和qSD12的两个遗传相同的群体在温室和自然条件下生长，在种子发育过程中温度、相对湿度和光照强度不同。在这两种情况下，低温都有加强休眠的趋势。然而，不同的基因型对环境的反应不同，因此两个种群的萌发表现出相似的分布。这三个座位的加性和/或显性效应可以解释90%的遗传方差，它们的上位性可以解释每种环境中剩余的遗传方差。在较低温度下，qSD1和qSD7-1的主效作用增强，qSD12的加性效应减弱。G×E互作既涉及基因主效应，又涉及上位性效应，其幅度大于环境序列效应。分歧者。在这个简单的多基因系统中观察到的休眠基因的反应可能在适应环境变化的自然种群中具有选择性优势，因此代表了一种稳定不同季节或不同温度条件下成熟的杂草水稻休眠水平的遗传机制。
Genes interacting with seed developmental environments control primary dormancy. To understand how a multigenic system evolved to adapt to the changing environments in weedy rice, we evaluated genetic components of three dormancy QTL in a synchronized nondormant genetic background. Two genetically identical populations segregating for qSD1, qSDZ-1, and qSD12 were grown under greenhouse and natural conditions differing in temperature, relative humidity, and light intensity during seed development. Low temperatures tended to enhance dormancy in both conditions. However; genotypes responded to the environments divergently so that two populations displayed similar distributions for germination. Additive and/or dominance effects of the three loci explained similar to 90% of genetic variances and their epistases accounted for the remainder in each environment. The qSD1 and qSD7-1 main effects were increased, while the qSD12 additive effect was decreased by relatively low temperatures. Both gene main and epistatic effects were involved in G X E interactions, which in magnitude were greater than environmental train effect. The divergent. responses of dormancy genes observed in this simple multigenic system presumably have selective advantages in natural populations adapted to changing environments and hence represent a genetic mechanism stabilizing the dormancy level of weedy rice ripened in different seasons or temperature regimes.