Identification of Novel Loci Regulating Interspecific Variation in Root Morphology and Cellular Development in Tomato
Identification of Novel Loci Regulating Interspecific Variation in Root Morphology and Cellular Development in Tomato
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DOI：
10.1104/pp.113.217802
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发表时间：
2013-06-01
期刊：
影响因子：
7.4
通讯作者：
Brady, Siobhan M.
中科院分区：
文献类型：
--
作者：
Ron, Mily;Dorrity, Michael W.;Brady, Siobhan M.
虽然拟南芥（Arabidopsis thaliana）根已经被优雅地描述为细胞身份的规范，但它的发育缺少其他物种中存在的一些细胞特征。我们表征了野生和驯化番茄物种：潘内利番茄和番茄M82的根发育。“我们发现这些物种在根形态和细胞发育方面存在广泛差异，包括根长度，新的重力设定点角度，皮层细胞层模式，干细胞生态位结构和径向细胞分裂的差异。使用这两个物种之间的渐渗系群体，我们确定了许多基因座，调节这些不同方面的发展。具体而言，我们全面鉴定了通过不同机制调节（1）根长度的基因座，所述不同机制包括调节分生组织内的细胞产生以及细胞分裂和扩展之间的平衡，（2）重力设定点角，以及（3）特定细胞类型中或通常跨多种细胞类型的径向细胞分裂或扩展。我们的研究结果提供了一个新的角度调节根的生长和发育的物种之间。这些基因座具有令人兴奋的意义，调节抗旱性或耐盐性和调节根的发展，在一个家庭，经历了驯化。
While the Arabidopsis (Arabidopsis thaliana) root has been elegantly characterized with respect to specification of cell identity, its development is missing a number of cellular features present in other species. We have characterized the root development of a wild and a domesticated tomato species, Solanum pennellii and Solanum lycopersicum 'M82.' We found extensive differences between these species for root morphology and cellular development including root length, a novel gravity set point angle, differences in cortical cell layer patterning, stem cell niche structure, and radial cell division. Using an introgression line population between these two species, we identified numerous loci that regulate these distinct aspects of development. Specifically we comprehensively identified loci that regulate (1) root length by distinct mechanisms including regulation of cell production within the meristem and the balance between cell division and expansion, (2) the gravity set point angle, and (3) radial cell division or expansion either in specific cell types or generally across multiple cell types. Our findings provide a novel perspective on the regulation of root growth and development between species. These loci have exciting implications with respect to regulation of drought resistance or salinity tolerance and regulation of root development in a family that has undergone domestication.