Buer Charles S, Djordjevic Michael A
Australian Research Council Centre of Excellence for Integrative Legume Research, School of Science, College of Medicine, Biology, and Environment, The Australian National University, Canberra ACT 2601, Australia.
J Exp Bot. 2009;60(3):751-63. doi: 10.1093/jxb/ern323. Epub 2009 Jan 6.
Flavonoids are low molecular weight secondary plant metabolites with a myriad of functions. As flavonoids affect auxin transport (an important growth-controlling hormone) and are biologically active in eukaryotes, flavonoid mutants were expected to have undescribed architectural phenotypes. The Arabidopsis thaliana transparent testa (tt) mutants are compromised in the enzymatic steps or transcriptional regulators affecting flavonoid synthesis. tt mutant seedlings were grown on hard-slanted agar (a stress condition), under varying light conditions, and in soil to examine the resulting growth patterns. These tt mutants revealed a wide variety of architectural phenotypes in root and aerial tissues. Mutants with increased inflorescences, siliques, and lateral root density or reduced stature are traits that could affect plant yield or performance under certain environmental conditions. The regulatory genes affected in architectural traits may provide useful molecular targets for examination in other plants.
类黄酮是具有多种功能的低分子量次生植物代谢产物。由于类黄酮会影响生长素运输（一种重要的生长控制激素）且在真核生物中具有生物活性，因此预计类黄酮突变体具有未被描述的结构表型。拟南芥透明种皮（tt）突变体在影响类黄酮合成的酶促步骤或转录调节因子方面存在缺陷。将tt突变体幼苗种植在硬倾斜琼脂（一种胁迫条件）上、不同光照条件下以及土壤中，以检查由此产生的生长模式。这些tt突变体在根和地上组织中表现出各种各样的结构表型。具有增加的花序、角果和侧根密度或降低株高的突变体是可能在某些环境条件下影响植物产量或性能的性状。在结构性状中受到影响的调控基因可能为在其他植物中进行研究提供有用的分子靶点。
