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首页> 美国卫生研究院文献>Plant Direct >Regulation of monocot and dicot plant development with constitutively active alleles of phytochrome B
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Regulation of monocot and dicot plant development with constitutively active alleles of phytochrome B

机译：用植物色素B的组成性活性等位基因调节单子叶植物和双子叶植物的发育

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摘要

The constitutively active missense allele of Arabidopsis phytochrome B, or , encodes a polypeptide that adopts a light‐insensitive, physiologically active conformation capable of sustaining photomorphogenesis in darkness. Here, we show that the orthologous allele of rice phytochrome B ( ) also encodes a dominant “constitutively active” photoreceptor through comparative phenotypic analyses of and transgenic lines of four eudicot species, , (tobacco) and cv. MicroTom (tomato), and of two monocot species, ssp. japonica and . Reciprocal transformation experiments show that the gain‐of‐function nstitutive hotomorphogenic ( ) phenotypes by expression are stronger in host plants within the same class than across classes. Our studies also reveal additional ‐dependent traits in adult plants, which include extreme shade tolerance, both early and late flowering behaviors, delayed leaf senescence, reduced tillering, and even viviparous seed germination. However, the strength of these gain‐of‐function phenotypes depends on the specific combination of allele and species/cultivar transformed. Flowering and tillering of ‐ and ‐expressing lines of rice Nipponbare and Kitaake cultivars were compared, also revealing differences in allele versus genotype interaction on the phenotypic behavior of the two rice cultivars. In view of recent evidence that the regulatory activity of YHB is not only light insensitive but also temperature insensitive, selective expression is expected to yield improved agronomic performance of both dicot and monocot crop plant species not possible with wild‐type alleles.
机译：拟南芥植物色素B的组成型活性错义等位基因编码的多肽具有对光不敏感的生理活性构象，能够在黑暗中维持光形态发生。在这里，我们通过对四种双子叶植物（烟草）和cv的表型和转基因品系进行比较表型分析，表明水稻植物色素B（）的直系同源等位基因也编码了一个显性的“组成型活性”感光体。 MicroTom（番茄），和两个单子叶植物物种，ssp。粳稻和。相互转化实验表明，在同一类内的寄主植物中，通过表达获得的功能性本位性热形态发生（）表型要强于跨类。我们的研究还揭示了成年植物的其他依赖性状，包括极强的耐荫性，早花期和晚花期行为，叶片衰老延迟，分till减少，甚至胎生种子发芽。但是，这些功能获得表型的强度取决于等位基因和转化的物种/品种的特定组合。比较了水稻Nipponbare和Kitaake品种的开花和分till，并揭示了等位基因与基因型相互作用对两个水稻品种表型行为的差异。鉴于最近的证据表明，YHB的调节活性不仅对光不敏感，而且对温度不敏感，因此，选择性表达有望使双子叶植物和单子叶植物品种的农艺性能得到改善，而野生型等位基因则不可能。

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