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Regulation of monocot and dicot plant development with constitutively active alleles of phytochrome B

机译：用Phytochrome B组成型活性等位基因调控单子叶和植物植物发育

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The constitutively active missense allele of Arabidopsis phytochrome B, AtPHYBY276H or AtYHB, encodes a polypeptide that adopts a light-insensitive, physiologically active conformation capable of sustaining photomorphogenesis in darkness. Here, we show that the orthologous OsYHB allele of rice phytochrome B (OsPHYBY283H ) also encodes a dominant "constitutively active" photoreceptor through comparative phenotypic analyses of AtYHB and OsYHB transgenic lines of four eudicot species, Arabidopsis thaliana, Nicotiana tabacum (tobacco), Nicotiana sylvestris and Solanum lycopersicum cv. MicroTom (tomato), and of two monocot species, Oryza sativa ssp. japonica and Brachypodium distachyon. Reciprocal transformation experiments show that the gain-of-function constitutive photomorphogenic (cop) phenotypes by YHB expression are stronger in host plants within the same class than across classes. Our studies also reveal additional YHB-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 YHB allele and species/cultivar transformed. Flowering and tillering of OsYHB- and OsPHYB-expressing lines of rice Nipponbare and Kitaake cultivars were compared, also revealing differences in YHB/PHYB allele versus genotype interaction on the phenotypic behavior of the two rice cultivars. In view of recent evidence that the regulatory activity of AtYHB is not only light insensitive but also temperature insensitive, selective YHB expression is expected to yield improved agronomic performance of both dicot and monocot crop plant species not possible with wild-type PHYB alleles.? 2020 The Authors. Plant Direct published by American Society of Plant Biologists, Society for Experimental Biology and John Wiley & Sons Ltd.
机译：Arabidopsis植物植物植物B，Athyby276H或AtyHb的组成型活性的致命等位基因编码了一种具有能够在黑暗中维持光学发生的光不分敏感的生理学上活性构象的多肽。在这里，我们表明，水稻植物植物（QoSy283h）的正交OSYHB等位基因还通过四个edicot种类，拟南芥塔尼菊（烟草），尼古拉尼核桃，尼古拉省烟草（烟草Sylvestris和Solanum Lycopersicum cv。 Microtom（番茄），以及两种单码型物种，Oryza Sativa SSP。 japonica和broachymodium distachyon。互易转化实验表明，在同一级别的宿主植物中，YHB表达的功能性组成型光学发生（COP）表型比跨越类。我们的研究还揭示了成年植物中额外的YHB依赖性特征，包括极端的阴影耐受性，早期和晚期开花行为，延迟叶片衰老，减少分蘖，甚至viviparous种子萌发。然而，这些功能性表型的强度取决于YHB等位基因和物种/品种转化的特定组合。比较了欧育和凯西纳品种表达水稻和凯西粥品种的开花和分蘖，也揭示了YHB / PHYB等位基因与基因型相互作用对两种水稻品种的表型行为的差异。鉴于最近的证据表明AtyHB的调节活动不仅光不振，而且温度不敏感，有选择性YHB表达预期会产生改善的种子和单子叶植物植物物种的改善，并且在野生型PHYB等位基因中不可能。？ 2020作者。植物直接发表美国植物生物学家，实验生物学学会和约翰瓦里和儿子有限公司

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