向光素调节植物向光性及其与光敏色素/隐花色素的相互关系

Specificity and Crosstalk of Phototropin with Cryptochrome and Phytochrome in Regulating Hypocotyl Phototropism

蓝光受体向光素(PHOT1/PHOT2)调节蓝光诱导的植物运动反应,包括植物向光性、叶绿体运动、气孔运动和叶片伸展等。其中,向光素介导的植物向光性能够促使植物弯向光源,确保其以最佳取向捕获光源,优化光合作用。光敏色素和隐花色素作为光受体也参与植物的向光性调节。该文综述了向光素介导的拟南芥(Arabidopsis thaliana)下胚轴向光弯曲信号转导及其与光敏色素、隐花色素协同作用的分子机制,以期为改造植物光捕获能力及提高光利用效率提供理论基础。

Blue light （BL） is a key factor controlling plant growth and morphogenesis. BL receptors phototropinl （PHOT1） and phototropin2 （PHOT2） mediate BL-induced plant movements such as phototropism, chloroplast relocation and stomatal opening responses. Phototropism allows plants to bend toward light by perceiving the direction, wavelength and intensity of incident light so that they can obtain optimum light. Phytochrome and cryptochrome are also involved in asymmetric regulation of hypocotyl growth, causing plant phototropic growth. In this review, we discuss the signaling for phototropins and focus on the crosstalk with phytochrome and cryptochrome signaling in regulating phototropism. Fun- damental progress in understanding the role of phototropins and phytochrome or cryptochrome in phototropism will con- tinue to provide a rational basis for biotechnological improvements in developing light-trapping plants with improved light-use efficiency.