Roles of Key Genes and Relevant Plant Hormones in the Early and Late Stages of Plant Embryogenesis

doi:10.13560/j.cnki.biotech.bull.1985.2017-0502

Abstract

Abstract: Both LEAFY COTYLEDON 1-LIKE and LEAFY COTYLEDON1 are AHAP3 subunit of the LEAFY COTYLEDON1 type，but LEAFY COTYLEDON 1-LIKE is capable of converting the cells of vegetable stage into the cells of embryo periods in the early stages of somatic embryogenesis，differing from the LEAFY COTYLEDON1 that plays an important role in the early stages of embryonic development. LEAFY COTYLEDON2，which has the same specific B3 domain as the LEAFY COTYLEDON gene，can participate in creating the environment of embryogenesis in somatic tissue by IPA-YUC auxin synthesis pathway. Besides，LEAFY COTYLEDON2 promotes the occurrence and development of embryos by regulating the ratio of ABA/GA. The expression of WUSCHE and SHOOTMERISTEMLESS is independent but coordinated to maintain the function of shoot apical meristem（SAM）. The KNOX pathway that is independent from the WUSCHE expression but interacts with plant hormone can maintain the environment of high-concentration CK and low-concentration GA for embryonic SAM，which is beneficial to the pathway of WUSCHE -CLAVATA responding to CK and continuously produce stem cells. In summary，it is feasible to improve the understanding of the molecular regulation network of embryogenesis，and to lay the molecular basis for further studying embryogenesis.

Key words: LEAFY COTYLEDON-like gene, somatic embryos, WUSCHE, SAM, plant hormone

ZHAO Fang-dong, LI Lin-kun, HE Xu-sheng, ZENG Hui-ming. Roles of Key Genes and Relevant Plant Hormones in the Early and Late Stages of Plant Embryogenesis[J]. Biotechnology Bulletin, 2017, 33(12): 30-36.

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