Emergent Protective Organogenesis in Date Palms: A Morpho-Devo-Dynamic Adaptive Strategy during Early Development
文献类型： 外文期刊
作者： Xiao, Ting Ting 1 ; Aragon Raygoza, Alejandro 2 ; Caballero Perez, Juan 2 ; Kirschner, Gwendolyn 1 ; Deng, Yanmi 1 ;
作者机构： 1.KAUST, BESE, Thuwal 239556900, Saudi Arabia
2.CINVESTAV, Lab Nacl Genom Biodiversidad LANGEBIO, Unidad Genom Avanzada, Mol & Dev Complex Grp, Guanajuato 36821, Mexico
3.Jiangsu Acad Agr Sci, Inst Leisure Agr, Prov Key Lab Hort Crop Genet Improvement, Nanjing 210014, Jiangsu, Peoples R China
4.Univ Nottingham, Sch Biosci, Hounsfield Facil, Nottingham LE12 3RD, England
5.KAUST, Phys Sci & Engn Div, COHMAS Lab, Thuwal 239556900, Saudi Arabia
期刊名称：PLANT CELL （ 影响因子：11.277； 五年影响因子：12.061 ）
ISSN： 1040-4651
年卷期： 2019 年 31 卷 8 期
页码：
收录情况： SCI
摘要： Desert plants have developed mechanisms for adapting to hostile desert conditions, yet these mechanisms remain poorly understood. Here, we describe two unique modes used by desert date palms (Phoenix dactylifera) to protect their meristematic tissues during early organogenesis. We used x-ray micro-computed tomography combined with high-resolution tissue imaging to reveal that, after germination, development of the embryo pauses while it remains inside a dividing and growing cotyledonary petiole. Transcriptomic and hormone analyses show that this developmental arrest is associated with the low expression of development-related genes and accumulation of hormones that promote dormancy and confer resistance to stress. Furthermore, organ-specific cell-type mapping demonstrates that organogenesis occurs inside the cotyledonary petiole, with identifiable root and shoot meristems and their respective stem cells. The plant body emerges from the surrounding tissues with developed leaves and a complex root system that maximizes efficient nutrient and water uptake. We further show that, similar to its role in Arabidopsis (Arabidopsis thaliana), the SHORT-ROOT homolog from date palms functions in maintaining stem cell activity and promoting formative divisions in the root ground tissue. Our findings provide insight into developmental programs that confer adaptive advantages in desert plants that thrive in hostile habitats.
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