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SUPPRESSOR OF RDO5 1, a Homolog of rice Seed dormancy 4, Interacts with bHLH57 and Controls ABA Biosynthesis and Seed Dormancy in Arabidopsis
The Plant Cell ( IF 11.6 ) Pub Date : 2020-03-25
Liu, F., Zhang, H., Ding, L., Soppe, W., Xiang, Y.

The regulation of seed dormancy by ABA has been extensively studied, but its underlying regulatory mechanism is not fully understood. Here we report the characterization of two ABA-related seed dormancy regulators, SUR1 (SUPPRESSOR OF RDO5 1, a homolog of Sdr4 in rice) and bHLH57 in Arabidopsis. SUR1, whose transcript levels are directly suppressed by ABI3, negatively regulates seed dormancy by affecting ABA biosynthesis and ABA signaling. In contrast, bHLH57 positively regulates seed dormancy through ABA biosynthesis by directly upregulating NCED6 and NCED9 expression. SUR1 interacts with bHLH57 and inhibits bHLH57-regulated NCED6 and NCED9 expression in the nucleus. Mutations in bhlh57 can partially decrease the enhanced NCED6 and NCED9 expression and rescue the hyper-dormancy phenotype of sur1-2. Thus, we identified a novel ABI3-SUR1-bHLH57-NCED6/9 network that provides insights into the regulation of seed dormancy by ABA biosynthesis and signaling.



中文翻译:

RDO5 1的抑制剂,水稻种子休眠4的同源物,与bHLH57相互作用并控制拟南芥中ABA的生物合成和种子休眠

ABA对种子休眠的调控已被广泛研究,但其潜在的调控机制尚不完全清楚。在这里,我们报告了两个与ABA相关的种子休眠调节因子,即SUR1(RDO5 1的抑制剂,水稻中Sdr4的同源物)和拟南芥中的bHLH57的表征。SUR1的转录水平受到ABI3的直接抑制,它通过影响ABA的生物合成和ABA信号传导而负调控种子休眠。相反,bHLH57通过直接上调NCED6和NCED9表达,通过ABA生物合成正调控种子休眠。SUR1与bHLH57相互作用并抑制bHLH57调节的核中NCED6和NCED9的表达。bhlh57中的突变可以部分降低增强的NCED6和NCED9表达,并拯救sur1-2的超休眠表型。从而,

更新日期:2020-03-26
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