SubclassⅢsucrose nonfermenting1-related protein kinase 2s(SnRK2s)function in ABA and abiotic stress responses by unknown mechanisms.We found that osmotic stress/ABA-activated protein kinase 10(SAPK10),a member of ric...SubclassⅢsucrose nonfermenting1-related protein kinase 2s(SnRK2s)function in ABA and abiotic stress responses by unknown mechanisms.We found that osmotic stress/ABA-activated protein kinase 10(SAPK10),a member of rice SnRK2s,physically interacted with CBL-interacting protein kinase 1(OsCIPK1).OsCIPK1 expression was up-regulated by ABA and PEG treatment,and overexpression increased the ABA sensitivity of seed germination and root growth and plant osmotic stress tolerance.Osmotic stress or ABA-induced activation of OsCIPK1 is dependent on SAPK10.SAPK10 phosphorylates Thr-24 of OsCIPK1 in vitro,and this phosphorylation increases the activity of OsCIPK1 and positively regulates the function of OsCIPK1 in ABA responses and plant osmotic stress tolerance.This study suggests that OsCIPK1 is a direct phosphorylated substrate of SAPK10,and SAPK10-mediated phosphorylation of OsCIPK1 functions in ABA signaling and increases rice osmotic stress tolerance.展开更多
目的观察高渗透压对兔髓核细胞活性的影响及JNK/SAPK(c-Jun N-terminal kinases/stress-activated protein kinases)和p38信号转导通路在此过程中的作用。方法根据不同渗透压及时间段处理髓核细胞将实验分为对照组、刺激组和阻断组后采...目的观察高渗透压对兔髓核细胞活性的影响及JNK/SAPK(c-Jun N-terminal kinases/stress-activated protein kinases)和p38信号转导通路在此过程中的作用。方法根据不同渗透压及时间段处理髓核细胞将实验分为对照组、刺激组和阻断组后采用流式细胞仪检测各组髓核细胞凋亡情况,同时利用免疫荧光和Western blot技术检测磷酸化p38丝裂原活化蛋白激酶(phospho-p38mitogen-activated protein kinases,P-p38MAPK)、磷酸化JNK/SAPK激酶(phospho-JNK/SAPK,P-JNK/SAPK)的亚细胞定位及表达水平,观察其对髓核细胞凋亡的影响。结果高渗透压[600mOsm/kg H2O(mOsm)]可导致髓核细胞显著凋亡及P-p38 MAPK和P-JNK/SAPK蛋白表达水平改变。600mOsm时各刺激组凋亡细胞与对照组相比,差异均有显著统计学意义(P<0.01),而阻断组凋亡细胞明显减少;而400mOsm时各刺激组和阻断组凋亡细胞与对照组相比差异均无统计学意义;免疫荧光结果显示P-p38 MAPK和P-JNK/SAPK在髓核细胞质和细胞核中均有表达;经高渗透压(600mOsm)刺激后P-p38MAPK和P-JNK/SAPK表达均显著高于对照组(P<0.01),而相应阻断组P-p38MAPK和P-JNK/SAPK表达均显著降低。结论高渗透压通过激活JNK/SAPK和p38信号转导通路导致体外培养的兔髓核细胞凋亡,同时髓核细胞对轻度的渗透压升高具有一定的适应性。展开更多
基金supported by grants from the National Natural Science Foundation of China(31971824,32170316)。
文摘SubclassⅢsucrose nonfermenting1-related protein kinase 2s(SnRK2s)function in ABA and abiotic stress responses by unknown mechanisms.We found that osmotic stress/ABA-activated protein kinase 10(SAPK10),a member of rice SnRK2s,physically interacted with CBL-interacting protein kinase 1(OsCIPK1).OsCIPK1 expression was up-regulated by ABA and PEG treatment,and overexpression increased the ABA sensitivity of seed germination and root growth and plant osmotic stress tolerance.Osmotic stress or ABA-induced activation of OsCIPK1 is dependent on SAPK10.SAPK10 phosphorylates Thr-24 of OsCIPK1 in vitro,and this phosphorylation increases the activity of OsCIPK1 and positively regulates the function of OsCIPK1 in ABA responses and plant osmotic stress tolerance.This study suggests that OsCIPK1 is a direct phosphorylated substrate of SAPK10,and SAPK10-mediated phosphorylation of OsCIPK1 functions in ABA signaling and increases rice osmotic stress tolerance.
