DOG1(Delay of germination 1)蛋白是种子休眠的一种主要调控因子,可与ABA协同作用来延迟种子萌发。核心脱落酸(ABA)信号转导途径和DOG1途径在蛋白磷酸酶2C(PP2C)中汇聚。DOG1调控种子休眠需要PP2C,并通过与ABA过敏感萌发(AHG1/AHG3)结...DOG1(Delay of germination 1)蛋白是种子休眠的一种主要调控因子,可与ABA协同作用来延迟种子萌发。核心脱落酸(ABA)信号转导途径和DOG1途径在蛋白磷酸酶2C(PP2C)中汇聚。DOG1调控种子休眠需要PP2C,并通过与ABA过敏感萌发(AHG1/AHG3)结合来增强ABA的信号转导。DOG1抑制AHG1的作用来增加ABA的敏感性和诱导种子休眠。近年来,DOG1对种子休眠与萌发的调控研究取得了显著进展。本文对该领域的研究成果进行了综述,主要包括:DOG1对种子成熟、休眠与萌发的作用,DOG1表达的转录调控机制以及DOG1对种子休眠与萌发的调控及作用机制,最后提出了在本领域需要进一步研究的科学问题。展开更多
Influencing factors to seed dormancy and germination characteristics of Sorbus pohuashanensis were studied. These factors included the morphological development of embryos,the mechanical obstruction of the seed coat,t...Influencing factors to seed dormancy and germination characteristics of Sorbus pohuashanensis were studied. These factors included the morphological development of embryos,the mechanical obstruction of the seed coat,the water and air permeability of seed coat,and the biologic inhibition of extracts from different parts of seed. The results showed that when the seeds of Sorbus pohuashanensis became mature,the morphological development of the embryos was complete. The influencing effect of the mechanical obstruction,the water and permeability of seed coat for seed germination was little; there were inhibited substances to the seed of cabbage germination in seed coat and embryo,the germination depressor could be fat soluble substances. This indicated that the dormant degree was different for the different embryo parts. Cotyledon and hypocotyl was in low degree dormancy,whereas radicle and epicotyl was in high degree dormancy. To some extent,the germination rate of in vitro cultured embryos was increased with detruncating cotyledon and radicle treament. A 1∶3 mixture of seeds and sharp sand at low temperature in favor of removing dormancy. Treated by 200 mg·L -1 6-BA for 24 h,then remained in low temperature (0～5 ℃),seeds could germinated well (the germination rate could reached 31.56% in 3 month treatment). ABA completely inhibited the germination of seed,warm-cold varied temperature treatment did not promote the removing of dormancy of seed.展开更多
文摘DOG1(Delay of germination 1)蛋白是种子休眠的一种主要调控因子,可与ABA协同作用来延迟种子萌发。核心脱落酸(ABA)信号转导途径和DOG1途径在蛋白磷酸酶2C(PP2C)中汇聚。DOG1调控种子休眠需要PP2C,并通过与ABA过敏感萌发(AHG1/AHG3)结合来增强ABA的信号转导。DOG1抑制AHG1的作用来增加ABA的敏感性和诱导种子休眠。近年来,DOG1对种子休眠与萌发的调控研究取得了显著进展。本文对该领域的研究成果进行了综述,主要包括:DOG1对种子成熟、休眠与萌发的作用,DOG1表达的转录调控机制以及DOG1对种子休眠与萌发的调控及作用机制,最后提出了在本领域需要进一步研究的科学问题。
文摘Influencing factors to seed dormancy and germination characteristics of Sorbus pohuashanensis were studied. These factors included the morphological development of embryos,the mechanical obstruction of the seed coat,the water and air permeability of seed coat,and the biologic inhibition of extracts from different parts of seed. The results showed that when the seeds of Sorbus pohuashanensis became mature,the morphological development of the embryos was complete. The influencing effect of the mechanical obstruction,the water and permeability of seed coat for seed germination was little; there were inhibited substances to the seed of cabbage germination in seed coat and embryo,the germination depressor could be fat soluble substances. This indicated that the dormant degree was different for the different embryo parts. Cotyledon and hypocotyl was in low degree dormancy,whereas radicle and epicotyl was in high degree dormancy. To some extent,the germination rate of in vitro cultured embryos was increased with detruncating cotyledon and radicle treament. A 1∶3 mixture of seeds and sharp sand at low temperature in favor of removing dormancy. Treated by 200 mg·L -1 6-BA for 24 h,then remained in low temperature (0～5 ℃),seeds could germinated well (the germination rate could reached 31.56% in 3 month treatment). ABA completely inhibited the germination of seed,warm-cold varied temperature treatment did not promote the removing of dormancy of seed.
