The relationship among growing process,drops and endogenous hormones contents on Ginkgo biloba seeds were studied. The results showed that the growing curve of seed is S shape. The period of seed expanding late from t...The relationship among growing process,drops and endogenous hormones contents on Ginkgo biloba seeds were studied. The results showed that the growing curve of seed is S shape. The period of seed expanding late from the beginning of May to the middle of July. There is a remarkable relation between seed growth and content of endogenous hormones in seeds. The contents of IAA,ZR and ABA are higher whereas GA 3 is lower in the period of flourishing florescence, then the content of IAA,ZR and ABA significantly decreased but GA 3 increases after pollination. In the period of seed expanding, the content of IAA and ZT gradually increases again, and reaches another peak at the beginning of July, then both of them steady decrease, but at the same time the content of ABA gradually increases until the seed ripe. In a word, the function of GA 3,IAA,ZR and ZT seem to prompt the seed growth, whereas ABA concerns with seed mature and drops. There are two times drops of Ginkgo biloba seeds. The drops are related to hormones.展开更多
Seed vigor is a key factor affecti ng seed quality.The mechanical drying process exerts a sign ificant in fluence on rice seed vigor.The initial moisture con tent(IMC)and drying temperature are considered the main fac...Seed vigor is a key factor affecti ng seed quality.The mechanical drying process exerts a sign ificant in fluence on rice seed vigor.The initial moisture con tent(IMC)and drying temperature are considered the main factors affecting rice seed vigor through mechanical drying.This study aimed to determine the optimum drying temperature for rice seeds according to the IMC,and elucidate the mechanisms mediating the effects of drying temperature and IMC on seed vigor.Rice seeds with three different IMCs(20%,25%,and 30%)were dried to the target moisture content(14%)at four different drying temperatures.The results showed that the drying temperature and IMC had significant effects on the drying performance and vigor of the rice seeds.The upper limits of drying temperature for rice seeds with 20%,25%,and 30%IMCs were 45,42,and 38°C,respectively.The drying rate and seed temperature increased sign ificantly with in creasing drying temperature.The drying temperature,drying rate,and seed temperature showed extremely significant negative correlations with germination energy(GE),germination rate,germination index(Gl),and vigor index(VI).A high IMC and drying temperature probably induced a massive accumulation of hydrogen peroxide(H2O2)and superoxide anions in the seeds,enhanced superoxide dismutase(SOD)and catalase(CAT)activity,and increased the abscisic acid(ABA)content.In the early stage of seed germination,the IMC and drying temperature regulated seed germination through the metabolism of H2O2,gibberellin acid(GA),ABA,and a-amylase.These results indicate that the metabolism of reactive oxygen species(ROS),antioxidant enzymes,GA,ABA,and a-amylase might be involved in the mediation of the effects of drying temperature on seed vigor.The results of this study provide a theoretical basis and technical guidance for the mechanical drying of rice seeds.展开更多
文摘The relationship among growing process,drops and endogenous hormones contents on Ginkgo biloba seeds were studied. The results showed that the growing curve of seed is S shape. The period of seed expanding late from the beginning of May to the middle of July. There is a remarkable relation between seed growth and content of endogenous hormones in seeds. The contents of IAA,ZR and ABA are higher whereas GA 3 is lower in the period of flourishing florescence, then the content of IAA,ZR and ABA significantly decreased but GA 3 increases after pollination. In the period of seed expanding, the content of IAA and ZT gradually increases again, and reaches another peak at the beginning of July, then both of them steady decrease, but at the same time the content of ABA gradually increases until the seed ripe. In a word, the function of GA 3,IAA,ZR and ZT seem to prompt the seed growth, whereas ABA concerns with seed mature and drops. There are two times drops of Ginkgo biloba seeds. The drops are related to hormones.
基金Key Research and Development Program of Zhejiang Province(No.2019C02011)the“San Nong Liu Fang”Science and Technology Cooperation Project of Zhejiang Province(No.2018SNLF004),China。
文摘Seed vigor is a key factor affecti ng seed quality.The mechanical drying process exerts a sign ificant in fluence on rice seed vigor.The initial moisture con tent(IMC)and drying temperature are considered the main factors affecting rice seed vigor through mechanical drying.This study aimed to determine the optimum drying temperature for rice seeds according to the IMC,and elucidate the mechanisms mediating the effects of drying temperature and IMC on seed vigor.Rice seeds with three different IMCs(20%,25%,and 30%)were dried to the target moisture content(14%)at four different drying temperatures.The results showed that the drying temperature and IMC had significant effects on the drying performance and vigor of the rice seeds.The upper limits of drying temperature for rice seeds with 20%,25%,and 30%IMCs were 45,42,and 38°C,respectively.The drying rate and seed temperature increased sign ificantly with in creasing drying temperature.The drying temperature,drying rate,and seed temperature showed extremely significant negative correlations with germination energy(GE),germination rate,germination index(Gl),and vigor index(VI).A high IMC and drying temperature probably induced a massive accumulation of hydrogen peroxide(H2O2)and superoxide anions in the seeds,enhanced superoxide dismutase(SOD)and catalase(CAT)activity,and increased the abscisic acid(ABA)content.In the early stage of seed germination,the IMC and drying temperature regulated seed germination through the metabolism of H2O2,gibberellin acid(GA),ABA,and a-amylase.These results indicate that the metabolism of reactive oxygen species(ROS),antioxidant enzymes,GA,ABA,and a-amylase might be involved in the mediation of the effects of drying temperature on seed vigor.The results of this study provide a theoretical basis and technical guidance for the mechanical drying of rice seeds.
