Seedling growth and physiological characteristics of peanut after cold stress on seeds
Clarifing growth and physiological characteristics of peanut seedling germinated from seeds under low temperature was expected to provide reference for peanut production in regions susceptible to low temperature during harvest.Peanut variety Qinghua 7 was used.Seeds at 100％maturity without low temperature stress were used as control,seeds at 90％maturity with 2℃ and -1℃ low temperature stress were set as T1 and T2,respective-ly,seeds at 100％maturity with 2℃ and -1℃ low temperature stress were set as T3 and T4,respectively.The maxi-mum photochemical efficiency(Fv/Fm),dry matter accumulation and endogenous hormone content of peanut seed-lings that germinated from different treated seeds were studied.Results showed that compared with control,seed-lings Fv/Fm was inhibited when germinated from low temperature treatments.And the lower the seed maturity,the more obvious the effect of low temperature stress.At 10-18 d after emergence,the aboveground dry matter weight of seedlings under T1 and T2 was significantly lower than control,while the underground dry matter weight of seed-lings in each low temperature treatment had no significant difference with control,but was significantly higher at 22-26 d after emergence.The hormone contents of GA3,ZR,IAA and ABA in each treatment showed the same trend with seedling growth,but the contents in each sampling period showed obvious differences under different stress temperature and maturity.At 10 d after emergence,the(IAA+GA3+ZR)/ABA ratios of T1-T4 were 12.82％,25.64％,25.64％and 38.46％lower than control respectively,but when 26 d after emergence,(IAA+GA3+ZR)/ABA ratios were 47.62％,42.11％,60％and 46.34％higher than control respectively.Temperature had extremely signifi-cant effects on GA3,ZR,ABA and(IAA+GA3+ZR)/ABA ratio,and had significant effects on Fv/Fm values.Maturity had extremely significant effects on GA3 and ZR.The(IAA+GA3+ZR)/ABA ratio was positively correlated with dry matter accumulation and was negatively correlated with root/shoot ratio and Fv/Fm.It is suggested that peanut is harvested after full maturity in areas with high incidence of cold damage to avoid seed quality degradation and seed-ling growth limitation caused by low temperature stress.
peanutlow temperature stressseed maturitydry matter qualityFv/Fmendogenous hormone
万方数据
维普
