Seed Dormancy and Storage Behavior of Magnolia sargentiana Endemic to China
It has been found that the natural regeneration of Magnolia sargentiana,an ornamental endemic to China,is highly poor,which is worth investigating cause.Embryos in mature M sargentiana seeds are extremely small.The embryos markedly grew in the process of both cold (4 ℃) and warm stratification (15 ℃) regardless of plant growth regulator pretreatment of GA3 and 6-BA solutions,and germinated at a range of temperatures,30 ℃/20 ℃ of which was optimal.These data illustrated that morphological dormancy is caused by an underdeveloped embryo that must mature prior to germination.In addition,M.sargentiana seeds could tolerate desiccation to a limited extent.The seed survival rates were 78.3％ and 40％ at 7.l％ and 5.3％ of water contents,respectively.When the seeds with 9.4％ or 7.1％ of water content were conserved at-20 ℃ for 6 months,they completely lost viability.However,if the same seeds were hermetically stored at 0 ℃ and 4 ℃ for 6 months,their viability was almost unchanged.These results fully confirm that M.sargentiana seeds are intermediate.
NETL
NSTL
万方数据
维普
