【摘要】 对四倍体刺槐种子进行观测和解剖,结果证明:四倍体刺槐种子单粒重、有胚率和萌发率分别是二倍体刺槐的26.3%、30.1%和6.3%;单粒重10mg以上的种子(比例4.41%)萌发率达62.28%,小于7mg(比例84.97%)的种子就完全失去了萌发力。四倍体刺槐种胚重量、胚乳重量、种皮重量及三者的构成比例均明显不同于二倍体刺槐:四倍体刺槐的种子最大单胚重量、种皮重量明显小于二倍体刺槐,当单粒重小于8mg时,种子胚乳重量也显著低于二倍体刺槐;二倍体刺槐种胚、胚乳及种皮重量接近等比(分别为34.60%、33.22%和32.18%),但四倍体刺槐的种胚及胚乳所占比例随单粒重降低显著降低、种皮所占比例随单粒重的降低显著增高,且种皮所占比例明显大于二倍体刺槐种子。更多还原

【Abstract】 The seeds from the tetraploid Robinia pseudoacacia(TRP) were observed and dissected within successive 3 years.The individual seed weight,embryo rate and germination rate of TRP were 26.3%,30.1% and 6.3% of the diploid Robinia pseudoacacia(DRP),respectively.The germination rate of seeds varied with the weight of individual seed;the seed weight more than 10mg(account for 4.41%) had the germination rate of 62.28%,whereas the weight less than 7mg lost their germination ability.The embryo,seed coat and endosperm weight of seed from TRP were all significantly different from DRP.The maximum seed endosperm weight and seed coat weight of TRP were significantly lower than that of DRP,and the TRP endosperm weight was also remarkably lower than that of DRP when the individual seed weight was less than 8mg.The weight of embryo,?seed coat and endosperm of seed from the DRP were almost equal,accounting for 34.60%,33.22%,32.18% of the total weight,respectively.However,for the TRP seed,the weight percentages of both embryo and endosperm reduced and the weight percentages of seed coat rose with the declining of the weight of individual seed,and the percentage of seed coat from TRP were much larger than that from DPR更多还原