以源于二倍体梨品种Fertility(Pyrus communis L.)通过秋水仙碱离体诱变体细胞染色体加倍获得的不同同源多倍体无性系为试材,以离体叶片为外植体,观察研究了不同倍性无性系叶片的不定梢再生能力。结果表明,多倍体的不定梢再生率显著低...以源于二倍体梨品种Fertility(Pyrus communis L.)通过秋水仙碱离体诱变体细胞染色体加倍获得的不同同源多倍体无性系为试材,以离体叶片为外植体,观察研究了不同倍性无性系叶片的不定梢再生能力。结果表明,多倍体的不定梢再生率显著低于二倍体的再生率。不同多倍体无性系的不定梢再生能力也存在显著差异。三倍体无性系3x-3和四倍体无性系4x-4不能诱导产生不定梢。表明器官发生能力下降或植物细胞全能性的丧失与细胞染色体多倍体化有关。展开更多
Using in vitro leaves of Zizyphus jujuba ‘Kongfusucui’ plantlet as explants,effects of culture method,phytohormone proportion and culture time on induction rate of adventitious shoot from leaves and effects of sucro...Using in vitro leaves of Zizyphus jujuba ‘Kongfusucui’ plantlet as explants,effects of culture method,phytohormone proportion and culture time on induction rate of adventitious shoot from leaves and effects of sucrose concentrations in rooting media on rooting of adventitious shoot were studied.The results show that induction rate of adventitious shoot by two-step culture method(firstly cultured on medium Ⅰ for four weeks then cultured on medium Ⅱ for three weeks) is significantly higher than that by one-step culture method(cultured continuously on medium Ⅰ for seven weeks).Phytohormone proportion in medium Ⅰ has an obviously influence on induction rate of adventitious shoot,which gradually increases with increasing of TDZ concentration in medium Ⅰ.And adding 1.0 mg·L-1 TDZ in medium Ⅰ leads to induction rate with above 80%.With culture time prolonging(cultured for 1,2,3 or 4 weeks on medium Ⅰ,respectively),induction rate increases gradually.Sucrose concentration has a significant effect on rooting of adventitious shoot,sucrose with higher concentration(30 g·L-1) is beneficial to rooting.According to induction rate and growth status of adventitious shoot,it is determined that optimal culture method of adventitious shoot induction from Z.jujuba 'Kongfusucui' leaves is two-step culture method,that is,leaves firstly cultured on WPM medium containing 1.0 mg·L-1 TDZ and 0.5 mg·L-1 IAA for four weeks,and then cultured on WPM medium containing 0.5 mg·L-1 IAA and 1.0 mg·L-1 GA3 till adventitious shoot produced.展开更多
文摘以源于二倍体梨品种Fertility(Pyrus communis L.)通过秋水仙碱离体诱变体细胞染色体加倍获得的不同同源多倍体无性系为试材,以离体叶片为外植体,观察研究了不同倍性无性系叶片的不定梢再生能力。结果表明,多倍体的不定梢再生率显著低于二倍体的再生率。不同多倍体无性系的不定梢再生能力也存在显著差异。三倍体无性系3x-3和四倍体无性系4x-4不能诱导产生不定梢。表明器官发生能力下降或植物细胞全能性的丧失与细胞染色体多倍体化有关。
文摘Using in vitro leaves of Zizyphus jujuba ‘Kongfusucui’ plantlet as explants,effects of culture method,phytohormone proportion and culture time on induction rate of adventitious shoot from leaves and effects of sucrose concentrations in rooting media on rooting of adventitious shoot were studied.The results show that induction rate of adventitious shoot by two-step culture method(firstly cultured on medium Ⅰ for four weeks then cultured on medium Ⅱ for three weeks) is significantly higher than that by one-step culture method(cultured continuously on medium Ⅰ for seven weeks).Phytohormone proportion in medium Ⅰ has an obviously influence on induction rate of adventitious shoot,which gradually increases with increasing of TDZ concentration in medium Ⅰ.And adding 1.0 mg·L-1 TDZ in medium Ⅰ leads to induction rate with above 80%.With culture time prolonging(cultured for 1,2,3 or 4 weeks on medium Ⅰ,respectively),induction rate increases gradually.Sucrose concentration has a significant effect on rooting of adventitious shoot,sucrose with higher concentration(30 g·L-1) is beneficial to rooting.According to induction rate and growth status of adventitious shoot,it is determined that optimal culture method of adventitious shoot induction from Z.jujuba 'Kongfusucui' leaves is two-step culture method,that is,leaves firstly cultured on WPM medium containing 1.0 mg·L-1 TDZ and 0.5 mg·L-1 IAA for four weeks,and then cultured on WPM medium containing 0.5 mg·L-1 IAA and 1.0 mg·L-1 GA3 till adventitious shoot produced.