摘要
Under aseptic conditions, hypocotyls of mulberry were averagely cut into 3 segments which were then cultured on MS solid medium supplemented with 3.0 mg5L -1 6-BA, 0.3 mg5L -1 IAA, 1.0 mg5L -1 AgNO3 to select the best region of hypocotyls for getting the more caesptose shoots. In this study, the tip part of hypocotyls(near the germ) developed quickly and induced adventitious buds easily. The caesptose shoots were dipped into 1,1.5, 2.5 g5L -1 colchicines solution for 2 or 3 days, or dropped with 1.5, 2, 2.5 g5L -1 colchicines solution 2 times a day for 5 days, and then transferred to fresh medium. Both the dipped-and dropped-treatments induced variant shoots. Examination of the chromosomes of the shoot tip cells of the regenerated plantlets revealed that they were either tetraploids or chineras. The rate of tetraploids produced from the dipped-and dropped-treatments was 14% and 20% respectively with the chromosomes number of 56(2n=4x=56) as compared to the diploid(2n=2x=28).
Under aseptic conditions, hypocotyls of mulberry were averagely cut into 3 segments which were then cultured on MS solid medium supplemented with 3.0 mg·L^-1 6-BA, 0.3 mg·L^-1 IAA, 1.0 mg·L^- 1 AgNO3 to select the best region of hypocotyls for getting the more caesptose shoots. In this study, the tip part of hypocotyls(near the germ) developed quickly and induced adventitious buds easily. The caesptose shoots were dipped into 1,1.5, 2.5 g·L^-1 colchicines solution for 2 or 3 days, or dropped with 1.5, 2, 2.5 g·L^-1 colchicines solution 2 times a day for 5 days, and then transferred to fresh medium. Both the dipped- and dropped-treatments induced variant shoots. Examination of the chromosomes of the shoot tip cells of the regenerated plantlets revealed that they were either tetraploids or chineras. The rate of tetraploids produced from the dipped- and dropped- treatments was 14 % and 20 % respectively with the chromosomes number of 56(2 n = 4 x = 56) as compared to the diploid(2 n = 2x = 28) .
出处
《林业科学》
EI
CAS
CSCD
北大核心
2008年第6期164-167,共4页
Scientia Silvae Sinicae
基金
国家林业科技支撑计划(2006BAD03A16)
财政部“长江流域低山丘陵综合治理专项”(2004-04)
重庆市“十一五”重点科技攻关项目“果叶兼用人工多倍体新桑品种选育”(2006AB1002)
关键词
桑树
下胚轴
组织培养
秋水仙碱
多倍体植株
mulberry(Morus)
hypocotyls
tissue culture
colchicines
polyploidy