EFFICIENT PLANT-REGENERATION FROM LONG-TERM CALLUS-CULTURES OF RICE BY SPERMIDINE

被引:7
作者
BAJAJ, S [1 ]
RAJAM, MV [1 ]
机构
[1] UNIV DELHI, DEPT GENET, NEW DELHI 110021, INDIA
关键词
MORPHOGENESIS; ORYZA SATIVA L; POLYAMINES; SPERMIDINE;
D O I
暂无
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
A significant reduction in regeneration potential with increasing age (up to 12 months) in rice (Oryza sativa L. cv.TH-1) embryogenic callus cultures was observed. Spermidine, while having an inhibitory effect on plant regeneration in fresh callus cultures, promoted morphogenesis in long-term callus cultures. A massive accumulation of polyamines, particularly putrescine (5-fold) was observed in 12 month old cultures resulting in a change of putrescine/spermidine ratio, which seems to be important for maintaining the morphogenetic response. Application of exogenous spermidine to 12 month old cultures showed increased levels of polyamines and restored the putrescine/spermidine ratio comparable to that found in freshly induced cultures, concomitantly, promoting the plant regeneration via somatic embryogenesis in long-term rice callus cultures.
引用
收藏
页码:717 / 720
页数:4
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