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姚家琳, 蔡得田. 水稻HDAR细胞胚胎学研究─—不定胚的发生和发育[J]. 植物科学学报, 1997, 15(1): 5-9.
引用本文: 姚家琳, 蔡得田. 水稻HDAR细胞胚胎学研究─—不定胚的发生和发育[J]. 植物科学学报, 1997, 15(1): 5-9.
Yao Jialing, Cai Detian. EMBRYOLOGICAL STUDIES ON RICE HDAR ──ORIGIN AND DEVELOPMENT OF ADVENTITIOUS EMBRYO[J]. Plant Science Journal, 1997, 15(1): 5-9.
Citation: Yao Jialing, Cai Detian. EMBRYOLOGICAL STUDIES ON RICE HDAR ──ORIGIN AND DEVELOPMENT OF ADVENTITIOUS EMBRYO[J]. Plant Science Journal, 1997, 15(1): 5-9.

水稻HDAR细胞胚胎学研究─—不定胚的发生和发育

EMBRYOLOGICAL STUDIES ON RICE HDAR ──ORIGIN AND DEVELOPMENT OF ADVENTITIOUS EMBRYO

  • 摘要: 对水稻HDAR胚胎发育过程的进一步研究表明,水稻HDAR中有2.72%(17/434)的不定胚发生和发育。其不定胚起源于胚珠内的珠心细胞。不定胚起始细胞启动分裂时,胚囊发育至2核或4核时期,8核胚囊时期,胚珠内已形成多细胞不定胚结构。随后不定胚细胞不断分裂并逐渐挤进胚囊。开花传粉后,不定胚利用胚乳提供的营养可以继续发育和分化。不定胚可以和合子胚一起发育,有时合子胚败育,不定胚继续发育并分化。讨论了水稻HDAR中不定胚的发生,及其发生远早于合子胚的意义。

     

    Abstract: Adventitious embryos were observed in certain frequency (2.72 per cent) inHigh-frequency Diploid Apomictic Rice (HDAR).Their origins were assured to be from nucellar cells in ovule.Early when tile embryo sac was in 2-nucleate or 4-nucleate stage,initial cells of the adventitious embryos started division,and then developed into embryonic structures of multiple cells while the embryo sac was in8-nucleate stage.Afterwards they went on dividing and squeezing into embryo sac.The adventitious embryocontinued developing with the nutrient offered by endosperm after pollination.Either didthe zygotic embryo continue developing along with the adventitious or degenerated, theadventitious embryos would go on differentiating and eventually develope into matureseed.The possible applications of adventitious embryos developed earlier than zygoticembryo did in rice were also discussed in this paper as well.

     

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