摘要
选连续三年发生空苞率达90%的树为材科,对其胚眙发育进程进行了观察,并与连续三年不发生空苞树作比较。结果表明:板栗空苞发生的原因在胚胎学上有如下几方面,大孢子母细胞发育停止,减数分裂不能正常进行;成熟胚囊结构异常,卵细胞、助细胞解体;传粉受精不良导致受精作用异常;原胚早期敗育、胚乳败育、胚发育中止及部分空苞中种子的子叶不发育等?鄄熘谢狗⑾?总苞及子房外形的大小与胚珠发育进程之间有密切关系;另在珠形胚时期,一个子房内发育胚珠与退化胚珠在外形大小上也有明显差別。
Compared with normal development, a embryological study has been systematically made on empty-bur of Chinese chestnut. The study reveals that the empty-bur may result from different causes as follows. Stagnancy of macrosporocyte, abnormal meiosis, unusual structure of embryo sac, disintegration of egg and synergid, unsuccessful pollination and fertilization, proembryo decaying at its early stage, degenerated endosperm and not-well-developed cotyledon.There is a certain relationship beetween the size of general-involucre and ovary and the stage of ovule developing. At spherical prombryo stage normal development ovule showing much difference from degnerated one, therefore whether normal ovule is growing in ovary can be distinguished
出处
《华中农业大学学报》
CAS
CSCD
北大核心
1989年第3期248-253,共6页
Journal of Huazhong Agricultural University
关键词
板栗
胚胎学
空苞
胚囊
胚
败育
Castanea mollissima
empty-bur
embryology
