J Integr Plant Biol. ›› 1996, Vol. 38 ›› Issue (12): -.

• Research Articles •    

Embryological Observation on the Apomictic Rice-ApⅢ (Shuang 13)

Mu Xi-jin, Shi Guang-chun, Zhu Zhi-qing, Cai Xue and Ni Pi-chong   

Abstract: Since 1988s, the phenomenon of multiple seedlings and multiple embryoes of apomictic rice, Ap Ⅲ (Shuang 13) has been interestingly concerned. Embryological investigation of Ap Ⅲ has been carried out with the whole dissection and conventional sectioning technique. The main conclusions are as follows: 1.8. 9 % of 5000 matured caryopsises, contained one embryo in a caryopsis, from which single seedling arose, while 8.9 % twin embryoes and 1.2 % triplet embryoes of which developed two seedlings and triple seedlings respectively; 2. In over 700 young caryopsises, 90.0%~95.0% contained only one embryo, 5.0%~7.0% twin embryoes, except a few of the ovules with absorptive embryo sac or embryo and endosperm. Triplet embryoes caryopsis could not be traced further due to their low frequency; 3. Authors' materials showed that all the single, twin and triplet embryoes were situated at the micropylar end in one embryo sac of young ovule and no adventitious embryo was seen outside the embryo sac of ovules. From the aforementioned results, it can be infered that albeit single embryo is derived from the egg cell yet it could be possible twin or triplet embryocs may be developed from the egg cell and one or two of the synergids either or not through fertilization.

Key words: Rice, Polyembryony, Synergid embryo

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