Chinese Journal OF Rice Science >
Effects of Embryo Morphology and Endosperm Composition on Embryo-remaining Characteristics in Rice
Received date: 2022-08-25
Revised date: 2022-12-26
Online published: 2023-05-16
【Objective】The embryo of embryo-remaining rice has high nutritional value and ensures the taste of rice. However, related biological mechanisms, such as the relationship among embryo-remaining characteristics, embryo traits, and endosperm components remains unclear. Therefore, it is necessary to further study the difference of embryo-remaining rate among different types of rice varieties and its influencing factors.【Method】Therefore, typical embryo-retaining and non-embryo-remaining varieties were selected from soft japonica and common rice as experimental materials to investigate rice embryo-remaining characteristics. Here, the embryo development characteristics of the two types of varieties were observed by slicing; then, apparent amylose content (AAC) and abscission pectin contents were compared. Finally, the differences in embryo-remaining rate, embryo traits and endosperm composition were studied under external cytokinin (CTK) application.【Result】Compared with non-embryo-remaining varieties, embryo-remaining soft japonica varieties and common rice had larger inner and outer embryo width, faster embryo development, large embryo volume, better grain plumpness, wider and thicker grain shape and higher abscission pectin content. After the application of CTK, the development speed of the soft rice varieties was accelerated in the middle and late stages of development, while the embryo development of the common varieties slowed down. The AAC, pectin content, embryo weight percentage and embryo-remaining rate of the two types were increased.【Conclusion】In general, apart from embryo traits, endosperm composition mainly affected the embryo-remaining characteristics of soft rice varieties, whereas grain shape was an important factor influencing the embryo-remaining characteristics of common varieties. CTK regulates the embryo-remaining rate of different types of rice varieties by influencing different traits of rice seeds. These results will lay a new theoretical basis for the breeding and cultivation regulation of high embryo-remaining rice varieties.
MA Zhaohui, SHI Yihan, CHENG Haitao, SONG Wenwen, LU Lianji, LIU Renguang, LÜ Wenyan . Effects of Embryo Morphology and Endosperm Composition on Embryo-remaining Characteristics in Rice[J]. Chinese Journal OF Rice Science, 2023 , 37(3) : 265 -275 . DOI: 10.16819/j.1001-7216.2023.220809
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