Chinese Journal OF Rice Science >
Analyses on Agronomic Traits and Genetic Characteristics of Two New Plant-architecture Lines in Rice
Received date: 2021-02-06
Revised date: 2021-06-03
Online published: 2022-03-11
【Objective】 Ideal plant-architecture (IPA) can increase photosynthetic efficiency, economic yield and resistance to disease of rice. The objective is to develop excellent germplasms with IPA for high-yield and resistance breeding by exploring variation in traits and genetic characteristics of two rice germplasm with new plant-architectures. 【Method】 The two germplasms ‘08yi’ and ‘RIL60’ with new plant-architecture from two recombinant inbred lines (RIL) by natural recombination, and their corresponding conventional germplasm ‘08yc’ and ‘RILc’ from the same RIL were used as materials. The constitute factors of plant architecture, yield traits in different developmental periods, as well as sequencing of IPA1 gene and waxy identification in four germplasm were comparatively analyzed. 【Result】 The functional leaf traits, dry matter accumulation at different developmental stages as well as panicle and yield traits of the two new lines were significantly different from those of conventional germplasms. Compared to the corresponding conventional germplasm, ‘08yi’ and ‘RIL60’ were featured with favorable variations including reduced angles of functional leaf, proper leaf length, compact plant architecture, an increase of 1-2 panicle in the effective panicles per plant and increased seed setting rate by 7.37% and 5.09%, respectively. In addition, the chlorophyll contents of the new germplasm ‘08yi’ significantly increased, and the stem of ‘RIL60’ was thicker than that of ‘RILc’. The panicle traits of the two new germplasm under stress condition were better because they had smaller reduction of economic yield and stronger stress resistance compared to their corresponding conventional germplasm. However, their unfavorable variations include decreased panicle weight, shorter panicle length, decreased number of grains per panicle, seeds, branch length and branch number. The results of IPA1 gene sequencing showed that there were no mutations at 874 site of IPA1(C→A) in the two new germplasm compared with the Shaoniejing ipa1, and the variation of plant architecture was attributed to other factors. The result of waxy identification showed that ‘RIL60’ had waxy variation. 【Conclusion】 Thanks for preferred variation in agronomic traits, the two new lines can be used as excellent germplasms for IPA breeding and research. As a glutinous rice variety with IPA and economic yield equal to non-glutinous rice, RIL60 has enormous potential for extension.
LIANG Cheng, XIANG Xunchao, ZHANG Ouling, YOU Hui, XU Liang, CHEN Yongjun . Analyses on Agronomic Traits and Genetic Characteristics of Two New Plant-architecture Lines in Rice[J]. Chinese Journal OF Rice Science, 2022 , 36(2) : 171 -180 . DOI: 10.16819/j.1001-7216.2022.210208
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