Work

Physiological characters of carbon, nitrogen, and hormones in ratooning rice cultivars with strong regeneration ability

Year: 2021

Type: article

Abstract: It is of great significance to clarify the physiological basis and hormone regulation characteristics of axillary bud germination for the selection of ratoon rice cultivars with strong ratooning ability and the regulation of cultivation techniques. In this study, the content of non-structural carbohydrate (NSC) and total nitrogen in different parts of 13 cultivars selected in 2019 were analyzed at the first harvest stage using the screening platform established in Chongyi County, Jiangxi Province. The biosynthesis and signal transduction genes of brassinolides and strigolactones, which promoted and inhibited axillary bud germination, were also studied. The results showed that there were significant differences in the regeneration rate of 13 cultivars, ranging from 1.26 to 2.38. The contents of soluble sugar, starch and non-structural carbohydrate in leaves, leaf sheaths, and stems were significantly different among different cultivars at different node positions (P-values were all less than 0.001). The total nitrogen content was also significant difference among them except for the upper and lower node stems. The correlation analysis showed that the contents of the soluble sugar, starch and NSC of the stem at the lower node had significant or extremely significant correlation with the regeneration rates (R2 = 0.4442*, 0.9000**, and 0.8303**, respectively), while there was no significant correlation in others. The relative expression levels of tillering promoting genes (CYP90A, CYP85A2, D2, BRI, BSK, and CYCD3) in BR synthesis and signal pathway were higher, while the inhibited tillering genes (CYP734A1, BZR, and BKI) were lower in Guyou 676 with higher regeneration rates. In conclusion, the starch content in the stem at the lower node could be used as the screening index of strong regeneration ability cultivar, and also the relative expression levels of BR pathway related genes could be used as supplementary indexes.

Source: ACTA AGRONOMICA SINICA

DOI: 10.3724/sp.j.1006.2021.02070

Authors: Su-Hua HUANG, Xi-Yue LIN, Zheng-Ping LEI, Zai-Song DING, Ming ZHAO

Institutions: Chinese Academy of Agricultural Sciences, Ministry of Agriculture and Rural Affairs, Institute of Crop Sciences

Language: English

Topic: Rice Cultivation and Yield Improvement

Subfield: Plant Science

Field: Agricultural and Biological Sciences

Domain: Life Sciences

SDG: Zero hunger

Open Access status: gold

Estimated APC paid: $941