The relationship between early tillers at low-nodes and leaf morphological characters,carbon and nitrogen metabolism in rice

doi:10.14088/j.cnki.issn0439-8114.2019.21.004

Abstract

Abstract: In order to study early tillers at low-nodes and their association with leaf morphological characters and carbon and nitrogen metabolism, and to screen rice （Oryza sativa L.） varieties （lines） with many tillers at early low-nodes, high tillering rate and the leaf morphology of ideal plant architecture, the tillering characteristics at early low-nodes, seeding leaf morphology and carbon and nitrogen metabolism indexes in 31 indica rice varieties （lines） were studied by correlation analysis and cluster analysis. The results showed that under general cultivation conditions, the tillering rate of the first node in different rice varieties （lines） showed extensive variation, while the tillering rate of the second and third node reached 100%. The occurrence rate of tillers at low-nodes in rice was positively correlated with seeding leaf length, and tiller number was negatively correlated with leaf width. Therefore, in breeding, the first three leaves of rice seedlings which are longer and narrower can be used as morphological reference indexs for selecting rice varieties with early tillers. The sucrose content in rice seeding affected only the occurrence rate of tillers, but not affected tiller number. Nitrate content affected not only the occurrence rate of tillers, but also the tillering rate. The activity of nitrogen metabolic enzymes such as glutamate synthase （NADG-GOGAT） and glutamate dehydrogenase （NADG-GDH） could promote the formation of tillers at low-nodes in rice. The rice varieties（lines） investigated in the current study were clustered into three categories： classes A, B and C. Among them, materials in class C were high-quality breeding materials with early tillers, fast occurrence rate of tiller, and leaf morphology closer to that of ideal plant architecture.

Key words: rice （Oryza sativa L.）, low-node tillers, early tillers, leaf morphological characters, carbon and nitrogen metabolism

CLC Number:

S511

TU Wen, AN Qi, HE Yong-gang, LIU Shao-jia, CAI Hai-ya, ZHANG Zhi-hong. The relationship between early tillers at low-nodes and leaf morphological characters,carbon and nitrogen metabolism in rice[J]. HUBEI AGRICULTURAL SCIENCES, 2019, 58(21): 22-29.

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