期刊
JOURNAL OF PLANT GROWTH REGULATION
卷 41, 期 4, 页码 1714-1725出版社
SPRINGER
DOI: 10.1007/s00344-021-10414-2
关键词
Abiotic stress; Grafting; Nitrogen metabolism; Photosynthesis
资金
- National Natural Science Foundation of China [32002025]
- Major Scientific Innovation Project of Shandong Province [2019JZZY010715, 2019JZZY010707]
This study found that under low-nitrogen stress, tomato plants grafted onto high-nitrogen efficient rootstock exhibited enhanced growth but reduced photosynthetic efficiency, while showing improved nitrogen absorption and utilization, leading to reduced root damage caused by excessive accumulation of ammonium-nitrogen.
Nitrogen is an essential macronutrient required for plant growth. In this study, the relationships between plant growth, photosynthetic capability, chlorophyll fluorescence characteristics and nitrogen forms in response to low-nitrogen stress were studied in tomato grafted with different nitrogen-use-efficiency tomato seedlings. Using tomato plants grafted with different rootstocks, we found that, under low-nitrogen stress, plant growth, chlorophyll contents, net photosynthetic rate (Pn), maximal photochemical efficiency (F-v/F-m), the total nitrogen (TN) concentration, and nitrate reductase (NR) activity were significantly inhibited but that the ammonium-nitrogen (NH4+-N) content in the roots significantly increased. High-nitrogen-use-efficiency tomato grafted plants exhibited significantly enhanced plant growth but reduced Pn, F-v/F-m, TN content and NR activity under low-nitrogen conditions compared to the grafted seedlings of the low-nitrogen-use-efficiency genotype. In addition, tomato plants grafted onto high-nitrogen efficient rootstock presented reduced damage caused by excessive accumulation of NH4+-N in the roots under low-nitrogen stress. Our results indicate that tomato plants grafted onto high-nitrogen efficient rootstock presented enhanced absorption and utilization of nitrogen and maintained growth by promoting the use efficiency of light energy under low-nitrogen stress.
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